The new secret schematics vault is here! Click any of the quick links below to access area of interest:
Alarms and security related schematics
Audio power amplifiers
Audio preamplifiers
Automative and car related schematics
Data acquisition and data logging schematics
Filter schematics
Games and fun stuff (schematics)
Infrared based schematics
Laser related power supplies and data transmission
LED related schematics
Lighting schematics
Medical and health related schematics
Microcontroller based schematics
Misc audio (also see Music, Amplifiers, Preamp)
Miscellaneous schematics
Model and remote control schematics
Motor and general control schematics
Music related schematics (also see Audio)
PC related schematics
PDA interfaces and related schematics
Power supplies and control schematics
Radio-frequency schematics (also see Transmitters)
Solar-powered schematics
Telephone and intercom related schematics
Test equipment schematics
Timing, oscillators etc. (schematics)
Miscelaneous schematics
Transmitter schematics
Video related schematics
Direct links to schematics are listed below, just click to access the project and please [let us know] if there’s a broken link, also feel free to discuss any projects in our [forum]. Have fun!
Alarms and security related schematics
- Electronic door codelock (PIC16F84)
- Ultrasonic remote control & alarm system
- Wire loop alarm
Professional 15W to 100W FM transmitter/exciter board; STMAX3015+
- Door knob alarm (PDF)
- Water seepage alarm (PDF)
- Micro-power over temperature alarm (PDF)
- A Basic RF Transmitter for PIR Sensors
- PIR motion detector
- Simple alarm system
- Home security project
Back to top or discuss these alarm and security related schematics in our [forum]
-
15W to 100W FM transmitter with DSP stereo and RDS - 8 watt audio amp
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
- 20W Amplifier
- 50W Amplifier
- Push-Pull Class A Amp using type 5687 dual triodes
- Push-Pull Class A 2A3 Stereo Amp
- Single Ended Class A2 SV811-10 Stereo Amp
- Audio amplifier output relay delay
- Spatial Distortion Reduction Headphone Amp
- HeadBanger Headphone Am
- 50W audio power amplifier
- Bi-Directional 2.4 GHz One Watt Amplifier
- Bi-Directional 900Mhz One Watt Amplifier
- 20 Watt GaAaFET Power on 2.3 GHz
- 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
- 2.3 GHz Power Amplifiers
- 2304 and 3456 MHz Power Amplifiers
BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.
Back to top or discuss these amplifier related schematics in our [forum]
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Low impedance microphone amplifier
- Dynamic microphone preamplifier
- Tube microphone preamp
- Simple Stereo Electret Microphone Preamplifier
- Phono Preamp
- Simple microphone preamplifier
- Balanced microphone preamp
- Audio preamp
- Vacuum Tube Microphone Preamp
- FET Preamp Cable
Back to top or discuss these preamplifier related schematics in our [forum]
- Grand Cherokee Off-Highway Lights
- Engine control unit schematics
- Portable CD Player Adapter For Car
- Car battery charger
- Wireless Auto Tachometer
- Simple car battery charger
- Parking sonar
15W to 100W FM transmitter with DSP stereo and RDS
- 80188XL Engine Tachometer
- FCD (Fuel Cut Defencer)
- Interface between GM’s 5 Volt 8192 baud ALDL data stream and a PC serial port
- 5301 wideband fuel mixture display
- Wide Band Fuel Mixture Display
Back to top or discuss these automotive, car and motorcycle related schematics in our [forum]
- Rain detector
- Home Brew Compass Sensor
- ADC0804LCN 8-bit A/D converter
- Honey Bee counter (PDF)
- Capacitance type liquid level measurement (PDF)
- Thermostat node schematic
- Ultrasonic Range & Imager
- Precision Digital Altimeter
- Digital compass schematic
- Temperature datalogger
- Serial Port A/D-converter
- Centronics port D/A converters and low-pass filter
Professional 15W to 100W FM transmitter/exciter board; STMAX3015+
- Accelerometer Schematic
Back to top or discuss these data acquisition and data logging schematics in our [forum]
- 3KHz low-pass filter plus audio amp (PDF)
- Active bandpass filters
- Bandpass filter
- Narrow band audio bandpass filter
- DC Accurate, Active RC Lowpass Filter
- Chebyshev / Butterworth filters
- Biquad Active Bandpass Filter Schematic
- Digital signal processor (DSP) for radio communications
- 29.85 MHZ bandpass filter schematic
- 29.85 MHZ notch filter schematic
Back to top or discuss these filter schematics in our [forum]
- Visor cradle serial interface
- VCR ping pong game
- Video ping pong game
BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.
- Dreamcast PC serial adapter
- Pine Racecar Victory Judge
- Interfacing Sony control stick to Empeg
- GameBoy Schematic
- GameBoy LCD schematic
- GameBoy Power & Cartridge schematic
- GameBoy ROM+RAM+MBC1 Cart Schematic
- GameBoy MBC1 circuit equivalent
- Super GameBoy schematic
- Dreamcast interface
- Bingo!!! (on your tv)
- Slot car TV cronograph
- Sanyo 20EZ monitor Arcade Game (300k ZIP)
- Burger Time Arcade Game (500k ZIP)
- Dig Dug Arcade Game (800k ZIP)
- Frogger Arcade Game (500k ZIP)
- Galaga Arcade Game (542k ZIP)
- Gyrus Arcade Game (800k ZIP)
- Junior Pacman Arcade Game (400k)
- Ladybug Arcade Game (335k ZIP)
- Mappy Arcade Game (470k ZIP)
- Moon Cresta Arcade Game (300k ZIP)
- Mr.Do Arcade Game (554k ZIP)
- PacLand Arcade Game (316k ZIP)
- Pengo Arcade Game (313k ZIP)
- Q*Bert Arcade Game (600k ZIP)
- Qix Arcade Game (476k ZIP)
- Scramble Arcade Game (600k ZIP)
- Time Pilot’84 Arcade Game (870k ZIP)
- Xevious Arcade Game (450k ZIP)
- DIT shutterglasses controller
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Lego Mindstorms Double Rotation Sensor
Back to top or discuss these games and fun schematics in our [forum]
- Infrared gate for door
- Infrared circuits for remote control
- Serial port controller infrared transmitter (PIC16F628)
- IR remote control
- 40KHz light receiver (PDF)
- 40KHz TV-VCR repeater (PDF)
- Infrared Transmitter and Receiver schematic diagrams
- Pyroelectric Infrared Sensor
- Minimal Infrared transmitter for PC
- Simple IR transmitter circuit
- Simple infra-red detector
- Fire-Stick infrared remote control
- Simple infrared remote control
- IR detector for robotics
- Computerized Infrared Remote
Back to top or discuss these IR related schematics in our [forum]
- Laser power supply
- Laser transmitter/receiver
- 20MHz VCSEL 3mW laser test circuit (PDF)
- 10MHz to 20MHz laser light detector (PDF)
- Micro-power 40KHz burst laser diode driver (PDF)
- 40KHz laser burst detector (PDF)
- Modulated laser diode tester (PDF)
- RS-232 Laser Transceiver
- HeNe laser power supply
- Diode Laser Power Supplies
- Laser bug circuit
- RS-232 Laser Transceiver
- Experimental laser data link
- Ar/Kr Ion Laser Power Supply Design
- Simple laser communicator
Back to top or discuss laser related power supplies and data transmission schematics in our [forum]
- Color fade
- LEDs shimmer randomly as though on fire
- LED power supplies for AA cells
- LED chaser
- 7 Segment LED Counter
- 1.5V LED flasher B (PDF)
- Low current LED flasher (PDF)
- 1.5V LED flasher A (PDF)
- Flashing LED advertising badge (PDF)
- Pulsed LED test circuit (PDF)
- Low battery voltage flasher (PDF)
- PWM white LED drivers
- Heart of LEDs
- Christmas Star
Professional 15W to 100W FM transmitter/exciter board; STMAX3015+
- Christmas tree
- White LED circuits
- Assorted LED circuits
- LED Mood Light
Back to top or discuss LED related schematics in our [forum]
Lighting schematics - Digital timer light switch
- Hand clap lamp control
- Radio controlled light switch
- TRIAC light dimmer
- 12VDC Fluorescent Lamp Driver
- Strobe light
- Adjustable Strobe Light
- 5W Fluorescent light intensity modulator (PDF)
- 1W Fluorescent lamp night light (PDF)
- Low-voltage light dimmer
- Light chaser
- 4-channel dimmer rack
- Disco light controller
- Neon lamp dimmer
- LED Mood Light
Back to top or discuss lighting related schematics in our [forum]
- Snore alarm electronic device
-
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Simple lie detector
- Cardiac monitor
- Brain-Wave Machine
- Lie detector
- Simple lie detector
- Respiration system
Back to top or discuss medical and health related schematics in our [forum]
- PIC based packet radio encoder (PDF)
- PIC16F84 CW decoder (PDF)
-
BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.
- PIC16F84 line following robot
- PIC16C505 IR / wireless remote control
- Automatic door opener with PIC12C508
- RS485-like multi-drop bus with half duplex serial protocol
- 50 MHz frequency counter, voltage meter & SWR/PWR indicator
- Programmer PIC16F84,12C50x and EEPROM 24Cxx
- RDS Encoder – digital part
- PIXpand
- 90S2313 AVR Robot Board
- POCSAG encoder/decoder
- Serial to parallel converter using the AT89C2051
- AT89C2051 serial COMs to LED driver
- DS1820 Arbiter V2.00 Schematic
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Microchip PIC ICSP implementation
- MMC to PIC16F876 circuit diagram
- 8088 maximum mode SBC
- EZ80 single board computer schematic (Z80)
- 8051 Development System Circuit Board
- Long-period watchdog timer
- PIC ICD
- PIC Project #1 – RS232 to I2C Interface
- Galvanic decoupling of I2C bus
- Programmer PIC16F84,12C50x and EEPROM 24Cxx
- Dual PIC16C84 prototype board
- Graphic LCD interface
- FSK modem with PIC16C84
- Talking YODA project (PIC16C84)
- PIC16F84/PIC16F87x-In-System-Programmer
- Microcontroller interface for 5KW microwave oven
- Using an I2C Serial EEPROM with a Basic Stamp 2
- PIC16F84 Based Morse Code Reader
- AVR-Based Serial Port IR Receiver
- Victoria TAFE programmer (based on AT89C2051)
- JDM programmer
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- PIC micro programmer
- Speech recognition using HM2007
- PIC microcontroller servo motor interface
- PIC micro multiple servo motor interface
- Way small web server
- GPS LCD Display Project
- PIC16F84 LED chaser
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
- PIC micro LED projects
- PS/2 keyboard keystroke logger based on Atmel 89C2051
- Microcontroller sensor and actuator interfaces
- Giant money counter (PIC16F876)
- PIC12C509 logic gate replacement for nitrogen filler
- PIC demo board
- PIC12C509 Gym Timer
- PIC LCD and Keypad driver
- PIC12C508 Phase Controller for 2kW heater
- PIC16F84 TRIAC / IGBT brightness phase controller
- PIC16F84 pulse monitor with date/time output (ZIP)
- PIC micro to ISA bus interface
- Microchip PIC ICD (in-circuit debugger)
- Tony Nixons Pocket Programmer (PIC)
- PicoWeb V5.1 (AT90S8515) tiny web server
- Atmel 89C2051 In-Circuit Programmer Schematic
- 8051 Development System Circuit Board
- Microprocessor using Xilinx FPGA
- I2C LCD interface
- AFSK 1200 Modem based on PIC16C620
- PicCon – Hidden Radio Transmitter Controller
- PIC16F84 tone generator with source code
- PIC16F84 tone generator
- PIC16F84 tone generator (6-Bit)
- AVR Beacon Super Keyer
- AVR Frequency Counter
- AVR Digital Voltmeter
- AVR Signal Generator
- 2-wire LCD interface using PIC16CF84
- PIC16F84 Serial I/O-expander with PicBasic
- RS 485-RPT Schematic
- Camera remote control system using Basic Stamp
- Low cost Atmel in-system programmer
- Ultra low-cost programmer for AT90S family
- Connecting AT90S2313 with LCD display 2×16 char and 4×4 keypad
- Electronic safety lock based on ATtiny26
- 128×64 LCD Driver for AT90S2313 (ZIP file)
- Connecting LED to PIC Micro I/O pins (PDF)
- Microprocessor RS-232 Reset
- AT90S8515 experimenter board
15W to 100W FM transmitter with DSP stereo and RDS
- PIC programmers for parallel port
- Wisp628 ISP Microchip PIC Programmer
- WLoader – PIC16F877 application loader / bootloader
- Nixie clock (PIC16F876)
- Multi-chip programmer
Back to top or discuss microcontroller related schematics in our [forum]
Various audio schematics (also see Music, Amplifiers, Preamp)
- 1.5V Audio Amplifier
- Six-channel Mixer and Amplifier
- Audio Signal Source
- Voltage controlled amplifier
- Audio graphic equaliser
- Intercom preamp
- FET audio mixer
- Microphone mixer
- Tone control
- Digital volume control
- Sound level meter
-
Professional 15W to 100W FM transmitter/exciter board; STMAX3015+
- Very loud beeper (PDF)
- Digital noise generator (PDF)
- Tone display system
- Tube amplifier
- Various tube crossover circuits
- Audio line isolator
- Dynamic microphone to electret microphone input
- Line level signal to microphone input adapter
- Simple two line output combiner
- Electret microphone powering circuits
- Use amplifier phono input as line level input
- Speaker signals to line level inputs
-
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
- Microphone phantom power supply
- RIAA Equalized Stereo Phono Preamp
- Tube active crossover
- Voltage Controlled Panner
-
BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.
-
Back to top or discuss audio related schematics in our [forum]
- Chaos generator
- Full-duplex doorphone with 3 wires connection
- G Strain energy absorber
- Biasing Op-Amps into Class A
- Random noise generator
- Analog pulse counter
- Analog opto-isolator
- Pulse width modulators (PWM)
- Pulse width to voltage converter
- Fantastic Atom Expander
- Black Light
- Computerize Your Room/Home
- Flash slave trigger
- Magnetic levitation device
- Tesla power receiver
- Lazer Tag Equipment Modifications
- Inexpensive APRS Weather Station
- Basic op-amp circuits
- Ion detector
- 1uS light pulse descriminator plus F to V converter (PDF)
- Broadband 2MHz optical fiber receiver (PDF)
- Modulated light received (PDF)
- 1uS light pulse receiver plus post amp (MISC)
- Broadband 5MHz optical fiber receiver (PDF)
- High-speed light receiver (PDF)
- Basement doorbell beeper (PDF)
- Time to dust indicator (PDF)
- Low-power optical interrupter (PDF)
- Simple nitrogen spark generator (PDF)
- Bat detector (new)
- Vat detector (old)
- Variety of quick designs
- Gold wafer (smartcard) programmer
- Making a FRED photopopper
- GPS receiver support kit
- Griffith Observatory Tesla Coil
- Fogger smoke machine
- Dinsmore 1490 digital compass
- Geiger counter
- Electric field disturbance monitor
- Inexpensive seismometer project
- Popular Electronics Ultrasound Detector
- An Inexpensive X-ray Machine
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Navigator 555A radio direction finder (RDF) circuit diagram
- u-Blox GPS receiver board
- Assorted digital circuits
- Basic electronic circuits
- Miscellaneous simple circuits
- Digital Call Sign Annunciator
- Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator
- Common Ground for Older VPW Circuit
- Bat detector
- FCTS Project
- Smooth Tone Clickless CW Sidetone Generator
- Morse Code Beacon Keyer
- Lightning Activated Camera Shutter Trigger
- Simple metal detector electronic circuit
Back to top or discuss these schematics in our [forum]
- Model Rocket with Video Camera
- Signal breaking module
- PIC based rocket altimeter
- Robot with PIC16F84 brain & InfraRed eyes
- 0-10V control for RC servos
- Pad launch controller for model rockets
- Simple flashing light circuit
- A dual alternating flashing light circuit
- Simple flashing light circuit
- A dual tandem flashing light circuit powered by a 9 volt battery
- Simulate the Gyralite (dual flashing headlights).
- Simple train detector using ambient light and a photocell
-
Professional 15W to 100W FM transmitter/exciter board; STMAX3015+ - R/C digital camera controller
- R/C helicopter camera
- Building an RF Remote Control System
- Motor walker circuit
Back to top or discuss model and RC schematics in our [forum] - Bridge head
- PWM motor controller
- Simple 10 Stage Control Box
- Ceiling fan speed control
- Delayed off light switch
- Deoderizer fan timer
- Current loop interface
- Light/dark detector
- Pulse Width Modulation DC Motor Control
- Stepper motor controller
- Touch switch
- Pushbutton one-shot and latch (PDF)
- Charge coupled bi-directional power MOSFET relay (PDF)
- Finger touch activated switch (PDF)
- Machine vibration triggers hour meter (PDF)
- Solid state relay (PDF)
- Line-powered Xenon flash transmitter (PDF)
- 9V Xenon photoflash controller (PDF)
- Combination-controlled, fully customizable RF remote control
- Thermoelectic controller (scriptable thermometer)
- Stepper motor positioner
15W to 100W FM transmitter with DSP stereo and RDS
- DS1821 programmable thermostat
- LDR light/dark activated relay switch
- Touch Switches
- 6090 digital decoder schematics
- Assorted relay control circuits
- Serial servo controller
- DC Motor-Driver H-Bridge Circuit
- PWM Motor Speed Controller / DC Light Dimmer
- Constant Temperature Circuit
- PWM DC Motor Speed Control
- CO2 controller for planted tanks
Back to top or discuss motor and control schematics in our [forum]
- Peak-reading meters
- Octave screamer
- Colour organ light
- MP3 Player
- Simple colour organ
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Guitar fuzz effect
- 8 note tune player
- Colour (Sound) Organ
- Transisor organ
- Zonk Machine and Treble Booster
- Simple line mixer
- Simple MIDI tester
- Spring reverb
- MIDI drum machine project
- MIDI Drum Machine Analog Input Schematic
- Guitar Reverb Pedal
- Midibox 64
Back to top or discuss Music related schematics in our [forum]
- I2C printer port adaptor
- Modem Rockwell RCV336/ACF model V1433VQR ext.
- Genius Mouse schematics
- Commodore 64 24-bit parallel port interface with 8255
- RGB oo Monochrome converter – Matches impedance of PC to CCTV monitor
- PC infrared iRDA interface using TFDS 4500
- Parallel (Printer) Port Interface
- RS-232 line monitor and loopback cables
- The KD2BD Pacsat Modem
- A Serial Infrared Remote Controller
- PC Serial and Parallel Port Software and Interfaces
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
- PC thermometer
- Dive computer interface
- Parallel port servo controller
- GPS receiver (Gamin, Eagle etc) to PC interface cables
- Connect two CD-ROM drives to one soundcard
- Headphone driving circuit for soundcards
- Get power out of PC parallel port
- Null Printer Adapter
- PC speaker volume control circuit
- How to get power from PC to your circuits
- RS-232 surge protection
- Simple RS-232 serial port buffer circuit
- Get power out of PC RS-232 port
- Sound Blaster Microphone Preamplifier
- Sega 3D glass interfacing circuits
- Convert Atari-style joystick to PC joystick port
- Fake Joystick circuit
- Using the joystick port as general purpose input
- Connect other circuits to PC joystick port
- Schematic of a standard PC joystick
- Simple PC SmartCard reader
- Fax to modem interface
- Analog to Digital Conversion (ADC) and Communicating with a PC
- Temperature sensor for PC
- Linux Infra-red Remote Control (LIRC)
- Homebuilt RS232 LCD Interface
- CCD linear image sensor to PC parallel interface
- Laptop Computer Serial Port Power Booster
- Assorted computer interface circuits
- HamComm Interface
- Apple II/II+/IIe IDE Drive Interface
Basic Stamp I & PC Relay Controller
- iRDA printer adapter
- 160 Baud ALDL Hardware Interface
- Digital Signals Decoding Interfaces
Back to top or discuss PC related schematics in our [forum]
- Interfacing ultrasonic range finder to BrainStem
- Hamamatsu UVTron Interface to a BrainStem
- Casio datalogger
- Interfacing ADXL202 accelerometer to PalmPilot
15W to 100W FM transmitter with DSP stereo and RDS
- PalmPilot cradle to modem adapter
- PalmPilot connector pinouts
- PalmPilot serial port interface
- PalmPilot turbo boost guage interface
Back to top or discuss PDA interfaces and related schematics in our [forum]
- Alkaline battery charger
- Alternative power source for Magellan GPS receivers
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- 6V to 12V Converter
- Tesla coil / HV generator
- High Current Power Supply
- Dual Polarity Power Supply
- High Voltage High Current Power Supply
- Transformerless Power Supply
- Fixed Voltage Power Supply
- Voltage Inverter
- Voltage Inverter
- Negative voltage generator
- Power reminder beeper (PDF)
- Unplugged power cord alarm
- Machine power loss beepter (PDF)
- Low-dropout 12V regulator (LM324)
- Bidirectionall power inverter
- High current regulated power supply
- Adjustable power supply using LM317
- Simple +5V power supply circuit
- 12 Vdc – 120 Vac Inverter Schematic
- Simple switching power supply
- Assorted power source and control circuits
- PWM Motor Speed Controller / DC Light Dimmer
- PWM Motor/Light Controller
- Low Power LED Voltmeter
- PWM Motor/Light Controller
- PWM Motor/Light Controller variants
- Low Power LED Voltmeter
- Temperature Controlled NICD Charger
- Battery Charger Ideas
- 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
Back to top or discuss Power supplies and control schematics in our [forum]
- TRF AM Receiver circuit
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
- WLW 500KW Transmitter Schematic
- AM-Receiver for Aircraft communication (118.250MHz)
- AM receiver for aircraft communications
- 45-860MHz Radio receiver based on UV916-tuner
- Superregenerative 27MHz receiver
- Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
- RF front-end for triple conversion GPS receiver
15W to 100W FM transmitter with DSP stereo and RDS
- Crystal radio
- Op-Amp Radio
- Crystal set that requires no antenna
BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.
- Advanced VHF power meter
- The MRX-40 Mini Receiver
- 175KHz inductive pulse receiver (PDF)
- 200-400 MHz voltage controlled oscillator
- AM BCB radio receiver
- Regenerative shortwave receiver
- 7MHz SSB Transceiver
- Frequency Synthesizer
- Digital Automatic Gain Control (AGC)
Professional 15W to 100W FM transmitter/exciter board; STMAX3015+
- 2N2222 40 Meter CW/DSB Transceiver
- 30M PSK31 Transceiver
- SOP receiver (PDF)
- SOP direct conversion receiver
- Receiver
- 40m direct conversion receiver
- 80m direct conversion receiver
- Huge LED Antenna Direction Display (part 1)
- Huge LED Antenna Direction Display (part 2)
- 136 kHz direct conversion receiver
- One Watt 2.45 GHz Linear Amplifier
- 222 MHz Transverter
- VFO from 2001 ARRL Handbook, page 17.74
- VFO from 2001 ARRL Handbook, page 14.20
- Assorted RF circuits
- 14MHz SSB 10mW Transceiver
- Building a Simple LF Exciter
- Yaesu band decoder schematic
- 5 watt, 80 meter QRP CW Transceiver
- How to Build a 300MHz AM, RF Remote Control System
- ICOM CI-V interface with RS232 RTS to PTT
- Improved FM Stereo Modulator
- Smooth Tone Clickless CW Sidetone Generator
- Crystal radio circuits including diode performance comparison
- 56K RF Modem
Back to top or discuss Radio-frequency schematics in our [forum]
- Portable solar battery charger
- Sensor Electronic Tracker with H-Bridge Drive
- Sensor Electronic Tracker with Simple Solar Charge Controller
- Solar tracking control system
- LED7 solar tracker
- Solar step-down regulator
- Zener-based solar engine
- AA battery solar charger
- AA battery solar charger
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit
- Solar Panel Current Meter
- SCC2 10 Amp Solar Charge Controller
- Solar Charged LED Flashlight
- AA battery solar charger
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit
- Solar Panel Current Meter
- Back to top or discuss Solar-powered schematics in our [forum]
Telephone and intercom related schematics
- Home made PBX / PABX
- Ringing Phone Light Flasher
- Phone Busy Indicator
- FM Telephone Bug
- Cut Phone Line Detector
- Simple Phone Tap
- Telephone Hold Button
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Telephone Recorder
- 300 baud modem circuit schematic
- 1-line telephone status indicator (PDF)
- Line in use indicator (PDF)
- 4-line telephone status indicator (PDF)
- FM telephone bug
- Universal telephone hold
- Talking phone dial monitor
- Telephone privacy adapter
- Telephone ringing circuits
- Simple circuit to connect telephone equipment to audio mixer
- NCDS Interface Schematic for Nokia 3110, 8110, 8110i
- Assorted telephone circuits
- Greek telecard reader
- Telephone autodialler
Back to top or discuss Telephone and intercom related schematics in our [forum]
- Frequency counter
- 220V live wire-in-wall scanner
- Automatic stud detector
- Capacitance meter
- Capacitance meter
- Electric field & leakage detector
- Simple polarity detector
- RCM710 Electronic Scale
- Simple pH meter
- Temperature compensated pH meter
- pH meter with calibration
- LASER/LED light output intensity meter (PDF)
- Resistor decade box
- Simple light sensor adapter for oscilloscope
- Time Domain Reflectometer (TDR)
- LCD frequency counter (PIC16F84)
- Pulse Reading Logic Probe
-
15W to 100W FM transmitter with DSP stereo and RDS
- 120MHz frequency counter
- Capacitance meter that connects to multimeter
- Transistor tester and signal injector
- Continuity tester
- Square wave oscillator (555)
- Build a Magnetic Field Immunity Tester
- Field strength meter for the 137 kHz band
- PIC logic probe with pulser
Back to top or discuss Test equipment schematics in our [forum]
- DDS using AD9835
- Time Delay Relay
- Time Delay Relay
- Line powered 60Hz clock generator (PDF)
- Micro-power pulse generator (PDF)
- Darkroom camera shutter timer
- Divide by 1.5 counter (PFD)
- High-output square wave generator (PDF)
- D Flip-flot one-shot circuits (PDF)
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable
- Day / Night / 24 Hour Select Sensor
- One transistor timer
- Variable timer
- Micropower pulse generator (PDF)
- High Precision GPS/TV controlled Reference Oscillator
- TV based Receiver for a Standard Frequency Generator
- AD9852 DDS schematic
- Monostable multivibrator
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- Li’l 7 AM Transmitter Schematic
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PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
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- Video Clock Superimposer
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Professional 15W to 100W FM transmitter/exciter board; STMAX3015+
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MORE STUFF COMING, CHECK THIS SPACE OFTEN!
15W to 100W FM transmitter with DSP stereo and RDS
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…
Motor and general control schematics
BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.
15W to 100W FM transmitter with DSP stereo and RDS
PC FM transmitter card for your PC
Insert this into your PC (PCI slot) and turn your PC into a local radio station. Play music to your community, start your own small FM radio station, also great for outdoor cinema, advertising, realltor radio, convenient wireless translation, guided tours…