Schematics

The secret schematics vault is here

Click any of the quick-links below to access area of interest:
FM TRANSMITTER SCHEMATICS

AM TRANSMITTER SCHEMATICS

FM TRANSMITTER VCO (Voltage controled oscillator) SCHEMATICS

FM TRANSMITTER AMPLIFIER SCHEMATICS

STEREO ENCODER SCHEMATICS

LIMITER SCHEMATICS

STL SCHEMATICS – studio transmitter links

RDS ENCODER SCHEMATICS

MISC. SCHEMATICS

DATASHEETS

SCHEMATICS AND USABLE DATASHEETS

Schematics – Fm transmitters
World’s simplest FM transmitter schematic, period.
If you cannot assemble this transmitter, then perhaps you should give up on assembling anything at all;-) Range and stability generally suck, but it works! Its a demonstration of what can be done with little to none resources. Please, don’t bother asking how you could increase the power of this small FM transmitter.

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

1W PLL FM transmitter schematic
Cool little FM transmitter. Suitable for study purposes, you can use the RF part of this transmitter easily for your projects. However, unless you know how to build a serial data link and connect this LPFM transmitter to a PC or a microcontroller, you won’t be able to use the PLL. All info about the PLL is available at Plessey’s web page.

2W FM transmitter schematic
This is a bit more complicated transmitter, but gives a mile of range or so. You have to understand that it radiates god knows where, you will be making a lot of interference! This is probably the simplest 2W FM transmitter out there. Keep those two transistors cool, they can die quickly in this circuit. Don’t forget that there is no such thing as a free lunch, stability and spectral purity suck. But range is significant (watch those feds).

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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…

Modified 2m VCO/PLL
This used to be a 144MHz FM transmitter, but it can be modified for FM broadcasting. Here are the VCO, the PLL and the block diagram. Don’t ask if you don’t know what to do with those, this is for someone who knows a bit about basics.

FET FM transmitter schematic
This FM transmitter makes for a nice project. No PLL, but stability is excellent. Does have spectral purity problems, though’. An additional filter is recommended. Giving some 400-1000mW.

Small FM bug
Small and simple FM transmitter. Low cost low quality bug.

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

FM PLL transmitter schematic from BiasComms

Another simple small FM transmitter schematic

FM receiver with TDA7000

Turn your PC (monitor) into an AM radio transmitter
Only works in Linux, but you can actually play an MP3 on your PC and hear it on radio without any extra hardware!!

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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…

NEW: World’s simplest FM transmitter II, upgraded!
many of you out there complained 7413 is not easy to come by. We have revised the world’s simplest FM transmitter to use new, easily available parts. This design is also better as far as stability and output power goes. Enjoy this small and easy to assemble FM transmitter! Keep us posted, post your results in the forum!

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Schematics – AM transmitters
Small AM bug
Small and simple AM transmitter.

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Schematics – FM VCO designs
VCO I
This is a very cool VCO of professional FM transmitter. I am sure the design itself gives some ideas to you as how to design VCOs.

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

VCO II
Another VCO. It is originally made for 2m station, but is perfect for FM radio band as well. The mosfet serves as PLL mixer. If you want to use direct synthesis method, change this mosfet into buffer. Very clean signal, but it is narrow band. It has to be tuned every time you change frequency.

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Schematics – FM amplifiers
Amplifier I
Hook this one to any above VCO and voila, you have a 4W FM LPFM transmitter.

General purpose amplifiers
This is a link to another page that contains detailed instructions for an amplifiers as well as a couple of other interesting designs from Motorola.

C class amplifier
RF amplifier, usable for FM radio and other applications. It is NOT suitable for AM.

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Schematics – Stereo encoders
Stereo encoder I
From Internet, it has been circulating around for ages.

Stereo encoder II
…another cool stereo encoder schematic. Looks better than the above model. It has a bit of noise, filtering is not sufficient, but otherwise it can be made to work extremely nicely. Substitute XR2208!
Cyber Max 15W

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BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.

Stereo encoder III
Yet another cool stereo encoder schematic. What can I say, it definitely works as I have tried it out. Has some hard to find parts.

Stereo encoder IV from BiasComms
Another simple and working stereo encoder from Bias Comm, a nice one…

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Schematics – Limiters
Stereo limiter I from BiasComms
From Inet, its been circuling around for ages.

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Schematics – Wireless links (STL)
24 cm PLL FM link transmitter
From Elektor, you might be able to get this think working as a STL. Its a good starting point…

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Click to learn more!
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…

Schematics – RDS encoders
RDS encoder from Internet
From Inet, its been circuling around for ages. I made it a little bit more readable for you guys.

And the required program
This is the program that’s supposed to be used with RDS encoder, but It doesn’t work on my PC. Supposedly it works on older machines. A fix exists on the internet so look around or ask in the forum.

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Schematics – Miscelaneous
Pirate radio survival guide
This file is a MUST READ for every radio operator or a wannabe.

Aircraft receiver
Receiver for aircraft radios. Very simple.

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

Surprise

Audio scrambler
Audio scrambler, Inverts audio spectrum.

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

April 1st
April first electronic gadgets.

FM receiver preamplifier
Preamplifier for your FM radio.

CB Rogerbeep
Simply world’s best roger BIP for CB stations and here is how to hook it up. Plays 4 Mono wav files from EPROM. Email me for PCB.

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

Walkie talkie
Second version of walkie talkie.

Electronic BELL
Probably one of the best electronics bells. Plays 2 mono 8bit wav files, stored in EPROM. Email to order PCB, we may have a few left.

Muscle trainer
Transforms 9V into 230V small current signal that can be used to stimulate your muscles (be carefull, could be dangerous).

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BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.

Voice scrambler
Makes your voice hard to recognize and sound metallic

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Datasheets – PLL and transistors
MB1504

Various integrated circuits

RF transistors table

Various transistors table

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Schematics – Usable Datasheets
Phillips varicap diodes (BB)
This file is a MUST READ for every radio constructor.

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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…

EEPROMs (used in MAX PRO I)

Atmel uCPU (used in MAX PRO I)

European Telemocommunication Standards

Njm2035

2SC1971

2SC2237

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BLF188XR, ART1K6, ART2K6, BLF184, MRFX1H8 and other hard to find high power RF LDMOS transistors at great prices.

2SC2539

2SC2627

2SC3001

1000W FM transmitter package with antenna and cable
CyberMaxFM+ SE+ V3 1000W FM transmitter package with antenna and coaxial cable

2SC3628

2SC1947

Click to learn more!
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…

BB909A

We will add more schematics periodically, Come back soon!

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