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IV+ zener diode question...MARKO!! HELP!!!

 
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IV+ zener diode question...MARKO!! HELP!!!
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Joined: 25 Mar 2006
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Post IV+ zener diode question...MARKO!! HELP!!! Reply with quote
MARKO

At least it always used to be Marko who was so helpful there. I just now finally got around to assembling MAX IV+. It was ordered a while ago and might have been one of the first to ship. There were a few part substitutions, no big deal and I figured them all out, but I want to check on this last one. The bill of materials specifies D2 as 12V Zener and D3 as 11V Zener. I received a 9.1 and an 11 (C9V1PH and C11PH). Part of me is guessing that these parts just set up a reference difference and I should just put the higher voltage in D2 position (D2=11V, D3=9.1V). But another part of me wonders if the C9V1PH just got in the wrong bin by mistake.?????

The only other part substitution I want to check on is that I received a 4MHz xtal in the LCD kit, identical to the one in MAX IV+ kit, instead of 6.4MHz as in instructions for LCD...problem?????

Last question. I broke thermistor R38 (NTC 33k) trying to move it closer to the heat sink, stupid, I know, I have to order new part by mail and it will be a couple weeks and I don't want to wait to test MAX IV+. Can I substitute a normal 33K resistor temporarily and be careful with heat??

Thanks in advance, you have always been very helpful in the past

Aurora
Sun Mar 26, 2006 12:12 am View user's profile Send private message
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Post Reply with quote
You're right with zener diode.
Quartz is ok too, no problem there.

Regarding the NTC resistor, replace with ordinary resistor,
but you'll loose temperature protection.

Bolt the heatsink to the metal enclosure to dissipate heat!

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Sun Mar 26, 2006 1:57 am View user's profile Send private message Visit poster's website
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Post Reply with quote
YES!!!

Marko, you are a rock star!

It,s Saturday man...Don't they give you weekends off in Slovenia?

OK, so the 9.1V goes in the 11V spot and the 11V goes in the 12V spot. This sets up a 1.9V reference which ends up having something to do with the voltage applied that controls output power. Oh, for the days of MAX1 when you printed schematics. By the way, very well done on MAX PRO IV+. If it does what you say (I should know in a few minutes now) it truly is a worthy sucsessor to PRO 1, of which I have built several.

Thanks again Marko, best customer support in the world!

Aurora
Sun Mar 26, 2006 2:12 am View user's profile Send private message
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ad wrote:
It,s Saturday man...Don't they give you weekends off in Slovenia?


Marko works too much.

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Wed Mar 29, 2006 12:19 am View user's profile Send private message Visit poster's website
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