[sdiy] SMPTE Time Code Reader—Need Generator

Terry Bowman ka4hjh at gmail.com
Sun Jun 16 00:34:42 CEST 2024


> On Jun 14, 2024, at 8:01 AM, Steve Lenham via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> This online tool will generate WAV files containing timecode to your specification:

Fantastic. Halfway there.

> I used it successfully when developing a hardware timecode display (the modern equivalent of what you've purchased).
> 
The next question is how do I feed the audio into the gadget? Here's what the rear looks like:




What's with that five pin XLR? I assume it's the audio code signal input but what are the other lines for? The switches are power and frame indicator on/off and the auxiliary output is connected directly to some chips on the board.

I'm seeing multiple cathodes lit at once so it may also be the case that the LM74141 (Soviet K155ИД1) Nixie drivers are shot, no surprise there. And I broke a leg off of one of the chips while reseating them so I guess I'll have to scrounge around for a replacement. May have to be 74LS.


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"Would you like to see the relevant data?"—343 Guilty Spark, Halo 2

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