[sdiy] Critique my gate output buffer?

[Chris McDowell]

oh your resistor to ground after the diode is 22k, why so low? I guess your feedback resistor in the loop makes this not matter. For some reason this all feels fussy ¯\_(ツ)_/¯ 

Cheers,
Chris 

> On Nov 25, 2024, at 11:20 AM, Chris McDowell <declareupdate at gmail.com> wrote:
> 
> This is like swapping your output resistor with a diode, which means your capacitive load is only, yknow, capacitively loading when the diode is conducting. I don't think there is a lot of value in putting the output resistor in the feedback loop for gate outputs, as we'd usually do that to increase DC accuracy at the receiving equipment. I would move your output resistor out of the feedback loop to take stability out of the conversation. You then have something pretty normal that will OR with similar outputs, up to some limit where all your 100ks (and whatever all the various input resistances) in parallel are too low a resistance to get your gates across. that's a lot, though. 
> 
> Cheers,
> Chris 
> 
>>> On Nov 24, 2024, at 12:42 PM, Paul Glass-Steel via Synth-diy <synth-diy at synth-diy.org> wrote:
>>> 
>> 
>> I'm hoping to improve on the typical transistor emitter-follower, wire-OR capable gate output buffer that many of my modules have inherited from CGS and NLC. I've come up with this: https://tinyurl.com/259pt83t - it seems happy on my bench, the voltage is stable under a lot of fan-out to multiple inputs and it seems ok with long cables / capacitive loads. But I thought I'd check here to see if I'm missing something.
>> 
>> Thanks,
>> -Paul
>> 
>> 
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