That1580 mini mixer

Where we discuss new analog design ideas for Pro Audio and modern spins on vintage ones.
weroflu
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Joined: Wed Apr 19, 2017 9:19 am

Re: That1580 mini mixer

Post by weroflu »

Yes I looked at the 626x a few times. Most recently I didn't like the low-ish gain, no servo and, worse distortion figures on the preamp than the 1580. Thinking about it now, I could fit 2 470uF 10v cg's on a preamp card since I would only need 2 or 3 cards, 39/34 db gain is probably ok, but maybe with some dynamics mics maybe not. Distortion figures, not sure if that's audible, but I do really like the lme49720 op amps and probably because of their low distortion.

I was almost going to post a few weeks ago and ask you about how to do a differential servo for it.
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mediatechnology
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Re: That1580 mini mixer

Post by mediatechnology »

It looks like you'd have to servo into the input bases since one emitter has Rg in series.
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mediatechnology
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Re: That1580 mini mixer

Post by mediatechnology »

I think this may be relevant:

"Analog And Digital Gain In Microphone Preamplifier Design," Fink And Bortoni, THAT Corporation, Presented at the 153rd Convention
2022 October.

https://proaudiodesignforum.com/images/ ... T_Corp.pdf
weroflu
Posts: 55
Joined: Wed Apr 19, 2017 9:19 am

Re: That1580 mini mixer

Post by weroflu »

thanks for the link. read it and thinking on it.

for now it's not high priority as i'm still working on getting signal digitized.

just sent board order for revised adc, clock and mcu

fingers crossed things will start to work after this.

future versions might involve 626x to simplify things
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