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Show posts MenuQuote from: thesmokingman on July 14, 2019, 06:33:34 PM
looks like the schottky diodes have a Vf between .55 V to .875 V ... you could double those up, go with 2N7000 +bat41 pairs, or 3mm LEDs if you want more volume and less clipping ... of those choices, I think the MOSFET would be smoother and more amp-like
if you want more clipping you could go with 1n400x rectifier diodes, bat41, or germanium ... I think the germanium sound better, even if doubled up for a more reasonable Vf.
now I kinda want to build this thing with mosfet clipping ... damn it, another project
Quote from: m-Kresol on January 22, 2017, 02:13:47 PM
I was feeling like it, so I made a 2 layer pcb for this suitable for 1590a. it's available via oshpark here:
https://oshpark.com/projects/zKa4A1JP
if anyone verifies the layout please let me know.
Quote from: madbean on July 03, 2018, 04:02:06 PM
So, there are a couple mods I did on this circuit to try and squeeze as much gain as possible out of it. But, it seems like I went too far. The two changes are in the first and second gain stages.
To eliminate the problem try reducing R8 from 270k to 220k. If that solves the motorboating stop there. If not, either 1) replace R16 with 150k or 2) change the Gain pot to 100kB and remove (or clip one lead) of R16.
My apologies for the hassle. Please let me know what you find and I will update the build doc accordingly.