Hi thimios.
All three versions will be shared with layout, silkscreen and mask as soon as I get the printed boards at hand.
Ok thanks
Did you trim it to zero at start? It may need a zobel.
Yes. But it may need a zobel. Oscillations can make your meter go loopy.
I can's say for sure that it will help reduce drift but a couple small heatsinks is always a good idea.
Hi,
Thanks for the update @shaan. Will look forward to the same. V2 is the one with 2pairs of output right ?
Can you please get the PSU boards made as well along with the protection ?? I myself can take 10 odd boards of each,So Am sure there will be others who'd want them just as me.Please do look into it and try and make it happen.
Regards.
Thanks for the update @shaan. Will look forward to the same. V2 is the one with 2pairs of output right ?
Can you please get the PSU boards made as well along with the protection ?? I myself can take 10 odd boards of each,So Am sure there will be others who'd want them just as me.Please do look into it and try and make it happen.
Regards.
Hi SG.
Yes V2 is the dual-FET one. The input cap has been omitted in all three versions btw.
I have prepared a simple PS board that that will have TO220 diode bridge, 2x 10000uF 1.2" diameter caps and 1x 0.1uF per rail, bleeder resistor, 2x supply headers per rail and 4x ground headers on 70micron copper. It doesn't have a speaker protection, yet. Learning how to implement one.
There seems a load of dedicated speaker protection boards available on the net, mostly 1237 based. Do you think these are good?
Yes V2 is the dual-FET one. The input cap has been omitted in all three versions btw.
I have prepared a simple PS board that that will have TO220 diode bridge, 2x 10000uF 1.2" diameter caps and 1x 0.1uF per rail, bleeder resistor, 2x supply headers per rail and 4x ground headers on 70micron copper. It doesn't have a speaker protection, yet.
Learning how to implement one. There seems a load of dedicated speaker protection boards available on the net, mostly 1237 based. Do you think these are good?
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Some measurements of the V1.1 PeeCeeBee. Measured after an 11:1 attenuation from the resistive load.
Pic 1 - 3VPP into 10R.
Pic 2 - 10VPP into 10R.
Pic 3 - 30VPP into 10R.
Pic 4 - Residual distortion of soundcard output.
Pic 5 - Freq. Response from 20Hz to 40KHz.
Notice the first three pics. THD reading showing nearly static distortion of 0.03%. Also notice the noise floor. Now, my PCs 1KHz residual distortion is about 0.014% shown in pic 4. So you do the math.
The cutoff slopes in the freq. response trace is due to my sound-card's internal LF response and sampling rate limit.
Coming next - clipping and slew performance.
Pic 1 - 3VPP into 10R.
Pic 2 - 10VPP into 10R.
Pic 3 - 30VPP into 10R.
Pic 4 - Residual distortion of soundcard output.
Pic 5 - Freq. Response from 20Hz to 40KHz.
Notice the first three pics. THD reading showing nearly static distortion of 0.03%. Also notice the noise floor. Now, my PCs 1KHz residual distortion is about 0.014% shown in pic 4. So you do the math.
The cutoff slopes in the freq. response trace is due to my sound-card's internal LF response and sampling rate limit.
Coming next - clipping and slew performance.
