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(one more) ALEPH P 1.7 clone

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#581
Hello Folks:

Roughly what voltage will the output 30uF/47uF capacitors bundles be exposed too?

The NX black gates I think I can get are only rated to 6.3V. Alternatively I can get 10uF/50Volts or 100uF/16V N series. Which would be better? (I see mention of quite significant "bias" on the input and output capacitors earlier in the thread ... is this the voltage "seen" by the capacitor?

Is this little quote relevant to my question:

2) You're right about the BG's, you need 10uF/50V series N on the input and 47uF/50V series N on the output.
Click to expand...

Could you use a Black Gate polarized type capacitor if you put it in the right way round?

Regarding input capacitors: are these mainly for filtering, or are there lots of sources which have significant DC in their outputs?

Finally, where do the trim-pots go to eliminate the need for output capacitors? "Wayne's" name keeps coming up in this regard, but I don't know who he is, or the details of his tweak.

Thanks,
George
 
#582
GeorgeBoles said:
Hello Folks:

Roughly what voltage will the output 30uF/47uF capacitors bundles be exposed too?

Could you use a Black Gate polarized type capacitor if you put it in the right way round?

Regarding input capacitors: are these mainly for filtering, or are there lots of sources which have significant DC in their outputs?

Finally, where do the trim-pots go to eliminate the need for output capacitors? "Wayne's" name keeps coming up in this regard, but I don't know who he is, or the details of his tweak.

Thanks,
George
Click to expand...



1. 30v. 50v cap rating will be safe
2. You can use polarised caps but polarised BG don't have the same reputation as non-polarised. I have used bypassed 100uF Cerafine and the sound was quite good.
3.Input caps are there to block the MOSFET bias voltage rather than offset from a source
4. No idea what trimpots are you talking about. In this circuit you cannot eliminate the output coupling cap.


30uF is an unnecessary high value in my view. By slightly raising the output attenuator to say 2k you'd get by with 10uF.
 
#585
Aleph P volume problem

Hey guys I need your help!!

I have just completed my aleph p, but at the highest volume (stepped attenuator at output), the volume is still lower than the source. I didn't ground the signal to the case, but I have the AC earth ground is connected to the case through a CL-60. Would that be the cause?

Thanks,
Peter
 
#586
Re: Aleph P volume problem

peterpan188 said:
Hey guys I need your help!!

I have just completed my aleph p, but at the highest volume (stepped attenuator at output), the volume is still lower than the source.
Click to expand...


Peter...First check the attenuation resistors that set the gain via the switches for correct values and switch setting. (max gain ~14dB)
Then verify the gain adjust pot.
If these are all correct, verify the voltages at the output caps. They should be faily equal.
 
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