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Old 3rd April 2007, 09:07 PM   #1
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Default Bride of Zen

I'm planning to build this preamp and I have a few questions.Personaly,I think the input cap(C104/1F) need to be a good one a Tin folie or better but what about the output cap(C103/10F)?
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Old 3rd April 2007, 09:10 PM   #2
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Use a good cap. If necessary, bypass with a decent film cap.

Grey
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Old 3rd April 2007, 09:12 PM   #3
Zen Mod is offline Zen Mod  Serbia
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Default Re: Bride of Zen

Quote:
Originally posted by meanman1964
I'm planning to build this preamp and I have a few questions.Personaly,I think the input cap(C104/1F) need to be a good one a Tin folie or better but what about the output cap(C103/10F)?

is this a trick question?

if signal goes through both caps,conclusion can be just one............
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Old 3rd April 2007, 09:16 PM   #4
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Default Re: Re: Bride of Zen

Quote:
Originally posted by Zen Mod



is this a trick question?

if signal goes through both caps,conclusion can be just one............
Why do you think this is a trick question?
If you can give me some good advice about building this preamp feel free.
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Old 3rd April 2007, 09:19 PM   #5
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Default Re: Re: Re: Bride of Zen

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Originally posted by meanman1964


Why do you think this is a trick question?
just because answer is perfectly clear from question..................

never mind;look at few pics:

http://choky.on.neobee.net/My_BOZ.html
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Old 4th April 2007, 04:51 AM   #6
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Quote:
Originally posted by GRollins
Use a good cap. If necessary, bypass with a decent film cap.

Grey

What about bypass with a Styroflex or a Roederstein MKP 1837
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Old 5th April 2007, 05:00 AM   #7
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Can I use a bigger output pot?Like 50K instead of 5K,so I can lower the output cap from 10F to 2.2F.
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Old 5th April 2007, 04:03 PM   #8
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The value of the DC blocking cap at the output is dependent not only on the value of the pot, but also on the input impedance of the amplifier.

Grey
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Old 6th April 2007, 05:17 PM   #9
Spirtos is offline Spirtos  Greece
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Hi,
using the original value for the volume pot, the output impedance will be 0- 1,5k depending on the position of the volume pot. If you increase it, the output impedance will be increased too. This would be a problem for your power amp if it has low input impedance.
I have used a 10uF SCR polypropylene cap for output with good results. It's too expensive to use something "great" in this value.

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Old 6th April 2007, 06:35 PM   #10
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Quote:
Originally posted by Spirtos
Hi,
using the original value for the volume pot, the output impedance will be 0- 1,5k depending on the position of the volume pot. If you increase it, the output impedance will be increased too. This would be a problem for your power amp if it has low input impedance.
I have used a 10uF SCR polypropylene cap for output with good results. It's too expensive to use something "great" in this value.

Regards
Spiros

Hi,
Look at the Sewa tread post #655
I'm wondering if I could replace the MKP 10F for a 8.2F?
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