Bride of Zen

meanman1964 · 3rd April 2007, 09:07 PM

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

GRollins · 3rd April 2007, 09:10 PM

Use a good cap. If necessary, bypass with a decent film cap.

Grey

Zen Mod · 3rd April 2007, 09:12 PM

Quote:

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

is this a trick question?

if signal goes through both caps,conclusion can be just one............

meanman1964 · 3rd April 2007, 09:16 PM

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.

Zen Mod · 3rd April 2007, 09:19 PM

Quote:

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

meanman1964 · 4th April 2007, 04:51 AM

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

meanman1964 · 5th April 2007, 05:00 AM

Can I use a bigger output pot?Like 50K instead of 5K,so I can lower the output cap from 10µF to 2.2µF.

GRollins · 5th April 2007, 04:03 PM

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

Spirtos · 6th April 2007, 05:17 PM

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

meanman1964 · 6th April 2007, 06:35 PM

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 10µF for a 8.2µF?

6th April 2007, 05:17 PM	#9
Spirtos diyAudio Member Join Date: Apr 2005 Location: Athens, HELLAS	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 __________________ Where there is a "will" , there is a way! I hope...

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3rd April 2007, 09:10 PM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Use a good cap. If necessary, bypass with a decent film cap. Grey

5th April 2007, 05:00 AM	#7
meanman1964 diyAudio Member Join Date: Oct 2006 Location: Belgium the land of chocolate	Can I use a bigger output pot?Like 50K instead of 5K,so I can lower the output cap from 10µF to 2.2µF.

5th April 2007, 04:03 PM	#8
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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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