BOZ questions

Praudio · 14th January 2003, 02:58 PM

I am building a BOZ and would like to use fixed resistors(instead
of 100k pot) at input,my power amp need 1.25v for full output. What value seem to be a good choice.

Also it seem that EB on TIP 29c are in reverse position if TIP29c
is well BCE(as per original article TAA/94 and Pass Lab site.

Thanks for your help.

Taco · 14th January 2003, 03:51 PM

You mean stepped attenuator? Or 1 volume level?
I had troubles with only a POT at the output, the amplifier distorted like hell. Now I have put a 100k resistor in series with the input. For the powersupply I used the BD139.

SDF · 15th January 2003, 10:56 AM

Hi Praudio, you should calculate the resistor attenuator. it depends to the output voltage level of your source (CD player ) Give me it I will give you the result.

14th January 2003, 02:58 PM	#1
Praudio diyAudio Member Join Date: Mar 2002 Location: Canada	BOZ questions I am building a BOZ and would like to use fixed resistors(instead of 100k pot) at input,my power amp need 1.25v for full output. What value seem to be a good choice. Also it seem that EB on TIP 29c are in reverse position if TIP29c is well BCE(as per original article TAA/94 and Pass Lab site. Thanks for your help. __________________ Praudio

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14th January 2003, 03:51 PM	#2
Taco diyAudio Member Join Date: Nov 2002 Location: Place in the Netherlands	You mean stepped attenuator? Or 1 volume level? I had troubles with only a POT at the output, the amplifier distorted like hell. Now I have put a 100k resistor in series with the input. For the powersupply I used the BD139.

15th January 2003, 10:56 AM	#3
SDF diyAudio Member Join Date: Jun 2002 Location: FRANCE	Hi Praudio, you should calculate the resistor attenuator. it depends to the output voltage level of your source (CD player ) Give me it I will give you the result.