Bosoz pots

HeadSh0T · 11th July 2003, 05:28 PM

I'm new to this forum but I'm usually on the digital and tube forum here at diyaudio...

I'm building the bosoz but when i was ordering the clarostat pots from digikey, i got a shock when i looked at the price and the number of pots i needed...

so i cancelled the order hoping to find a cheaper substitute elsewhere...

searching in the pass labs forum, i've found people making stepped attenuators after failing to find a 5K dual ganged pot...

I was able to find dual 10K bourns pots on mouser.. but the 5K pots are giving me trouble..

so should i just stick with the clarostats that are specified in the article or is there a dual or quad ganged pot that somebody can recommend?

I don't want to spend the $18.66CAD/pot if possible on digikey...

And everytime i want to adjust the volume, i have to turn 4 pots.. that seems like a pain to do..

any suggestions?

lawbadman · 11th July 2003, 06:35 PM

Check this out.
There is a dual 5k pot at Digikey that I will be fine for the Bosoz, the cat. number is P2G1502-ND.

HeadSh0T · 11th July 2003, 06:56 PM

have you used this pot? I noticed that it's 0.5W. Is this enough if the specs call for 1W?

lawbadman · 11th July 2003, 07:10 PM

This pot should be fine.
I will be using the same pot for my bosoz.

lgreen · 14th July 2003, 05:58 PM

I am building one of these as well. I bought all the pots mentioned in the article, now that I have a channel up and working (I think), here are my recommendations:

1. Get the pot P5, its good to have in there to adjust gain.

2. Pots P3 and P4 are what people use for the volume control, these are 5K but in parallel with 100K. I got a pair of ALPS dual pots (20K) and will simply put them in parallel with a suitable value (removing the 100K resistor) to give the equivalent resistance. So I think you can substitue any value for the 5K pot, as long as you put it in parallel with a resistor so your total resistance is the same as 5K parallel 100K. This should be electrically identical, but the rate of volume change might be different. I have not tried my approach yet, but I have the parts and hopefully can try it out in the next month.

3. Pots P1 and P2 can be taken out after you adjust the input gain to your liking so long as you replace them with the equivl. resistance. If you only buy 2 you can find the optimum setting and then take them out. I probably will leave mine in since I have 4, but probably should not have bought this many.

Stabist · 8th October 2004, 10:33 AM

I've found in Bürklin catalog Bourns series-91 - stereo - and values available are:
2x2K5; 2x5K0; 2x10K; 2x50K; 2x100K.
The price (without taxes, shipping costs, ...) is around 9Eur.

till · 8th October 2004, 10:44 AM

What about relays? http://home.tu-clausthal.de/~tpa/relais/IMAGE0012.JPG

11th July 2003, 05:28 PM	#1
HeadSh0T diyAudio Member Join Date: Sep 2002 Location: Toronto, Canada	Bosoz pots I'm new to this forum but I'm usually on the digital and tube forum here at diyaudio... I'm building the bosoz but when i was ordering the clarostat pots from digikey, i got a shock when i looked at the price and the number of pots i needed... so i cancelled the order hoping to find a cheaper substitute elsewhere... searching in the pass labs forum, i've found people making stepped attenuators after failing to find a 5K dual ganged pot... I was able to find dual 10K bourns pots on mouser.. but the 5K pots are giving me trouble.. so should i just stick with the clarostats that are specified in the article or is there a dual or quad ganged pot that somebody can recommend? I don't want to spend the $18.66CAD/pot if possible on digikey... And everytime i want to adjust the volume, i have to turn 4 pots.. that seems like a pain to do.. any suggestions?

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11th July 2003, 06:35 PM	#2
lawbadman diyAudio Member Join Date: Mar 2003 Location: St. Catherine, Jamaica	Check this out. There is a dual 5k pot at Digikey that I will be fine for the Bosoz, the cat. number is P2G1502-ND.

11th July 2003, 06:56 PM	#3
HeadSh0T diyAudio Member Join Date: Sep 2002 Location: Toronto, Canada	have you used this pot? I noticed that it's 0.5W. Is this enough if the specs call for 1W?

11th July 2003, 07:10 PM	#4
lawbadman diyAudio Member Join Date: Mar 2003 Location: St. Catherine, Jamaica	This pot should be fine. I will be using the same pot for my bosoz.

14th July 2003, 05:58 PM	#5
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	I am building one of these as well. I bought all the pots mentioned in the article, now that I have a channel up and working (I think), here are my recommendations: 1. Get the pot P5, its good to have in there to adjust gain. 2. Pots P3 and P4 are what people use for the volume control, these are 5K but in parallel with 100K. I got a pair of ALPS dual pots (20K) and will simply put them in parallel with a suitable value (removing the 100K resistor) to give the equivalent resistance. So I think you can substitue any value for the 5K pot, as long as you put it in parallel with a resistor so your total resistance is the same as 5K parallel 100K. This should be electrically identical, but the rate of volume change might be different. I have not tried my approach yet, but I have the parts and hopefully can try it out in the next month. 3. Pots P1 and P2 can be taken out after you adjust the input gain to your liking so long as you replace them with the equivl. resistance. If you only buy 2 you can find the optimum setting and then take them out. I probably will leave mine in since I have 4, but probably should not have bought this many.

8th October 2004, 10:33 AM	#6
Stabist diyAudio Member Join Date: Sep 2002 Location: Slovenia	I've found in Bürklin catalog Bourns series-91 - stereo - and values available are: 2x2K5; 2x5K0; 2x10K; 2x50K; 2x100K. The price (without taxes, shipping costs, ...) is around 9Eur.

8th October 2004, 10:44 AM	#7
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	What about relays? http://home.tu-clausthal.de/~tpa/relais/IMAGE0012.JPG

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