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Old 17th May 2009, 05:32 PM   #1
dyohn is offline dyohn  United States
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Default B-1 buffer question

Hi there. I am finally assembling the B-1 buffer using a PCB provided from Pass DIY. I notice there are two drill holes in the center of the board connected to R100 (R input) and R204 (L output.) Why are these here and am I supposed to use them for something?

Thanks!
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Old 18th May 2009, 01:50 PM   #2
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Those are passthroughs by looking at board http://www.passdiy.com/images/Store/B1%20PC%20BOARD.gif

Even great Papa can't send electrons jumping thru quantum space on boards yet.

Always best to use meter and find out for yourself, helps familiarize your self with circuit and impresses friends
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Old 18th May 2009, 02:38 PM   #3
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Some folks recommend filling the passthroughs with solder.

Is this common practice?
Is it a good idea or does it not make a difference?
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Old 18th May 2009, 06:21 PM   #4
dyohn is offline dyohn  United States
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Thank you.
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Old 18th May 2009, 09:03 PM   #5
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Quote:
Originally posted by WithTarragon
Some folks recommend filling the passthroughs with solder.

Is this common practice?
Is it a good idea or does it not make a difference?
It should not be necessary, but it doesn't hurt.

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Old 1st June 2009, 06:18 PM   #6
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Default Four Channel B1

Recently I have become a big fan of active crossovers and have been using a ganged pot after a modded Behringer DCX (crossover) and prior to 4 channels of amplification.

I saw reference to the B2 buffer, but I guess that is not being released for DIY. So I made a breadboard version of the B1 buffer (2 channel version at this point).

So currently the power supply on the B1 buffer drives two channels and it uses a power adapter from an old HP printer (18volt and 1.1 amp). I read that the B1 circuit only draws about 20 mA.

I would like to use the current Power Supply section from the B1 and have it run a total of 4 channels. My plan is simply to use the current Power Supply section and have it drive the additional circuitry for the extra channels. Although I might increase the R1 resistor from 3W to 5W.

I guess my question is whether a single B1 power supply is sufficient to drive the extra channels?

Again, I am pleased with the sound of my 2 channel B1 buffer (with the "stock" power supply). I am happy with the power supply as it is.

Cheers!
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