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Placid BP - Problem Increasing Output Voltage by Adjusting VR3 & VR4
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Voodoo002  
#1 Posted : Wednesday, April 6, 2011 12:18:33 PM(UTC)
Voodoo002

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Hi,
I'm a bit of a noob when it comes to DIY audio so I might be doing something stupid here...
Following the instructions I had no problem adjusting VR1,2,3 and 4 to the correct Ohms, I connected the power supply and had 4 LEDs light up and everything seems to check out fine.
However I cannot get the voltage to increase or even decrease when I adjust VR3 and VR4, one output reads 1.6V and the other 1.3V but it does change when I adjust VR1 and VR2 for some reason.

I'd appreciate any help :)

Edited by user Wednesday, April 6, 2011 12:19:23 PM(UTC)  | Reason: Not specified
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mimp  
#2 Posted : Thursday, April 7, 2011 1:35:44 AM(UTC)
mimp

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Voodoo002 wrote:
Hi,
I'm a bit of a noob when it comes to DIY audio so I might be doing something stupid here...
Following the instructions I had no problem adjusting VR1,2,3 and 4 to the correct Ohms, I connected the power supply and had 4 LEDs light up and everything seems to check out fine.
However I cannot get the voltage to increase or even decrease when I adjust VR3 and VR4, one output reads 1.6V and the other 1.3V but it does change when I adjust VR1 and VR2 for some reason.

I'd appreciate any help :)


I'm also fairly new to all this but had pretty much the same symptoms as you with the placid (I think the BP is more-or-less two placids on one board) and it turned out I'd soldered in one of the transistors backwards. so that might be checking - QP2 specifically.
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Voodoo002  
#3 Posted : Thursday, April 7, 2011 5:47:25 AM(UTC)
Voodoo002

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thanks mimp, but the transistors are soldered fine Brick wall
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Brian Donegan  
#4 Posted : Thursday, April 7, 2011 5:55:32 AM(UTC)
Brian Donegan

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I would triple-check that all the transistors are in the proper spots
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Voodoo002  
#5 Posted : Thursday, April 7, 2011 8:50:03 AM(UTC)
Voodoo002

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Ah! Thanks Brian will rectify this skool boy error d'oh!
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Voodoo002  
#6 Posted : Thursday, April 7, 2011 12:21:27 PM(UTC)
Voodoo002

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All sorted now and the buffalo is singing those sweet, sweet tunes!

Fantastic DAC you've created Russ and Brian Applause

Tridents tomorrow Drool
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