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Ichiban  
#1 Posted : 14 years ago
Ichiban

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Joined: 6/14/2007(UTC)
Posts: 30
Location: WesternNewYork

It was going fine, adj. output voltages to +-15V
then voltage across R1 & R2 to .250V .

Rechecked voltage out then R1 & R2 again.

On R2 one probe slipped & contacted the HS
& the LEDS blinked. d'oh!

Now I can not get the voltage across R2
over .065V . I'd guess QP3 went south, what else
might need replacing? The output voltage is still
at 15V.

Russ White  
#2 Posted : 14 years ago
Russ White

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Did this only effect one half or both?

Check D5 and QP1. And possibly D6 and QN1.
Ichiban  
#3 Posted : 14 years ago
Ichiban

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Joined: 6/14/2007(UTC)
Posts: 30
Location: WesternNewYork

Thank you for the help.

One side only, the QP1 D1 positive
regulator side.

Voltage outs are +-15v.
All LEDs are lit at same intensity.


I can not get the voltage across R2
over .061V .

I checked the heat sinks and see they
are not connected to ground. Makes me
wonder why it caused a problem when the
probe slipped and touched it? But as I
wrote, the LEDs did blink off and back on.

I compared voltages across D5 VR2 QP1
to the corresponding voltages on their
mirror image parts in the negative side
and found them to be close/same.

What/how should I check QP1 D1 for?

Also, I have a second Placid BP v2.1.2
kit, yet to be built from which I can
cannibalize parts.

I'm thinking the opamps and QP2-3 QN2-3
are ok since the voltages regulate ok!?
Ichiban  
#4 Posted : 14 years ago
Ichiban

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Groups: Member
Joined: 6/14/2007(UTC)
Posts: 30
Location: WesternNewYork

Reading through some of the posted problems with the Placid BP and came
across someone that had a bad VR1,
so I checked mine out and it measures approx. infinate resistance on center
adj. pin.

Will see what happens when I replace
it with one from the other kit.

Edited by user 14 years ago  | Reason: Not specified

avr300  
#5 Posted : 14 years ago
avr300

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Denmark

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You will be in business again.
Ichiban  
#6 Posted : 14 years ago
Ichiban

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Joined: 6/14/2007(UTC)
Posts: 30
Location: WesternNewYork

Indeed I am! :d/

New pot 20 Ohms and
adjusts to .250v .

Now to let it cook awhile.
avr300  
#7 Posted : 14 years ago
avr300

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What are you powering ?
Ichiban  
#8 Posted : 14 years ago
Ichiban

Rank: Advanced Member

Groups: Member
Joined: 6/14/2007(UTC)
Posts: 30
Location: WesternNewYork

The Legato2 from the Sabre II, into the First Watt F5 clone into Seas Thors.

Listening to music and the shunt is
much better than the series reg. I've been
using since the first TP Buffalo24.

Next up the 5 volt shunt.

Edited by user 14 years ago  | Reason: Not specified

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