Hi Ken
When the PCB is powered up , if i put my finger on the BC547 in the the 6V section. It is cool to the touch for a few
seconds then becomes very hot very quickly.
I have changed out all of the electrolytics and there is no change , i have looked over and over and can't find a short.
Now that the electros in the power filtering are changed , should i put another BC547 in ?
I'm racking my brain but can't find a solution.
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Saturday, October 5, 2013 12:13 PM
Subject: RE: Re: [cgs_synth] RE: CGS82 Negative Slew
To: cgs_synth@yahoogroups.com
Sent: Saturday, October 5, 2013 12:13 PM
Subject: RE: Re: [cgs_synth] RE: CGS82 Negative Slew
The links are all part of the 0V power rail. with any of them missing, nothing was working properly.
---In cgs_synth@yahoogroups.com, <cgs_synth@yahoogroups.com> wrote:
Thanks Ken
I've been looking for a
short , will keep looking.
Any clue on why it works without that link installed ? Could that be the key to tracking down
this problem ?
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Saturday, October 5, 2013 9:21 AM
Subject: [cgs_synth] RE: CGS82 Negative Slew
To: cgs_synth@yahoogroups.com
Sent: Saturday, October 5, 2013 9:21 AM
Subject: [cgs_synth] RE: CGS82 Negative Slew
First, find where the short circuit is! The transistor should not get hot.
Ken
---In cgs_synth@yahoogroups.com, <cgs_synth@yahoogroups.com> wrote:
Hi Ken and All
I finished building the CGS82
Negative Slew. Had i 'working' , as far as i can understand it so far , but the bottom section LED was not working.
While i was trying to troubleshoot that problem , i noticed i had omitted the link that's between the RATE pads on the PCB and the 22K trimmer.
When i put that link in , every thing seems to have
stopped working and the BC547 in the 6V section directly above the 6.8K resistor is getting very hot under power.
Should i replace the BC547 , not too sure how to proceed.