Tremulus Lune Debug

[rhys]

Having some issues with a trem lune build. 

I used an audio probe and didn't get far; there's no sound on any of the pins of the TL072.  I tried swapping the TL072 for another with no change in the results. 

Here's the schem. http://commonsound.org/tremulus/tremulusscheme.pdf

Here are the voltages:

TL072
1- 7.43
2- 1.17
3- 3.07
4- 1.05
5- 0.01
6- 1.05
7- 1.1
8- 6.45

4558
1- 7.37
2- 0.51
3- 0.45
4- 1.16
5- 0.01
6- 0.29
7- 2.01
8- 2.01

Thanks. 

[kvb]

if you have a voltage on a pin that should be grounded (should be 0v on pins 4) there is a problem somewhere that is related to the soldering.  Use your meter to see that everything that is/ should be grounded reads 0v. Reflow all joints and look for errors.

The good folks here have always given the advice that it is more important to reach for your meter, even before you go for the audio-probe.  Many times on my builds I have resisted the urge to post and just kept poking around with the meter and reflowing joints.

start from the final ground connection and work your way backward through the circuit measuring and then reflowing joints. you'll be amazed (maybe) to see that the readings change if the joint was not a good one.