SOLVED Caesar Chorus - where does the Rate LED connect?

[sacuna]

Hi, nearly finished my Julia clone. I accidentally ruined the rate LED solder pads, so I am hoping to solder the LED leads somewhere else. However, by looking at the circuit boards I cannot figure out where the rate LED pads connect to. Can anyone help me out? The easiest answer would be to consult the schematic, but it still says "schematic coming soon" on the build docs. Thanks!

 

[zgrav]

Second best option to having the schematic for the build document might be to track down the schematic for the pedal this is based on.

 

[sacuna]

I agree... and I believe the Julia was based on the CE-2 (I could be wrong). However, when I looked up those schematics, but they did not seem to have a Rate LED that would flash with the LFO. I tried to find other schematics with a similar Rate LED function, but I could not seem to find anything analogous to this circuit.

 

[zgrav]

here is a link to the PORK BARREL build doc FYI.

 

[sacuna]

Thanks for sending this. I traced out everything stemming from the op amp, like you suggested, but could not find a resistor like R44 in the schematic. So looks like the rate LED has a bit different signal path. However, I do no know that one of the leads goes to ground, so that makes things a bit easier. I just need to know where the Anode of the Rate LED connects now.

 

[zgrav]

Note your LED might connect to the op amp and then flow through a resistor to ground. So you can't assume one lead connects to ground.

Look at both sides of the PCB where the rate LED connected and you should be able to see the traces that connected to those holes on one side of the PCB or the other. Then follow that trace to whatever part is connects with, and that is where the LED should connect.

 

[sacuna]

Thanks for the help. I tried following the trace before, but it did not seem to connect to the rate LED. The trace was a little unintuitive, because it is hidden under the installed capacitor. But I followed it and it works! Rate LED is working again.

If anyone else has this issue, the A connects to R11 (right side) and K connects to ground.

 

[zgrav]

Glad you got it sorted out.