Dark Rift Delay -- PCB Routing Available?

[funkmasterron]

I'm working on a friend's DRD pedal that was accidently connected to 18VDC power...

Is there a routing diagram of the PCB traces available? I'm specifically interested in how the output of IC4 (5V) net is routed from IC4 to C20, C23, and the 5V net to the other ICs.

Powering it with a Boss style 9V adapter, I see 8.82VDC going into the linear regulator IC4 (which I replaced with a 7805), but IC4 output (pin 1 closest to the PCB edge) is measuring 8.12VDC, while C20 and C23 are measuring 5.1VDC. They all should be connected together and measure around 5VDC. I have all of the other ICs removed (and replacements ready).

I'm using this document for the parts placement and schematic:

https://docs.pedalpcb.com/project/DarkRiftDelay.pdf

 

[z2amiller]

Could the pinout of the 7805 be backwards? I think 7805 and 78L05 are switchsies. It looks like it's already in backwards
but just check out the datasheet and make sure it's in the way it's supposed to be.

Theoretically yeah all of those should be at the same voltage - do they have continuity when measured w/
a multimeter in beep mode? I suppose you coulda burned out a trace or something with the 18V. Measure
all of the things that get 5V (those caps, plus the PT2399) and see if you can find the place where the resistance
goes > 0.


FTR the op-amps are all probably fine. They're mostly designed for at least +/- 15 volts (I.e. 30 volts - so 18 volts is fine).
The 78L05 (and probably whatever you replaced) is also rated for ~30V VIN, though dropping 13V instead of 4V might've generated
a lot of heat if it was hooked up for a while.
Any 10V rated electrolytic caps on the board are cooked, but all the ones I see are 35V. I guess it's possible
that the tantalum cap is cooked also if it's only rated at 10V but since it didn't catch on fire it's probably fine.
The PT2399 has the potential of being cooked. The LFO is going to output around VREF_B which will be 9V.
I looked at the datasheet for the PT2399 and it didn't say what the absolute max was on any of the input
pins, but it's usually bad for that to be > VIN which was still 5V. (And absolute max VIN is 6.5V).

If you pull the PT2399, is the voltage better on those caps?