Accidentally reversed power polarity on my Deluxe Memory Man clone...

[guitylerham]

Ok, I've built a clone of this awesome delay but I misinterpreted the wiring diagram for the positive ground wiring for the DC jack. Needless to say, that effect didn't work. I realized my errors and corrected the polarity and got the effect working beautifully. However, after a few minutes of playing, the pedal starts to crackle and kinda sound like an intermittent "snow" channel that TV's used to have when disconnected from the cable. Anyway, using an audio probe, I can't quite locate the point between the signal sounding clear and the signal sounding crackly. My friend suggested it could be a problem in the power depart since I had current going the other direction. My question: the following components follow after the -24vdc (supply) connection:



So this is the correct polarity as the schematic calls for. Do you think I messed up any of these first components: like the 1N4007, 1N4751A, or the 50v (actually a 35v) 470uF elec cap for example? By the way I used a 24v, 1.2 amp wall wart. Your help is immenseley appreciated!

[bean]

I would start by replacing that polarity protection diode. If it did its job, you are probably in the clear.

[guitylerham]

Thank you, Bean. I'm grateful for your input on this and my other DMM post!

Which Diode is the polarity protection one? Both diodes are oriented opposite of each other.

[bean]

I'd start with the 1N4007. It's possible you could have burned up the regulator, too. You may just have to go piecemeal. Then again, sometimes it's faster to replace several things at once if you have spares.

[guitylerham]

What's so odd is that it works perfectly for several minutes. If I can't find anything else out, I'll replace those parts.

Edit, it's been on for half an hour working perfectly and hasn't made a single noise! What would cause such a random noise?

[DavenPaget]

What's so odd is that it works perfectly for several minutes. If I can't find anything else out, I'll replace those parts.

Edit, it's been on for half an hour working perfectly and hasn't made a single noise! What would cause such a random noise?

Either the regulator failed and/or the diode failed
OR it didn't do its job and the transistor got reverse avalanched and got damaged .

[guitylerham]

Just an update: I finally replaced the two diodes and the 15v regulator and  now my circuit just makes beautiful analog delay! Thank you so much for your guys' insight. I have learned to better check my wiring before applying power next time.