No effect in Leprechaun

[mistercarey]

OK, so I'm stuck. The bypass works, and when turned on the sound still gets through no problem, except it's clean. No effect. I can ever so faintly hear something, particularly when I hit the magic switch. I check the voltages listed in the schematic. Everything that was supposed to be 3.3v was. I went through every pin on the FX chip.
6, 8, 16, 17, and 23 were all 3.3 (26 was 3.2)
4, 7, 11, 12, 13, 18, 19, 24, and 25 were all 0
I don't know what the others are supposed to read, so here are those.
1,2,3 - 1.65
5, 14, 15, 20 - 3.3
9 - 1.47
10, 21, 22 - .76 to .86
27, 28 - 1.7

I'm still learning how to troubleshoot and I'm not really sure what to do at this point. Any insight would be helpful

 

[erwinsoundsystem]

Hi,

I am currently facing the same problem with the Leprechaun. Did you by it as a kit from Musikding by any chance?

I went through hours of troubleshooting and my guess is that the Spin FV-1 is not programmed at all.

 

[erwinsoundsystem]

Dear other forum members,

I also built a Leprechaun - same problem: I can’t hear any effect signal. When I power on the pedal, I hear the same sound in the on position as I do in bypass mode—no effect (not even a faint one), at the same volume, and no crackling when switching. The pots have absolutely no effect on the signal. Without power, I can’t hear anything at all—the signal is completely dead when the pedal is on (but the bypass works).

I’d like to ask, just to rule it out for further troubleshooting: Could this behavior be possible if the Spin FV-1 chip isn’t programmed correctly or is “empty”? Is there a way to check this after it’s been soldered in?

I bought the pedal as a kit in Germany with all the components.

Best regards,

Jan

 

[Erik S]

Dear other forum members,

I also built a Leprechaun - same problem: I can’t hear any effect signal.

The best course would be to post your own troubleshooting thread including enough clear pictures that we can see all your component values and wiring connections.

Problems with wiring, DC power, or component values would all be more likely causes than a faulty IC.

 

[Robert]

I’d like to ask, just to rule it out for further troubleshooting: Could this behavior be possible if the Spin FV-1 chip isn’t programmed correctly or is “empty”? Is there a way to check this after it’s been soldered in?

The FV-1 doesn't get programmed, it's the 24LC32A EEPROMs that need to be pre-programmed before using them.

In this case however, the Leprechaun uses one of the internal programs of the FV-1 and doesn't require an EEPROM at all.

@mistercarey Your TL072 IC's don't look genuine. They might not be the problem, but keep that in mind if nothing else turns up.

 

[phi1]

If you have (or make) an audio probe, you can check for sound going in and coming out of the FV-1 (pin1 in, pin28 for out).