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Hi everyone,

Was just going over the schematic for the VFE Triumvirate and noticed that the diode clipping section in the treble part of the circuit has a link joining all four diodes (cathodes of D3 and D5 + anodes of D4 and D6).  Not sure I've seen this arrangement before and wondered if someone could provide a little explanation of the pros/cons of the "jumper"?

- brad -

Just a quick note to ask if and when the VFE Triumvirate PCB might be back in stock.  I asked Brian a similar question by email but thought I'd post here as well as per his suggestions on sharing the Q's and A's with all forum members.

I'd also be interested in buying from any forum members how might have a spare Triumvirate kit they aren't planning to get to...

Thanks,

- brad -

Hi folks!

Troubleshooting my build...I've got very little output and it's clean (not distorted at all).  I've noticed that D3 and D4 are "shorted" (i.e. same voltage measured in same direction) but I'm not sure if that's an issue in this circuit.  I have also measured the following voltages so I'm hoping someone can point me in the direction of the most likely culprit(s).

Voltages:

Supply at board = 9.14

Q1:
C = 5.38 (General Guitar Gadgets (GGG) calls for 2.20)
B = 0.00 (GGG calls for 0.73)
E = 0.00 (GGG calls for 0.16)

Q2
C = 4.77 (GGG calls for 7.50)
B = 5.38 (GGG calls for 2.20)
E = 4.74 (GGG calls for 1.60)

Q3
C = 6.94 (GGG calls for 7.28)
B = 0.83 (GGG calls for 0.78)
E = 0.21 (GGG calls for 0.22)

Q4
C = 7.53 (GGG calls for 7.63)
B = 0.82 (GGG calls for 0.84)
E = 0.24 (GGG calls for 0.26)

Any help would be much appreciated!

Reposting a 3PDT wiring question that I shared with the "DIY Stompboxes" Facebook page: I've built a 2 loop switcher using a 3PDT switch with a second 3PDT that bypasses the two loops. I have noticed that the NON-selected loop tends to bleed a little signal onto the selected loop and I'm pretty sure that this is because the inputs are NOT grounded (I know this can be an issue but still don't fully understand given the concept of "true bypass") so my question is this: can I ground the inputs on the LED indicator poles of the 3PDT as shown by the dotted lines in my photo without issue or is a 4PDT switch a MUST in this scenario?

Hi everyone!

I'm planning to begin work on a couple of Madbean Wigl boards and I had a quick question about the two "indicator" LEDs:

If I only want to use a SINGLE indicator LED and I want to have it flash in time with the rate setting, can I omit "LED1" completely and then run the "LED2" cathode to the "-" trace for "LED1" instead of the "LED2" cathode trace (hopefully my point is a LOT clearer than my words appear to make it!!!)?

Thanks,

- brad -

I'm working on a project with a charge pump and have run into the dreaded oscillation/whine of the ICL7660.  I have used both the "C" and "S" variants without any luck in removing the noise.

I happen to have a few TC1044SCPA's in my collection and see that a fellow on another forum used one successfully in his build so I am curious to know if anyone confirm that the TC1044SCPA is an acceptable alternative for the ICL7660S (the spec's appear to be similar but I am quite new to reading those things!)?

Any help would be MUCH appreciated!


- brad -