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  1. M

    Drive pedals that can run at 12v or 18v

    It looks like the build docs spec an LT1054 which according to the data sheet absolute max supply voltage is 16v. Keep in mind that if it is doubling voltage, it would double 9v to about 17v to 18v, and it would double 12v to 22v to 24v. Once again as long as all the other parts downstream...
  2. M

    Drive pedals that can run at 12v or 18v

    Pretty much anything that doesn’t have a charge pump, as long as the electrolytic caps (the ones that see full supply voltage at least) are high enough voltage. I like to order 50v electros as they usually are small enough to fit on the board (sometimes not the 100ufs though) so I can...
  3. M

    A couple of questions…

    I never used breakout 3pdt boards since I never bothered to order them. I got some for free from a pcb order with a different company and they do seem to slightly speed assembly, so in the future I’ll use them if I have them but doubt I’ll go out of my way to order them. I always socket IC’s...
  4. M

    Parenthesis Fuzz Boost problem

    Mosfets seem to be fragile, I killed the bs170 in mine by swapping guitars with the boost mode engaged, (‘fuzz’ side off) as soon as I plugged in the other guitar, boost mode was as you describe, until I swapped bs170’s. Must have been some static or something? Dunno, but now I make sure it’s...
  5. M

    Pondering the effects of bad soldering

    I built a jfet copy of an orange graphic mk II preamp. It sounded great the day I made it, then dark and farty the next day. I found changing the j201’s used seemed to make it sound good for a minute or so then it went back to sounding farty. Turns out changing the jfets didn’t make it sound...
  6. M

    What's on the workbench?

    I built a high voltage tube buffer once using one of those cheap high voltage boost converters off eBay, it worked for about 20 minutes until one of the filter caps on the boost converter exploded. What a smell. I never did bother getting it working again, kinda scared me off those cheap...
  7. M

    isosceles

    Depends how you’re running it, the grind/33 modes cut a ton of bass which will reduce overall output. They are also very similar, to my ears the 33 sounds slightly brighter, like the treble knob fixed at a slightly higher value. try comparing them to the Tc preamp mode with bass at 0 and treble...
  8. M

    Expectation: High/Low…

    I like the parenthesis but I was under no illusions that it was anything other than three already-established circuits in one box. I quite like having a clean boost there for whenever I need it. Sure does save space. it’s a good example of how you rarely become a successful pedal builder by...
  9. M

    BC550C

    I’m not sure how much of a sound difference it would make, I don’t have the isocoles but I did build the integral pre as it has an on/off switch unlike the original integrated preamp. They pretty much sound the same (allowing for pot taper differences), the integral being maybe slightly higher...
  10. M

    BC550C

    Maybe doesn’t help but my real tc integrated preamp has a bc413c for that transistor. it also has a bc547b for the constant current source (schematic specs bc548b) but that part is excluded from the isocoles schematic. Apparently that part was wired incorrectly in the original 33 pedal (and...
  11. M

    Expectation: High/Low…

    I wasn’t super impressed by the Wrecktifier distortion, but I built that one right off the back of building the BE-OD clone, which is fantastic, so the Wrecktifier didn’t really stack up as well. I also built the BBE sonic maximiser clone, but this was quite a while ago and at that time the pcb...
  12. M

    String gauge what are you using?

    25.5” I do have 11’s on some guitars, but only the ones where the thicker strings sound better on that guitar. I just think thinner strings tend to sound better, especially for low tunings. I mostly play 7 strings down one step in A-standard (just D-standard with an extra low string), using...
  13. M

    String gauge what are you using?

    10’s, but down a full step 🙇‍♂️
  14. M

    Inexpensive power supply

    can you get by with just one transformer, but an individual secondary (and rectifier, filter, regulator) for each output? I’ve seen diy projects both ways, just wondering if there is actually a difference.
  15. M

    Boss Hm-2

    I made one of these a while back, though I only have the behringer clone to compare with. I thought it was also kinda different, especially the treble knob, like it’s distorting more or something. I found replacing the op amps with 4558 and powering at 12 volts got it about 95% there. Maybe I...
  16. M

    Your best method for removing thorugh-hole components from a PCB

    I bought one of these since it looks quality, arrived yesterday and today I’ve been pulling electrolytic caps out of a pedal from the mid-80’s since it stopped working last week. that pump is unreasonably good. Pretty much clears the entire pad on the first shot, so I can just lift the...
  17. M

    Partscaster build

    if you can’t use a drill press I highly recommend buying a ‘drill guide’, you can get ones where you clamp your drill into them (must be a hammer drill with a space on the front to clamp) and slightly more expensive ones that have a Chuck attached and you just attach your drill to the end...
  18. M

    Diode Clipping Question

    I don’t think parallel diodes facing the same way actually do anything different than just having one… so the one on the left would be symmetrical hard clipping with an extra redundant diode, and the one on the right would be assymetric hard clipping. (Forward voltage of the two series diodes...
  19. M

    Isosceles Boost noise issue with the trebble pot ccw anyone?

    To copy the sound of the 33 / grind settings, as they are more-or-less just the tc preamp with bass at 0, and then the treble at two different positions.
  20. M

    Isosceles Boost noise issue with the trebble pot ccw anyone?

    That’s about right. When I made a Triangulum I took the parts values around the switch from the isocoles schematic and added that to the Triangulum (didn’t need the full isocoles as I already have multiple tc preamps), difference is very subtle. Slightly less treble in the ‘grind’ setting...
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