Recent content by mnemonic

R8 and C4 1.8k/100n set the low cut a bit higher than stock, 884hz vs the standard 720hz of the 4.7k/47n. Maybe larger input cap plus more low cut to compensate is what is doing it for you.

I dug out an old tubescreamer clone (a dwarven hammer that I didn’t really like so I just converted it to stock ts9, and also the rotary switch broke so I hardwired it to the standard low cut). I added the extra diodes with 220k, and since i used a DPDT switch I also put the clipping diodes on...

Interesting I haven’t seen diodes like that before. Ive made a lot of modded ts’s and my favorite one has a pot in place of R8 (with a series resistor so I can’t drop it to 0 ohms) and the lower it goes the higher gain the pedal gets (also the low cut frequency goes up but that is somewhat...

Stephen Fryette misspelled his own last name on the pcb in my Fryette 2/50/2 power amp. It reads ‘Fryeette’ on one part

I have an arion tubulator (ts clone) I got back in college when I was poor, it has the same ACA thing going on. Easy way to tell, plug it into a 9v regulated supply buy itself, then daisy-chain another pedal (non-aca) using the same power supply. If the indicator LED suddenly gets brighter when...

Just saw this one on the coming soon page, is there anything actually interesting going on with the circuit? I don’t know enough about tracing pedals to glean anything useful from the sample pcb layout picture.

A pedalpcb high voltage supply? Interesting. Maybe two or three years ago I made a tube buffer (copy of VHT Valvulator) using one of those cheap boost converters off eBay for the high voltage, powered by a 12vdc power supply and also powering the heaters with the same 12vdc. It worked (but...

I had the same problem with pf caps for a long time when using my multimeter, below 1nf I just hoped they were right. I got one of the mega328 kit testers off eBay really cheap, works very well for pf caps, larger caps (also shows vloss and esr), transistors, diodes, etc. The tc1 tester...

potentially not a problem at all... I have been using this pedal (or the original) for years, but it was more about whether the sound could be improved by reducing clipping. I will try fiddling with R6 tomorrow and see what that does.

Ok, must be a weird circuit indeed. The voltage divider for VREF is 100k/1m, so I paralleled a 120k resistor on the 1m so the divider is now 100k/107k. VREF now 15.45v, VCC still 31v. Sound is very gated, distorted, and quiet. changed to 500k parallel with the 1m (value now 333k), now...

Sorry I'm a bit of a noob when it comes to biasing (and much other stuff), I have just measured VCC as 31.40v, and VREF as 27.96v. Should VREF then be lower, closer to 15v, to avoid clipping?

Hi guys, I have an Integral Pre (TC Integrated Preamp) that I built a while ago, the only problem I have with it is I get some op-amp clipping with my loudest guitar when I wang on the strings hard (which is most of the time). I know the build is fine as my original TC integrated preamp, as...

If you want to avoid special switches (that would be my preference as the backs of my cabs are hard to reach and switches can get bumped), you can do this with three switching jacks. you could also go ‘easy mode’ and just buy the ‘plug and play’ jack plate (but where’s the fun in that). Here...

That top row of pots on the KOT looks like a real time waster from an assembly point-of-view. I’m a cheap-ass and I will buy the cheapest pots for my builds, often solder-lug or short pcb pin, I just solder solid core wire to the pot and bend it to wherever it needs to go. Never let me down...

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...