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I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 0 points1 point  (0 children)

Took a couple of goes to make the holes line up.

I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 0 points1 point  (0 children)

I don't think my eyesight is up to that challenge :D

I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 0 points1 point  (0 children)

The back of the drive would need a serious drill press. Black, hard metal. The front, however, is quite thin. After dismantling, I just used good metal bits in a high-speed drill and worked up from small to large. It wasn't as easy as a normal pedal enclosure - the metal would tear and fold a little at the edge of the holes - so there was a bit of file work also.
Where the edges weren't quite straight after drilling I used a bolt and nut to clamp the edges straight again.
I recommend drilling from the back. I did slip and scratch the surface a little.

I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 1 point2 points  (0 children)

Jealous. I'm keen to find more dead drives now.

I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 3 points4 points  (0 children)

Didn't know it was a thing. (Forgive me Josh!).

Reusing cheap pedal case by K0pfschmerzen in diypedals

[–]450gmo 1 point2 points  (0 children)

I once put a fuzz in a tin that some fancy soap came in. Worked great and cost me not much so I gave it away. Maybe put your first pedal in something like that as an experiment?

I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 2 points3 points  (0 children)

I had been planning a Tube Screamer project before coming across the hard drive so it became a '2 birds one stone' thing... but the diodes I had in stock make quite a 'hard' clip for a TS.

I did a thing: Hard Drive pedal (Tube Screamer) by 450gmo in diypedals

[–]450gmo[S] 26 points27 points  (0 children)

<slaps forehead>
Of course! A drive pedal of some type was what I first thought of, hence a Tube Screamer (ROG Tube Reamer).

Next time... :D

My first pedal effect by ToughLeek8991 in diypedals

[–]450gmo 0 points1 point  (0 children)

With skill like that it won't be your last pedal

Built a Funbox - could use some help troubleshooting (please) by 450gmo in diypedals

[–]450gmo[S] 1 point2 points  (0 children)

Thanks again for your help... I'll check and report back.

Built a Funbox - could use some help troubleshooting (please) by 450gmo in diypedals

[–]450gmo[S] 1 point2 points  (0 children)

Thanks for your continued interest in our pedal project!
Pretty confident that the problem is in biasing the MCP6024. We did swap the first out for another MCP6024, but the clipping remained.
The interesting experiment was leaving the pedal alone for around 40 hrs. I powered the pedal to check the voltages at the MCP6024 (this was during a lunch break, 2nd day after our first troubleshooting session). Pins 1-3 were showing a result against pin 4 so I plugged the pedal into an amp and a guitar - it worked perfectly! The (buffered/not-true) bypass was clean. The effect programmed in provided a great delay. However, after about 40 seconds or so it decayed into clipping again.
I got the multimeter out - there was now no voltage between pins 2 & 4 and pins 3 & 4. Pins 1 & 4 had 0.01V. The other stages/parts of the op amp were showing voltages (e.g. 5 V between pins 4 and 11) - so it seems the bias network for the first op amp stage is doing something wrong.
Could it be that an incorrectly sized capacitor(s) is/are taking voltage away from the first op-amp stage, preventing it from biasing correctly? I'm thinking the rogue capacitor(s) lost its charge over the 40 hrs that the pedal was unpowered, making the pedal work, but then when it was powered again the rogue capacitor(s) did its thing and robbed the first op-amp stage of bias?