Just 7660SCPAZ. Not SCPA but SCPAZ. No letters before digits. Bought it here, check the picture of the chip.RockKenny wrote:What kind of 7660 do you use? I mean firs letters.
I have oscillation with ICL7660SCPA.
T.
Yeah, kinda...Ichabod_Crane wrote: And now a technical question. I see the charge pump, and also a 12v regulator, right? The PSU of this pedal can be 12v or 18v. I suppose the pedal receive 12v or 18v, adjust it at 12v and the charge pump turn into 24v. Is it correct?
Thanks!Ichabod_Crane wrote: [...]
Did someone build it (the Guitard FX veroboard layout) with none of these problems?
[...]
I just built the veroboard version. No sound. The layout has 2 errors at the first op-amp stage; and I still got 5 stages more to go with potential problems.Ichabod_Crane wrote:, I would make a perfect working pedal and the veroboard layout results verified, but did someone build it with none of this problem?
Ok, I built to my layout; and the problem is same: cant get signal pass the first 2134 stage. Checked many times against the schematic,both mine and Alex's. Nothing is amissed. Tried switching the 2134 with a TL072; got a little faint fuzztone ( with a amp signal tracer)Ichabod_Crane wrote:Weird
It's declared verified. A guy built it, and he said it sounds great. Indeed, I would have some more opinions about it, and eventually issues or tricks.
That looks really cool!
Hard to say.. it depends on where you buy the parts, from how many suppliers, etc. Might be easier and cheaper to buy a kit.Danielys wrote:
Since i'm interested in building this and it'll be my first pedal, should i buy the UK-electronic or can i save some by buying all the parts myself?
I can only tell you my story and that is that I was able to fix self-oscillation by rewiring my pots.Ichabod_Crane wrote:I'm beginning to study this pedal, and I have some doubts and questions about it.
I know about some oscillation problem and I'm a bit worried.
I even know about the 560pf cap, which can replace the 47pf, but maybe getting the sound muddy.
Thanks for your comment and thanks for the great design of a german AMPbajaman wrote:Uwe has put together a complete kit of parts with an excellent pdf builder's manual too!