Dirk_Hendrik wrote:quick hints on first imression. You're doing a fine job so far.
- IC1.2 is to be biased somewhere to Vr. Suspect R6. R6 to GND is senseless.
- C2 as well unless it's in the pF range
- R4 as feedforward loop?? no way!
-C37 like this?? Must be more there.
- There's something going from the junction of R23 and C39 to an opamp input.
Keep on posting schematic updates. The more gets clear, the easier it is to point out the uncertainties.
Thanks for the hints Dirk, I was also wondering on those points too.
R6 to ground is not going to work but after checking several times it really seems to go to ground.
R4 As feedforward loop ? This is one that really confues me (it's not hard to confuse me) But there is a missing capacitor in this which is now in the next schematic.
C37 I have not got back to check yet but I will look around that part for something else going on.
R23 and C39 Junction is going to IC4 pin 6.
For R6 to ground and feedforward resistor R4 I'm wondering,as it looks like this PCB is used in other pedals (quite a few components missing)maybe that R4 resistor is just bypassing the opamp and R6 is just tying the input and output to ground ??? Is this possible ??
I have nearly finished the whole trace but it looks like I have done it chunks that are too big, as looking back at what I have drawn is just a bit messy. So I am going to start again by doing smaller sections at a time, if everyone can bear with me while I end up making regular posts that just add little bits at a time then it might be easier for anyone to spot mistakes and other ideas to get this one done.
For each section I will post two pictures - one of the schematic part and the second of the pcb with the relevent tracks and components marked out.
Ok i'm off now to draw up the first section of the circuit again and see how this looks this time, back soon.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?