Ok... now it's getting interesting! So I don't really expect this to solve all your problems as your voltages are still off but.... It appears your output wire is somehow connected to ground??? Does that jack socket have a switched contact on the tip? I see 2 legs but is one of those legs connected ...

ok....I've compared the layout to the schematic and it matches so the problem isn't there. I also can't see anything else obvious in your build so refer to my previous post about that. If it comes to a rebuild I suggest building my layout attached. It follows more conventional design rules and is mu...

Hi snk Something seems horribly off with those voltages. Pins 1,2,3,5,6,7 of both IC's should be around half supply like microbailey said.....somewhere close to 0V. I'm guessing you have a misplaced component(s), a short, not fully cut through cuts or lastly a bad component. Try taking out the IC's ...

So far so good. Post measurements for all the pins on both ICs. It might give us an idea of where the problem is.

Sorry to hear! Always when you need them eh? For future reference, IC pins are labelled as follows 1-8 2-7 3-6 4-5 ...it'll make for better understanding if this convention is followed. Is pin 4 really at +(positive) 15V? It should be at -(negative) 15V. I suspect your pins 5, 6 and 7 are off too. I...

Cool. I'll have a look now. In the meantime can you post voltages from all the important areas? IC pins, v+, gnd, v- etc.

I missed this bit...so it was working before you boxed it? In that case the problem may be something silly then. You're wiring diagram works so maybe you made an error when you were wiring it into a box, something is now shorting against the box or a wire came loose/broke when soldering in the box.

Wiring looks fine. I'm more concerned about your power supply. This circuit calls for a bi-polar supply...hence the V+, GND and V-. Is your 15V supply bi polar? Is it DC or AC? If it's unipolar then you need the daughterboard. If its AC then you need to rectify. Finally if it is indeed a bi-polar DC...

Scheme is correct and caps are ordered as built by EQD. I did the trace based on photos by a member at Tagboard FX. Here's a pic of the trace I did using DIYLC. Although it is interesting that the last 2 caps are reversed compared to the univibe. Smarter minds may tell us what, if any, difference th...

Cheers Bugg! I'm not looking for any credit...I just tidied up what was discussed earlier. You took it to the next level and gave us something we can actually play with so thanks for that!

Can a mod PLEASE fix the [traced] link to point to something useful?!?

ok...for the sake of CLARITY ... Are we now saying that mine (and Buggs) schematics are correct as far as the ACTUAL Friedman pedal goes? (identification of dual diode package not withstanding) ...and that bajaman has come up with the first MODIFICATION? Apologies for shouting but this thread sudden...

Yip...that routing pic shows placeholders for what looks like trimmers. You can see them very briefly in the video as well. There's definitely more going on under that PCB that we know about. Starting to see more black solder masks these days. Is that their way of making traces more difficult I wond...

Hi Rob. That layout is based off my schematic on page 8 and also matches Bugg's with which he made his PCB's. It's been built by a few people now with no issues other than oscillation at max settings (which pakrat inferred his unboxed original did too). Your video definitely points to either a build...

Screen grab of the PCB being routed. That T0-92 looks like voltage reg to me.

I believe (this is purely my own personal opinion) that the dev team aimed to create a working DIY-project, not a 100% replica of the original circuit. For a pedal that will be most likely powered with 9-12-18 Volts; a 1N5817 should be perfectly adequate - and by all means most easily upgraded to 5...

Happy days! Thanks to all who contributed and especially to pakrat for adding the final pieces to the puzzle.

Cheers

Ciaran

pakrat wrote:Now just waiting to see if anyone needs anything else checked against the original before I button it up.

I think that's it. If you're happy to call it verified I'll post the final schematic and Alex will post his layout at TagboardFX.

Going over the latest scheme it does have one error. R10 should be 22k instead of 10k. Other than that, it is correct. I may check it against the PCB tomorrow to be 100% Copy/Paste error sorry. Alex pointed it out to me yesterday when he sent me his new layout for another pair of eyes. I've held of...

Excellent! All we need now is your opinions on its sound comparison to the real deal and we can call it traced

Latest version as verified by pakrat and Gavin at TagboardFX "as functioning."

bmx..the presence pot appears to be coming off C13 in JOK3RX's pics so I left it as is. I think this is the last wobbly area of the trace so if anyone cares to confirm?