Building GGGs Red Fuzz (question about missing cap)

[Colman]

As the title says I'm building the Red Fuzz from the old layout since I have the pcb already as I'm gathering parts and cross checking as I always do there seems to be a 100mF cap missing from the old layout (it is present on the new layout)
Where would be a good place to tuck the cap in without disturbing the rest of the pcb?



schematic



old layout

[GibsonGM]

Schematic C8?  Where the 9V comes into the PCB, and run it to ground. you can do so on the back side if you like and if you have space for it (don't short anything out with its leads ha ha!).

[Kevin Mitchell]

What Gibby said.
Lay the cap flat under the board. Solder it onto the 9v and GND pads on the right side of the PCB, well left side when flipped over - after you solder on the wires to not make a mess of the job.
The pads are close enough that you shouldn't need any insulation on the leads to prevent shorts against anything else.

An anal-retentive note:
I'd personally use a dab of hot glue and secure it onto the PCB. It'll help keep stress off the copper traces/pads to not lift off the board if you happen to nudge the capacitor after soldering. This is an implication when soldering things surface-mount style to the foil-side of a PCB.

[Colman]

Thanks GibsonGM, that makes sense and I will do just that solder right where the 9V comes in at the Jfet.
Aharon

[antonis]

If you could wedge a 47R series resistor (between +9V and 100μF cap) it should do no harm..

[GibsonGM]

The hot glue is a great idea. I've had them pop off in the past, a real PITA...

[Colman]

Got it guys thanks GibsonGm Antonis and kevin mitchell.
Aharon

[Colman]

As soon as I started to solder the PCB fell apart traces started to lift so on to another project I'll buy one from JD.
Aharon

[mac]

One of the few pedals I kept, kind of TS.
I suggest a fet @ 4.5v source voltage (1),
and a switch to choose between leds and two series back-to-back silicons.

(1) Fet can be replaced with a NPN.  Or a LF353 dual, one of the opamps as the output buffer. No big change in tone.

mac

[Colman]

Thanks for that mac I have the LF351 and the FET,the PCB I made around 2000 and when I started on the old forum (1999).I
Probably sanded it too much to remove the mask from the PNP  and the pads and traces just lifted as soon as I touched them with the iron ,maybe too much heat I had it at 60w should 've had it at the 35w setting.I'm slowly remembering stuff.
Aharon
PS: if you can  let me know how to implement the sw for the diodes.

[antonis]

D1/D2 (pernanently soldered on PCB) should be the diode pair of the most high forward voltage drop..

[mac]

I did what Antonis posted except
- I have two options, LEDs and 1N4148s,
- and
 
  |-----|<|-----|<|-----|
--|                     |--  4 x 1N4148
  |-----|>|-----|>|-----|

to avoid a big volume difference.

Plenty of room to experiment as long as no path has a forward voltage drop bigger than the soldered LEDs.
For example a Germ can be added in the upper path to get asymmetrical clipping,

mac

[Colman]

Thank you antonis and mac, awesome help.
Aharon