Just reporting back that the transformer mentioned above physically fits the chassis and appears to power the circuit OK. I did notice one weird thing: When I lift the output side of the 5554N IC and connect the control pin and -Vout (pins 11 and 12), I do get the correct +/-5.0V on on the output pins 14 and 11. However, these outputs drop to +/- 3.5V when the IC is fully in circuit. Also, it takes a moment for the compression and/or fuzz effects to kick in when I switch it on. I don’t know if this is my switch or a sign that I am pulling too much current for this transformer. I need to try another switch…

Hi Ron,

Thanks so much for the info. I’ll order one and try it out.

best,

DT

Hey DW,

Thanks for posting your info. Do you get clock noise at the high speeds when there is no signal being input (like on mine)? I never did figure out how to fix that (if it is even a fault – maybe you are saying it is intentional?) l

Let me know if you need any readings off of mine.

best – DT

Hey Scruffle,

Thanks for your input. It seems plausible that this is something between the standard mummy face and the mummy face enclosure with 4049. I will dismantle it again and try to get some better shots for both sides, especially near that extra circuit.

Any thoughts on the noise I’m getting at fast rates? There is one trim pot, and I can change the frequency of the noise by adjusting it (the buzz has more low frequencies in it than I previously indicated – so perhaps it is a hum and buzz), but doing so also cuts out a lot of the effect.

best – D

Hm… the plot thickens. Well, thanks so much for checking yours – much appreciated. Some more info, if anyone is curious:

The circuitry around what I am assuming is a scratched off LM324s certainly seems similar to Version 1. The four surrounding transistors (maybe 2N4302s, but marked with only “SCOTT” on mine) also make sense with this part of the schematic.

The two similar looking transistors in the middle are also marked with only “SCOTT”. Those might be Q1-6, the 2N4302s from Version 1.

There are also two more transistors on the component side marked FS37000 327. Not sure what those are. I found some posts on this forum claiming that they are PNPs. Could those be functional equivalents to Q8, the 2N5087?

The transistor on the trace side is marked 2N5363. I guess that is Q7.

I suppose I’ll need to attempt to draw something up for this if I am ever going to get it to work. Kind of cool to have this weird anomaly though

Does anyone else out there have one that looks like this?

Thanks again – D

Hi Ron.

I am mostly curious about the 741s and the surrounding circuitry.

I believe the other two big ICs are just LM324s, which I believe are the A and B ICs in the original circuit, as seen here:

htp://www.freeinfosociety.com/electronics/schemview.php?id=380

I’m guessing EH just scratched them off to protect their circuit from being copied?

But there are no 741 op amps on the original, not from what I have seen from Googling at least.

Some members of one of the popular online stompbox forums made a clone of the mummy board. It looked similar to mine, but omitted the section with the 741s.

Mine also has a different configuration of trim pots (I have one – others seem to have three or so).

best – D