The 1st issue - decreased overall volume compared to the non-compressed settings - can be remedied with a 100k, or 50K, pot where the 82k resistor sits, or by simply jumpering that resistor (R16) and lifting the ground on R17 (On the circuitboard of my guitar R12 is not present).
The 2nd issue is there is no way to control the amount of compression in the circuit. Although the instructions that accompany the guitar tell you it can be adjusted with a trim pot (1k variable resistor on the PCB, R23), that pot really is a "set and forget" that works best in the 12 O'clock position and does nothing to vary the amount of compression. And there is an insane amount of compression in this circuit.
If you compare the E1 schematic to the DynaComp, you see the E1 has a 33k resistor from the Emitter of Q5 to pin 5 of the IC, where the Dyna has a pot (in front of a 27k resistor on electrosmash schematic, and no resistor on the GG schematic) going to the same pin. I suppose Roger liked a super-smashed sound, so the designer left out a real sensitivity control, but I find I prefer to be able to reduce (or increase) the effect, depending on the song, etc. So then the question becomes how to implement the mods without compromising the integrity of the pickguard and circuit board.
https://www.intersil.com/content/dam/In ... 3080-a.pdf
https://www.experimentalistsanonymous.c ... AN6668.pdf
Hi John, thanks for your suggestion; much appreciated. Take a look at the pic and you'll see the controls are hard-soldered to the circuit board, so it's not possible to install a stacked pot.
What I am considering is having a spare lower guard made so I can mod without destroying the original. In that case I may use a couple mini-switches to give me some more options as presets for higher output and stepped levels of compression.
I did reduce the compression about 25% by inserting a 150k resistor in series between the 33k resistor and pin 5 on the 3080. And I increased the output of the E1 with a 10K in parallel with the 82k to the output, leaving R17 (10K to ground) in the circuit. Totally easy to remove these mods to put it back to original spec. So far I'm finding it more useful than stock.
Is it adjusted with the guitar plugged in and compressor in one of the 4,5,or 6 positions?
The spec for it is 2.5v from the factory. Where do I put the voltmeter leads to check this?