EMG-81

[straylight]

I have one hooked up right now. Mostly for laughs, maybe a bit for science. Nomally I'd load a pickup with 200kOhm and 470pF to simulate a guitar and cable, what am I doing here? Same capacitance and 25kOhm

[antigua]

Mar 7, 2020 19:32:25 GMT -5 straylight said:

I have one hooked up right now. Mostly for laughs, maybe a bit for science. Nomally I'd load a pickup with 200kOhm and 470pF to simulate a guitar and cable, what am I doing here? Same capacitance and 25kOhm

Is the overall load 12.5k since the 25k tone and volume pots are connected in parallel?

[straylight]

It makes very little difference what load i throw in front of them because active, I got the same shape trace with 200k, 20k and 10k.

But I'm running the signal generator on the scope at 20% max amplitude to avoid clipping, and I get this trace vs a dimarzio Evolution done at 100%. It's a bit mad. And has a mid hump like a boss SD-1.Mostly I need to collect my thoughts and work out if i screwed up somehow.

[straylight]

This looks consistent with electrosmash's teardown and simulation

www.electrosmash.com/emg81

[antigua]

All the plots Ive seen of EMGs depict a large arc like that. EMG makes some models that are supposed to sound "vintage", they might have more of a classic resonant response.

[stratotarts]

Yes, it's due to the smallish capacitor values between the coil and the op amp input inside the pickup (input DC blocking capacitor). It's unlikely to be a design mistake, someone thought it sounded good.