electric eel et. all

Unfortunately, its not ours.  In a previous era, we had an exhibit which translated the EEL's output current to an audible pulse, which the public could hear.  Of course, those days are gone... 

There is one main problem: each user has a different electrical resistance.  What is normal?  Even upon measuring one's self (thumb to forefinger), you can get anything from 40k ohm, to 4m ohm (ahem, based on my own)!  

So the question is, at what strength do we make the eel v2 circuit at:  40 volts, 60 volts, 160 volts!??  How moist will the users hands be?  With what surface area & pressure will each user touch the probes?  Will The users go directly from the salt-water touch-tidepool to the exhibit!!??  Well, obviously, we just need to guestamate this one...

As of of now, it's a coil based unit utilizing an npn TV cathode deflection transistor.  Its under stress testing right now.  The first crack had problems with thermal runaway i.e. everything would work perfectly for half an hour, until one under-spec'd capacitor would overheat and pull current. anyhow, thats the update!