Buchla 114 Touch Controlled Voltage Source

Like the 112, the 114 does NOT sense preassure - it's contact surface area. See more about this here: 112

Moist fingers also helps, but is not needed if the resistor change is made as outlined below.

diophantine on the Muffs forum found that the preassure voltage output only went up to 7 Volts, instead of the preferrd full 15 Volts. He found that changing R10 (along with R24, R38, R52, R66, R80, R94, R108,R122, R136, R150, and R164) from 470 Ohms to 130 Ohms resulted in a 12 Volt output (15 Volts being ideal). The idea being that maybe R10 (etc) should be 47 Ohms and not 470 Ohms. I followed his idea (I had already finished building mine) and added 51 Ohm resistors in parallel with R10 (etc) like he did, and now I get between 14.75 and 14.84 Volts from the preassure output. Close enough!

All of the adjustment trimmers were set to their middle position.