Boards in 3 GitHub repositories, designed in KiCad, that use the LM324D by Texas Instruments (-1.5V~16V 0℃~+70℃ 1.2MHz 20mA 20nA 2nA 35nV/√Hz@1kHz 3V~32V 3mV 4 500V/ms 700uA 7uV/℃ 80dB EMI filtering/RF suppression SOIC-14 Operational Amplifier ROHS). See how each wires it, with its parts, size, README and files; the LM324D’s symbol, footprint and pinout are on its own page.
Hamlob/Monotron_CV_mod
A modification for Korg's Monotron Delay, which makes it accept standard Eurorack CV voltages (Pitch, Gate and Cutoff CV). The mod also provides an option to power the monotron via micro-USB.
SebastianRoll/galvo-laser-preamp-pcb
Printed circuit board for galvo preamplifier
