Passive conversion of TTL to NIM pulses

What is a NIM pulse ? Most of the commercial counting card on the market expect NIM pulses at their input. More precisely, NIM pulses, standing for Nuclear Instrumentation Module, are negative pulses between 0 and -800mV. However, most of the microcontroller and  some avalanche photodiode output TTL (Transistor-Transistor logic) level pulses, that is to say, typically, […]