We found this preamplifier with 70 dB gain for microphones in American documentation from the 90's. Consumption is low and equivalent transistors can be used.
Found in a 1964 Electronic Design, this circuit generates 1 A pulses with durations from 100 us to...
This low-current control circuit has a lamp as a load, but can have other types of devices, such...
This circuit was found in an old American optoelectronics manual. The circuit makes use of an...