Found in a 1970 documentation, this circuit makes use of 741 operational amplifiers that are common today. Note that the power supply must be symmetrical.
This circuit consists of a relaxation oscillator that generates high voltage pulses in a flyback...
This circuit that converts very low currents into voltage was obtained in the 80's used component...
The purpose of the strobe circuit in this sensor amplifier is to reduce consumption. The circuit is...