Found in a 1990s American technical brochure, this circuit is intended for alarms that use as photodiode sensors. The circuit has a frequency response of up to 20 kHz. The gain is 40 dB.
Found in an Electronic Design and 1970s, this circuit uses transistors of the time. The...
We found this circuit in a 1967 Electronic design. However, it can be easily implemented even...
A rectangular signal can be generated with the figure setting. The values given in the circle...