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.
This circuit for link or alarm was found in the Encyclopedia of Electronic Circuits Volume 5 of...
This 9-pixel circuit has been implemented with 9 LDRs and can be coupled to a processing system for...
The purpose of the diode in this oscillator circuit is to limit the amplitude of the output...