The presented circuit makes use of a common operational amplifier that must be powered by a symmetrical source. R resistors from 10k to 1M determine the gain and compression of the signal.
We found this circuit in a 1995 documentation. Powered by batteries, it uses a telephone capacitor as a...
This circuit transmits beeps to receivers tuned in a wide range of frequencies placed nearby. The...
Circuits and devices can be tested using the tester. The visual indication of the state of the...