This passive circuit was found in a 1980s documentation. The circuit serves to indicate the balance or balance between the channels of a stereo amplifier.
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...
This circuit checks the oscillation capacity of a transistor. The circuit can be used with fixed...
The integrated circuit used in this 80's temperature control is not very common today. The load...