The integrated circuit used in this' 90s amplifier is not very common today. The supply is 24 V, the gain is 50dB and the input resistance is 100 k. The circuit is from an old circuit manual.
This circuit safely replaces common locks, since, instead of the key, the opening is made with the...
This amplifier, common in 1986, uses a hybrid integrated circuit that can offer some difficulty to obtain...
This circuit, found in a 1979 documentation, consists of a small inverter that applies a voltage to...