This small signal amplifier circuit was found in Motorola's 1969 documentation. The FET and the transistor can be of any type and is battery powered since the consumption is very low.
Found in an English documentation from 1977, this circuit activates a relay when the input voltage...
We found this circuit in a Hands On Electronics from the 90s. However, the circuit can still be...
This old diode test, from a documentation from the 1970s, uses two small 6 V lamps up to 50 mA to...