This circuit was found in the Electronics Experimenter Handbook from 1991. The sensor is a diode and the circuit has a relay according to the voltage used in the supply.
E) This soft start dimmer was found in a Motorola documentation from 1968. However, it can be...
This circuit source a voltage proportional to the number of the input pulses. The circuit has a...
This circuit was obtained from an 80s factory manual. The integrated circuits used are uncommon...