This small audio amplifier circuit in complementary symmetry was found in the 1974 Mullard Databook. The output pair can also be the BD135 and 136.
This circuit imitates the singing of a bird intermittently with the intermittency determined by C1...
This circuit was found in documentation from the 1950s. Note the low supply voltage. The circuit can...
We got this circuit in an old publication from 1978. The circuit uses a phototransistor and an...