The transistor on this mixer can be any general-purpose transistor. The number of entries can be changed. We found it in an old documentation. Input and output cables must be shielded.
This small audio amplifier circuit in complementary symmetry was found in the 1974 Mullard...
This circuit that converts light intensity into frequency was found in Radio Electronics magazine from...
We found this circuit in Radio Electronics magazine from October 1966. The circuit uses a 15 V...