This simple two-transistor FM transmitter was found in the November 1991 issue of Radio Electronics magazine. The circuit has a 2 + 2 turn coil of 28-gauge wire with a diameter of 1 cm.
This circuit is from a 1974 publication, but it can still be easily assembled today with BC548...
Found on Popular Electronics in the 1980s, this circuit detects a change in air pressure using a...
This 3-transistor amplifier stage was found in documentation from 1963. The transistors are made...