This two-transistor circuit was found in the August 1972 issue of Radio Electronics magazine. The coil is a common IF transformer for transistor radios. The signal generated is rich in harmonics.
This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The...
Found in a 1965 Electronic Design, this circuit can be made with modern equivalent transistors. The...
In this circuit, the current in solenoid X1 can be adjusted and its intensity measured to the...