Found in documentation from 1924, this receiver has several sets of coils. Power is supplied by several batteries and listening on high-impedance headphones.
We found this circuit in a 1967 IEEE documentation. The circuit uses discrete components of the...
The astable multivibrator shown by figura 1 has a very low current drain and can be powered from 6...
This circuit was obtained from Everyday Electronics magazine of August 1974. The circuit is still...