This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
We found this crystal AM radio using a germanium diode in a Japanese magazine in 1967. The circuit...
This filter was found in Radio Electronics, and its configuration can be applied to any...
This circuit was obtained in an old English magazine (TSI) 1998 and consists of a Schmitt trigger...