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.
This circuit for signals up to 30 MHz can improve your reception in the medium and short-wave...
This circuit can be used as a shield for transmitting the temperature of a sensor. The circuit is from...
This astable multivibrator follows the traditional configuration for use as a signal injector, found in...