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 was obtained in a 1984 publication, but it can be assembled using BC548 for TR1 and...
This circuit was found in an American documentation from 1969. The circuit memorizes when a...
This counter was found in the November 19983 issue of Radio Electronics magazine. The power supply...