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 circuit in an American 1980s documentation. The circuit can be assembled with modern...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...
This circuit provides a high intensity pulsating signal to a speaker. The circuit is from an...