This circuit was obtained from Signetics documentation from the 80's. The components used are from that time. The circuit can serve as a basis for repair, maintenance or projects with modern components.
This amplifier was found in a 1957 Rayrtheon documentation. The circuit can be fitted with a BC558...
This buzzer with the 555 was suggested by a Popular Electronics from the 90s to be used as a...
This circuit with a component from the time was found in the Radio Electronics magazine of...