Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses coils and transformers hadr to find in our days. The circuit is destinated to receive MW stations.
Figure bellow shows another circuit that allows adjustments in the duty cycle of the output...
This TTL siren is formed by two oscillators using each two Gates of a 7400. Frequency or the...
By the characteristics, this circuit can be used as command of triac by direct current, which is...