This commercial receiver for the mid-wave range of the 1960s was found in Japanese documentation at the time. The supply is 9 V, and the configuration is superheterodyne type.
This proximity sensor was found in a 90s Popular Electronics. The base is a PLL567 that operates...
In this circuit, we have a sensor that consists of a phenolite plate with a labyrinth of fillets that...
This circuit is from a 1976 technical documentation. In it we have the way of tuning a circuit using...