Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s 73 magazine for radio amateurs. The operational amplifier can be a general-purpose type.
This circuit was found in a 1970 IEEE publication. The circuit functions as a voltage controlled...
Many reed switches can be wired in series to perform na efficient alarm as shoen in the figure....
This Maxim Voltage Supervisory integrated circuit can be obtained from Mouser Electronics. It has...