This circuit was obtained in an Electronics World of 1968. The operational amplifiers ones are types of the time, no longer used today. The circuit responds from less than 20 Hz.
This circuit was obtained from an old Signalite documentation. Neon lamps are special types of the...
This circuit can be used with older tape player systems to recover media converting for digital...
Found in an EEE from 1970, this circuit supplies a voltage of 12 V DC x 10 mA current from the...