This circuit was found in a 90s Popular Electronics. The circuit uses components from that time, intended to receive signals in the range of 150 to 250 kHz.
Other operational amplifiers can be used in this circuit obtained from the manufacturer's own...
Found in a 80s American documentation, this circuit pulses a lamp for optical relay tests. The...
This is a precision half-wave rectifier, suggested by Texas Instruments. Diodes are commonly used,...