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.
This simple 741 circuit was found in the August 1993 Electronics Now magazine. The source must be...
The operational amplifier used is a double 741. The power supply is symmetrical, and the gain is...
This circuit was found in a Hands-On Elctronics from 1987. The field effect transistor admits...