This amplified metronome was found in a 90s Popular Electronics. The circuit is powered by a 9 V battery but will also work with 6 V of 4 standard batteries.
This 45 to 90 Hz hum elimination circuit was obtained from a 1980s documentation. The operational can...
This circuit is suggested by the Optoelectronics Sourcebook by Texas Instruments when AC signals...
This amplifier for a sinusoidal function generator uses a 741 integrated circuit. The circuit is...