1 kHz Oscillator with Filter (CB25581E)

This circuit with signal acceptance filter was found in the June 1993 Electronics Now magazine. Other operational amplifiers can be used.

Battery Status Indicator (CB6064E)
This bargraph circuit is from an ancient American documentation. It indicates the charge state of...
Applications for the Microchip CL88020 sequential LED Driver (ART340aE)
Launched in 2017 the Microchip CL88020 is an LED driver optimized for 120 VAC input applications with an...
Telephone Amplifier with TDA7052 (CB990E)
Like the previous circuit, this is used in the analog part of the telephone lines. The same...