100 Hz Second Order High Pass Filter (CB25815E)

This filter with the 741 op amp was found in the February 1995 Electronics Now magazine. The power supply must be dual.

Transistor Tester (CB10215E)
This circuit appeared in a noverber 1962s Practical Electronics. The magazine is no more, but the...
Smoke Detector (CB5965E)
This circuit is from an American 80's documentation. The integrated circuit is from the time and...
Arbitrary Reference Inverter Amplifier LM3900 (CB4504E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...