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.

Amplifier Protection (CB24882E)
This circuit is used to protect an amplifier from excessive power output that would cause problems for...
Assisted Ignition 2 (CB4349E)
This circuit was found in a French magazine Toute LÉlectronique from 1978. Transistors are not...
Photocell powered frequency standard (CB20521E)
This circuit was found in documentation from the 50's. The circuit uses transistors of the time...