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.

Gas ignition (CB7075E)
This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a...
RF Power Meter (CB4885E)
This RF wattmeter was found in an American 1980s documentation. The components are common and the...
Signal Follower with Old Transistors (CB12922E)
This signal follower, from a publication from the 1970s, uses old germanium transistors such as...