Programmable Twin T Band Pass Filter (CB6244E)

This circuit was found in an American 1980s documentation. Dual FETs can be replaced by single equivalents. Control voltage ranges from 0 to 1 V.

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Single Output Current Sensor (CB5251E)
This bidirectional current sensing circuit was found in a 2005 Linear Technology application manual....
Constant current source LM3900 (CB25176E)
This fixed current source uses a Norton LM3900 amplifier. The maximum current depends on the...
Exclamation Point Display (CB5178E)
This interesting circuit of an ancient American publication makes the pattern of an exclamation mark...