This notch filter was found in National Semiconductor documentation from the 1980s. Operational amplifiers are from that era. The configuration can be adapted to use modern operational amplifiers.
This circuit was obtained in a 1978 magazine, but it can be easily assembled. What the circuit does...
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...
This circuit that generates signals between 1.5 and 2 kHz was found in a documentation from the...