Raytheon's used operational amplifier is rare today, but the configuration can be adapted to use modern operational amplifiers.
This filter is inserted between the interfering device and the interfering device. The coils are...
June 2017 - Kemet T521's new high voltage capacitors with capacitances up to 330 uF and voltages...
We found this circuit in the November 1974 Radio Electronics magazine. The frequency depends on C1...