This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the selected frequency. The power supply must be symmetrical.
Although not using transformers, this amplifier may have difficulty mounting if the original...
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...
We found this circuit in an old documentation, but it can be easily assembled, as it is based on...