In the figure we have a good rectangular signals generator with several frequency bands. The circuit is based on old logic but can be implemented with modern equivalents.
This 2 meter (144 MHz) preamplifier is intended for use with portable transceivers. The...
This circuit compresses the dynamic range (amplitudes) of an audio signal. The circuit is passive and...
We found this circuit in a 1995 paper. The reed switches are surrounded by a few coils of coarse...