This limiter circuit provides a constant amplitude signal at frequencies of up to 100 MHz. The circuit operates with 9 mV input signals and was found in a 1969 US documentation.
This circuit used in instrumentation is suggested by National Semiconductor, now Texas Instruments and...
The presented circuit can be implemented with a BC548 and for larger currents a BD135 can be used....
This remote control receiver via the power grid appears elsewhere on this site from other sources....