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.
In this circuit, the transistors are NPN for general use and the phototransistors can be replaced by...
Using a standard multimeter, this circuit from a 73 magazine for radio amateurs provides an output...
We found this circuit in a Motorola manual. The circuit employs operationals that are uncommon today...