This amplifier with the LM1098 and LM101 by Motorola from a 1990 manual can be designed with more modern operations. The bandpass for small signals is 3.5 MHz and the power range is 250 kHz.
The configuration shown is from the 1994 Linear Applications Handbook, published by National...
This switching circuit for analog signals is from a 90’s Electronic Engineering. The components...
This circuit for recognizing a frequency with a narrow range was found in Radio Electronics...