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.
This control circuit or reversible contactor was found in a 1967 General Electric manual. The...
We found this circuit in a 1987 publication. Through a relay, it controls water valve solenoids at several...
The figure shows how to use a varicap in a conventional tuning circuit. The circuit may be an...