This circuit aims to increase the selectivity of receivers whose FI is 455 kHz. The circuit is from 1975 documentation. The transistors can be the modern BF494 equivalents.
This circuit was found in an ancient American documentation. The integrated circuit is of the time...
Found in an older Radio Craft, this circuit covers the aerial band from 118 to 136 MHz. No...
This amplifier was found in a Radio Electronics of the 90s. The circuit uses unusual operational...