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 small transmitter has an RF amplifier stage with coupling made from the central socket of the...
This filter configuration was found in an 80's documentation. The circuit has the frequency...
This powerful amplifier was part of commercial sound circuits from the 90s. The integrated circuit...