Found in a 90s QST magazine, this circuit uses components from that time. No information is given about the transformer.
This circuit is based on an unusual component today. It demodulates a 10.7 MHz FI signal and was...
This 4.5 MHz amplifier is suitable for analog TV applications. We found it in a 1967 Philips...
The current accross the LED as function of the resistor value is given by the formulas. The...