This circuit was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz signals and values in parentheses for FI of 455 kHz. The circuit can be adapted to other frequencies.
Equivalent transistors can be used in this high impedance and low capacitance circuit. The circuit is...
This circuit uses a modulated signal from a PLL 567 to operate safely with an infrared emitter. The...
In the figure we have a battery charging circuit for currents up to about 5 A. In series with the...