30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Window comparator with lamps (CB5077E)
Instead of LED bulbs, LEDs with a series 470 ohm 1k resistor can be used in this 80's circuit....
Diodo OR Gate (CB19881E)
In the figure we have the way to implement a 3-Input logic function OR inputs using common diodes....
Voltage Controlled Amplifier (CB24750E)
This circuit is from Radio Electronics from July 1983. The operational amplifier is of the...