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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Code practice oscillator (CB8697E)
This circuit was found in a 90s Wels' Think Tank. The frequency depends on C2 and R3. The handset...
LM3900 Voltage Controlled Oscillator (CB14198E)
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. The...
Zero Crossing Switch (CB15063E)
This zero-crossing switch circuit triggers an SCR when the input voltage goes through zero. The...