DC Regulated DC Converter (CB6099E)

This circuit was found in Siliconix documentation from the 1980s. Equivalent operational amplifiers can be used and the output current is very low.

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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...