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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Variable oscillator for code practice (CB7317E)
This circuit is from Popular Electronics from the 90s. The integrated circuit is not very common...
Symmetrical Regulator LM380 (CB5879E)
This 80's circuit uses an audio amplifier to obtain a symmetrical source from a single source. The...
Voltage Regulator Using the 723 IC (CB417)
This circuit can be used in 0,5 to 37 V Power supplies and output currents up to 3 A. The...