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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Linear Regulator For Solar Cell (CB1176E)
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit for...
Schmitt Trigger Oscillators (CIR089E)
The advantages of using Schmitt Inverters (74108) or Schmitt NAND gates (4093) in oscillators lie...
Hall current monitor (CB7384E)
Found in an EDN from the 90's this circuit makes use of unusual components today. | Clique na...