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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Crystal Oscillator LM339 (CB17186E)
This is one of the possible configurations using the LM139, 239 or 339 voltage comparators. The...
Color Code Identifier (CB16353E)
Have you not yet memorized the color code used to identify resistors and capacitors? Do you have...
Solid State Relay Shield (CB9161E)
Found in American documentation from the 90's, this circuit consists of a solid state relay with...