Buffer with MOSFET (CB26318E)

This boost amplifier was found in a Popular Electroniics from the 90s. The circuit operates up to 20 MHz depending on the coils used.

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Digital Frequency Counter (CB24565E)
We found this circuit in the October 1978 issue of Radio Electronics magazine. The magazine...
Two Tone Siren 555 (CB17575E)
This siren configuration using the 555 has already been explored in other circuits on this site. In...
Simple SCR test (CB22088E)
VR can be from 50 to 220k it is recommended to connect a 100-ohm resistor in series. The lamp may...