Found in 90s Popular Electronics this circuit amplifies signals over a wide range of frequencies.
For the 600 kHz range coil is formed by 35 turns of 28 AWG wire on a ferrite core with a diameter...
This electronic car lock was found in a 1988 magazine. It uses a code key that must be activated to...
With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a...