Automotive Fuse Monitor (CB26299E)

We found this simple car fuse monitor circuit in a William Sheets. The LED lights up when the fuse blows.

TTL Sports Lottery Tip (CB12367E)
This circuit draws one of the three possible guesses of a sports lottery logo: column 1, 2 or the...
Tesla Coil (CB25779E)
This Tesla coil was found in the November 1994 issue of Electronics Now magazine. T1 is a TV...
Audio Oscillator (CB457)
Hartley oscillator operates in the audio range. Frequency can be adjusted by P1 and also depends...