Automotive Fuse Monitor (CB26299E)

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

Sun Timer (CB16535E)
I found this circuit in a 1998 publication, but as all components are common, it can be easily...
High Voltage Status Indicator (CB13061E)
The circuit shown in the figure can be used as an indicator of presence and high voltage in a...
VU Meter LM381 (CB19613E)
The LM381 integrated circuit is not very common today. The circuit is from an old publication, but it can be...