Automotive Fuse Monitor (CB26299E)

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

Audio light (CB8433E)
This audio level indication system for microphones was found in Radio Electronics from the 90s....
2 Transistor Signal Follower (CB18410E)
This simple audio and RF signal tracker was found in a Japanese publication in 1967. The...
Video amplifier (CB8743E)
Found in a 90s Popular Electronics, this circuit is intended for amplifying analog video signals....