Automotive Fuse Monitor (CB26299E)

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

Amplifier For Inductive Pickup (CB13751E)
We found this amplifier circuit for inductive audio pickups in a documentation from the 70s. The...
AC Amplifier TL061 (CB14495E)
The circuit is from Motorola's Linear Databook from 1990, but the configuration is current because...
MW Radio EB-165 (CB18354E)
This 6-transistor commercial radio with 6 V supply was found in a Japanese publication from the...