This circuit was found in a Texas Instruments documentation from the 1980s. The circuit monitors engine temperature by warning of engine warm-up and warning when the fan is on.
This circuit is from Popular Electronics from the 90s. The integrated circuit is not very common...
This 80's circuit uses an audio amplifier to obtain a symmetrical source from a single source. The...
This circuit can be used in 0,5 to 37 V Power supplies and output currents up to 3 A. The...