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 transmitter has a range of approximately 50 meters and operates in the FM range with a...
This old circuit for circuit breaker cars was found in a 1963 publication. The transistors are...
We found this circuit in a European publication of the 1980s. The transistor could be the BC549. The...