We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The transistor must be a high voltage type and the LM3900 power supply must be symmetrical.
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...
This interesting circuit was found in a 2006 publication. It is a timer that controls the engine...
Using a 709 integrated circuit this circuit was found in the June 1972 issue of Radio Electronics...