- Above: A typical arrangement of an
1980s igniter unit. This device is
designed to use the signal from a reluctor type
ignition pickup to produce a well controlled
output from a power Darlington output transistor.
- "A zener is used at the coil
driver collector to limit the voltage and
lengthen the spark duration. The circuit should
operate reliably with a shorted plug, however
operating the circuit with no load connected
(plug wires fallen off, etc.) may cause a failure
due to most of the power being absorbed by the
- Coil Driver: The devices are
bipolar Darlington transistors manufactured using
Multiepitaxial Planar technology. They have been
properly designed to be used in Automotive
environment as electronic ignition power
actuators. High operating junction temperature.
Built in clamping zener.
- ECM: Also known as
Engine/Electronic Control Module,
Electronic/Engine Control Unit. This is a
separate unit that drives mostly the 1990s