Total know nothing here :)
I have an idea but could do with some help finding the parts to work out a
first off I need to clip a wire onto a HT lead on a car engine which will
give me a pulse once every 4 turns of the engine (or I could put it on the
main feeder lead which would then pulse every turn either way is fine )
So this HT signal would need to be converted to a safe usable voltage: I am
thinking small transformer with a voltage regulater or a optical device or
even getting the signal from the low voltage area of the ignition (not ideal
I want the unit simple to clip on or off and for any make of car).
Next this signal would need to be fed to a PWM, I am thinking that I would
need to change the pulses to a variable voltage which could be used to
control a simple 555 based pwm circuit. what would be the simplest way of
Then the output from the PWM would need to be fed into a transistor capable
of running a motor of around 20amps.
So the block diagram would look something like:
HT pickup - useable pulse - analogue signal - PWM - transistor - motor
as you may have guessed I want a motor that runs faster and slower dependant
upon the rpm of the engine.
thanks in advance for any help.