The actuator forms part of a training system, which demonstrates the use and installation of central locking in the car. The actuator has 2 positions, one fully retracted (12V applied), and one fully expanded (-12V) supplied. So the actuator will be energized either way at all times. So basically I need to 'lock' the actuator in its position.
Originally I thought that the actuator just needs a 12V pulse, to move to its position and that's where it will stay, but however the actuator is still free to move. If I could get away with a 'pulse' then it is fine, then heat dissipated will only be for a short while and not a problem.
I was also thinking in lines of a 7812 voltage regulator / transistor combination circuit, to be able to supply more current to the actuator (without the voltage regulator getting hot).
Any further ideas ?
Thanks
Rudie