Turn me on

[AvionicsMaster1]

The reason I used a 5 volt relay is because that's what I had available. I recently bought a 12 relay to try. Thanks for the transistor mosfet suggestion. I haven't had time to try it yet.

I did monitor the power supply while the circuit was operating. I used a fluke meter that could catch peak voltages. During the horn on cycle the power doesn't drop off more that a few hundred millivolts.

I don't have decoupling caps at the chip but I'll try that also.

Thanks for all the ideas.

[Ioannis]

There are N-Channel mosfets with low threshold level, the so called logic Mosfets.

Like the , BUK9575, 12N06L, IRF3205

Also if anyone interested in P-channel a good one I tested recently is the IRF4905. An excellent P-channel Mosfet.

Ioannis

[AvionicsMaster1]

I thought I'd finished this out but something didn't work.

Thanks to Henrik, using the transistor and 12 volts to turn the MOSFET on does work; most of the time. Periodically it will skip parts of the routine but restart at the right place. I feel this could be due to the power supply and all I need is to find some filter caps.

Thanks for all the help.