Glowplug Driver for R/C

Project for your Flightbox.

Q1 is a PNP power transistor/switch with a TO-220 case, 6A, 80/100V, 65 watts.  Don't be afraid to experiment, and don't forget the coolrib on the TIP42, it may be needed.  I strongly recommend a powersupply if you're gonna experiment and turn up the voltage slowly while watching the ampmeter.  My own experiments resulted in 3 burned out glowplugs, 2 TIPs, and 2 NTE123AP.  Q2 is a NPN silicon, AF/RF Amp/Driver, transistor to drive Q1. If you substitute, stick with the 'driver' type, other may burn-out the very second you apply power.   Again, try using whatever you have in your parts-box first, but try to match the current/voltage parameters as close as you can and make sure it is able to drive Q1. Whatever transistor you use for Q1 or Q2, watch the orientation of the the emitter, base and collector and don't assume it is the same as the original or as shown in the component layout. The tab for the metal case transistors (Q2) is always the emitter.  Remember, Q2, as mentioned before, should be a driver-type-transistor (or close to it) in order for it to supply enough current to Q1.