Well 2 transistors in parallel didnt work too well @ 2A 7V. Just get too hot one 60degC & going mutch higher, the other one lagging by 10 deg C. Will just have to find better transistors i guess.

 

Adding low value emitter resistors helps to balance the two transistors. Without those, one transistor will hog most of the current.

 

2 transistors in parallel didnt work too well @ 2A 7V. Just get too hot one 60degC

Why are you using an isolation pad under the transistors and what is it made of?
Did you use thermal grease to mount them?
Does the heatsink also get hot?

 

The insulated pads are proper heat sink insulators & the heatsink gets almost as hot as the transistors. Have some MOSFETS coming & will try them next.

 

Gas stoves/cooktops emit a burst of igniting sparks when the knob is pressed. Available at appliance parts stores in many flavors. No vibrator, no circuitries, simple self contained and low cost.

What you show is just the part that sparks. If you look carefully they have a high voltage wire, like a spark plug wire but smaller in diameter connecting the sparker to a coil and circuit in the back of the stove. All of the burners and the oven use the same single coil and circuit to start the flames.

 

Think i will go with MOSFET when they arrive, as another person on Smoke Stack forum is having beter success using a P chanel MOSFET.

 

IRF9640 MOSFETs finaly arived & apear to do the job. Guted the old vibrator & using the shell as a heat sink & all the parts fit inside nicely. It doesnt get very hot at all 28deg C on 7V & 12V. Made the set up for simplicity & easy to construct.

 

Few more.