RC1 is used to help suppress high voltage spikes that can destroy the power transistors. If you use a MOSFET or IGBT instead of a bipolar transistor like the 2n3055, you should also add a pulldown resistor of about 10k between the base/gate pin and GND. Further protection methods are outlined lower down this page and in the comments. Ones with higher voltage ratings will be less likely to be damaged by spikes. Pretty much any power transistor, IGBT or MOSFET can be used in this circuit as long as it is rated for at last 5A and 100V. While these are cheap and high temperature tolerant, they are susceptible to voltage spikes caused by the inductive nature of the load (ignition coil). This driver circuit is based on the commonly used 2n3055 transistor due to it high power switching capability. Click the link to check stock.Ģn3055 Power Transistors or HV MOSFET or IGBTġN4007 will do but preferably a Schottky Diode We have some compact induction coils available for sale for under £20. It is not essential to use two 12V batteries like shown in the circuits shown below, but it will allow you to obtain bigger sparks. Standard ignition coils can be obtained from most car parts stores for around £25.
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