# How can I make a motorcycle CDI (capacitor discharge ignition) using a power MOSFET?

#### Noxge B

Joined Feb 28, 2018
4
Is there any way to make CDI (capacitor discharge ignition) using power mosferts,Ive searched on google but it only shows using SCR

#### Dodgydave

Joined Jun 22, 2012
9,935
You need to have an oscillator to make the HV, and a capacitor to store it, most cdi's use a Thyristor to fire the capacitor across the coil, it's the best method as it turns itself off when the capacitor is discharged ready for the next trigger pulse.

#### crutschow

Joined Mar 14, 2008
26,968
Why do you want to use a MOSFET?
It has no significant advantage over an SCR, and has some disadvantages.