MC3334 based ignition

[rr]

The problem with a high-voltage MOSFET is the RDSon. The
losses can be higher than expected. And they are expensive.

Figure at 5-amps current and 0.4-ohm RDS, that's a 2-volt
drop across the switch. A bipolar will be about 0.7-volts.

BobR.


Mihai Alexandru wrote:

> diy_efi at efi332.eng.ohio-state.edu
> MC3334 based ignition
>
>   Hello,
>
> I intend to build an ignition based on the MC3334
> chip.
> I have searched the efi archives and found some nice
> info about this, but I still have some uncleared
> points that I hope someone might answer:
>
> 1. Did anyone use a power MOSFET instead of the
> MJ10012 ? And if so, which were the changes in the
> schematic from Motorola? I intend to use an IRFP450.
> 2. How should I make the reluctor pickup?
>
> Thank you very much,
>
> Mihai
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