24V Ignition Project

[jetbox]

hey guys,

i was reading a thread on here a while ago where someone needed a continuous/pulsing spark for a jet engine ignitor. i have a similar need (though not for a jet )

i believe one of the suggestions for the poster i'm referring to was to use a 555 timer along with a car ignition coil to create the spark, which seems like a great solution, however, the supply voltage i'm dealing with is 24V. i'm fairly new to the electronics world, and the little bit i've read about 555 timers seems to suggest that they can only handle up to 16V. are there 555 timers that can handle more, or am i misunderstanding the specs i've read? any solutions/suggestions would be greatly appreciated!

 

[Aily Sajjad]

Hi,

you may use any linear regulator in your circuit, like 7812 to give 12VDC from 24VDc to the timer IC.

Aily

 

[The Mad Professor]

One of the more obscure methods used to drive such a coil is to connect a small DC motor (that can handle 24v) in series between it and the power supply.

Another method would be to use a suitable relay, wired in the manner of the classical style "doorbell" circuit, this is perhaps not the most elegant solution as prolonged use will eventualy cause the relay to fail but it is very simple to implement and requires no specialist knowledge of electronics.

 

[jetbox]

thanks for the replies guys

i think i'll give the dc motor suggestion a try since there coincidentally is also a need for a 24V fuel pump to be run

 

[The Mad Professor]

Crikey!.. Just how big is this turbine ?

 

[Russlk]

I don't see how the motor trick will work because the current is not interrupted. If it was, there would be dead spots where the motor would not start.

 

[chiba]

Just clamp the 555 with a 16v Zener like this:
https://www.electro-tech-online.com/attachments/twin-coil-driver-jpg.9099/

In the above circuit you could run @24v and higher provided your coil doesn't draw more than 10A accross the Darlington and a resistor inline with the coil will sort that out. Obviously you'd not need the twin coils, just the one should do.