Have a couple of manual testers, but would like to build an LED
in-line unit to test spark on two, four, and six cylinder outboard
motors. Anyone have a design or know where such a unit can be obtain?
tks, alp

"edolo" wrote in message
...
Have a couple of manual testers, but would like to build an LED
in-line unit to test spark on two, four, and six cylinder outboard
motors. Anyone have a design or know where such a unit can be obtain?
tks, alp

Would be probably as cheap and even more handy to just get an inductive
pickup timing light.

know any LED's which can handle 12,000volts?
"edolo" wrote in message
...
Have a couple of manual testers, but would like to build an LED
in-line unit to test spark on two, four, and six cylinder outboard
motors. Anyone have a design or know where such a unit can be obtain?
tks, alp

"news.wildblue.net" wrote in message
...
know any LED's which can handle 12,000volts?
"edolo" wrote in message
...
Have a couple of manual testers, but would like to build an LED
in-line unit to test spark on two, four, and six cylinder outboard
motors. Anyone have a design or know where such a unit can be obtain?
tks, alp



All with a little added circuitry.

news.wildblue.net wrote:
know any LED's which can handle 12,000volts?


Why would it have to handle 12,000 volts?

that's about the firing voltage of a spark plug.

"basskisser" wrote in message
ups.com...

news.wildblue.net wrote:
know any LED's which can handle 12,000volts?


Why would it have to handle 12,000 volts?

news.wildblue.net wrote:
that's about the firing voltage of a spark plug.

Yes, it is, but that doesn't mean the LED has to handle that 50,000
volts. Think resistance.....

You can't add resistance to the circuit and make an led light up from a
spark. The led needs a certain amount of current at around 1 volt.
There is not that much current in the spark. The coil trades currrent
for voltage when it steps the voltage up to that many volts. You would
need to build a trigger circuit tha detects the spark and the powers
the led.

basskisser wrote:
news.wildblue.net wrote:
that's about the firing voltage of a spark plug.

Yes, it is, but that doesn't mean the LED has to handle that 50,000
volts. Think resistance.....

"basskisser" wrote in message
ups.com...

news.wildblue.net wrote:
that's about the firing voltage of a spark plug.

Yes, it is, but that doesn't mean the LED has to handle that 50,000
volts. Think resistance.....

How much resistance would you need? Series, parallel?

Why in the world go to all this trouble when neon bulb spark detectors
are under a buck apiece?

Terry K