Sensing RPM on a small gas engine (Briggs&Stratton 8hp)]
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might want to put voltage divider on ignition primary
richard
Original Message
From: "histatmac" <gary.shelton@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, April 15, 2002 10:58 AM
Subject: [noparse][[/noparse]Fwd: Re: [noparse][[/noparse]basicstamps] Sensing RPM on a small gas engine
(Briggs&Stratton 8hp)]
> Used to have a "spark detector" that was used for troubleshooting
> ignition problems. I think it had a transistor with a floating
> base at the end of a two conductor cable. The high voltage
> from the spark would "fire" the transistor when it was close enough
> to be affected by the electromagnetic pulse. That would then pull
> a resistor down. The thing worked pretty well and didn't have to be
> in contact with the high voltage plug wire.
> HTH
> Gary
>
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richard
Original Message
From: "histatmac" <gary.shelton@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, April 15, 2002 10:58 AM
Subject: [noparse][[/noparse]Fwd: Re: [noparse][[/noparse]basicstamps] Sensing RPM on a small gas engine
(Briggs&Stratton 8hp)]
> Used to have a "spark detector" that was used for troubleshooting
> ignition problems. I think it had a transistor with a floating
> base at the end of a two conductor cable. The high voltage
> from the spark would "fire" the transistor when it was close enough
> to be affected by the electromagnetic pulse. That would then pull
> a resistor down. The thing worked pretty well and didn't have to be
> in contact with the high voltage plug wire.
> HTH
> Gary
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>