How would I go about amplifying the AC current reading that I'm picking up from the outside of a spark plug wire. I'm building a tachometer.
I've considered a transformer then adding a rheostat for calibration.
How would I go about amplifying the AC current reading that I'm picking up from the outside of a spark plug wire. I'm building a tachometer.
I've considered a transformer then adding a rheostat for calibration.
I've enjoyed island life for 17 years. That's 13 years more than the Confederacy was around.
RIP Albi
When do you tell a woman you're a ham?
It's a jungle out there. Many EQ stupidly with poor articulation.
~TKX
YIAH
"And, of course, the Gym Teacher being his usual self."
W3WN
"The enablers ride on the top of the pile."
WZ7U
I should add, it's 1 cylinder.
I've enjoyed island life for 17 years. That's 13 years more than the Confederacy was around.
RIP Albi
When do you tell a woman you're a ham?
It's a jungle out there. Many EQ stupidly with poor articulation.
~TKX
YIAH
"And, of course, the Gym Teacher being his usual self."
W3WN
"The enablers ride on the top of the pile."
WZ7U
Isn't that just a simple induction sensor clamped to the spark plug cable?Originally Posted by KG4CGC
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Yes, and one would need to step up and condition the voltage - rather than the current - to get a usable reference. Something like a JFET would work nicely without excessively loading the pickup coil and reducing its output. For TTL gating purposes you're aiming for 4.5-5.2v on peaks.
"Everyone wants to be an AM Gangsta until it's time to start doing AM Gangsta shit."
Add turns to your pickup inductor.
Assuming you're not using a sealed unit. Some of the setups built for the auto-repair community cannot be disassembled for modification. I have an old Sears diagnostics meter that includes a tach function and most of my motorcycle ignition systems don't generate enough high voltage to get an accurate reading. I had to go to a "Daytona" brand accessory digital tach (which triggers off the coil primary; switched 12v) in order to get a usable low-RPM reading for purposes of carb synching, idle-mixture settings and so forth. Frustrating, as the Sears unit's pickup merely clamps around the #1 plug wire...and I had to add a pigtail to the ignition circuits of each bike where the Daytona will be used.
"Everyone wants to be an AM Gangsta until it's time to start doing AM Gangsta shit."
Ah, I'm using coiled wire. Insulated probe wire.
I've enjoyed island life for 17 years. That's 13 years more than the Confederacy was around.
RIP Albi
When do you tell a woman you're a ham?
It's a jungle out there. Many EQ stupidly with poor articulation.
~TKX
YIAH
"And, of course, the Gym Teacher being his usual self."
W3WN
"The enablers ride on the top of the pile."
WZ7U
Just pull back the spark plug boot and connect a lead directly to the terminal of the plug wire. That should give you plenty of voltage...
All the world’s a stage, but obviously the play is unrehearsed and everybody is ad-libbing his lines. Maybe that’s why it’s hard to tell if we’re living in a tragedy or a farce.
Next you'll tell me to touch my tongue to it.
I've enjoyed island life for 17 years. That's 13 years more than the Confederacy was around.
RIP Albi
When do you tell a woman you're a ham?
It's a jungle out there. Many EQ stupidly with poor articulation.
~TKX
YIAH
"And, of course, the Gym Teacher being his usual self."
W3WN
"The enablers ride on the top of the pile."
WZ7U
Toroid?
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