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931 Posts
I understand what you mean. This would be why the light-sensor tachometer 'generators' that you can get for EV's use pulses.
What I've done is a little different, and destructive (my favourite method!).
As you can guess, I was one of those kids who took apart his toys.
After doing some playing around with different voltages, I bypassed the circuit completely (see the photo below) and soldered a new power source straight to the needle 'motor' spring thingy.
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This way varying the voltage changes the reading. It's very crude I admit but it is fascinating and I reckon I could figure out a cheap way to make it work, even if it's only accurate just before red-line for safety.
What do you reckon? I hope you're going to tell me it could work, or at the very least lie to me.
Hehehe.
What I've done is a little different, and destructive (my favourite method!).
As you can guess, I was one of those kids who took apart his toys.
After doing some playing around with different voltages, I bypassed the circuit completely (see the photo below) and soldered a new power source straight to the needle 'motor' spring thingy.
This way varying the voltage changes the reading. It's very crude I admit but it is fascinating and I reckon I could figure out a cheap way to make it work, even if it's only accurate just before red-line for safety.
What do you reckon? I hope you're going to tell me it could work, or at the very least lie to me.
Hehehe.
