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souNdguy
04-26-2003 21:57:36
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Re: Re: Re: 6 Volt Coil in reply to question Dell----Rob, 04-26-2003 20:28:53
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Actually you are on the right track, just missing a bit of electrical principle. That circuit isn't a short.. close, but the primary side of the ignition coil provides a a couple ohms of impediance, and while it's at it, generates a magnetic field. .when the points open, that mag field colapses.. the mag field continously colapsing and and being generated induces current on the secondary of the transformer, and provides for the sparkies.... Think of a transformer for ac current... the sine wave is continously hiting positive and negative peaks, mag field is what induces the current on the secondary of the transformer..etc. On the tractor ignition we are just dealing with cd, and a coil, and points. Coils have neat qualities.. induction is a fun study... this quality is measured in henry's Basically an inductor oposes the change in current in a circuit, as current changes ( drops ), the mag field colapses a bit... this leads to reverse . or back emf ( electro motive force... Capacitors work in a similar principal concerning voltage, and store a potential charge, and oppose a voltage change in a circuit, by absorbing and discharging voltage.. that is why a capacitor 'filters' half wave DC to a smooth dc output without ripple.. the cap is discharging potential during the gaps in the peaks of the waveform, and then charging back up on the next peak, etc. A neat trick is to take a large value 12v capacitor.. like 6800micro farads or bigger, and a small 12v lightbuld, and connect in series with a 12v battery... observe capacitor polarity or you can damage the oxide layer in the cap... You'll notice when you connect it, the light comes on as the capacitor is charging, as current is flowing to charge the capacitor.. but when the capacitor reaches full potential, current flow tapers off then stops, thus the light goes out... You can discharge the cap across the light, then do it again, etc... Lots of fun stuff to do in electronics. Another fun project is to take for instance, a 12v battery and some 12v large value caps, and wire them in a way, that all the caps are parallel to the battery and so they charge, and then have it setup with a bank of switching transistors to connect the caps in series.. say you have 4 caps, all charged to 12v in parallel, then swap them over to series, then you have 48v, have one cap setup on the output that is rated for 48v, it charges from the bank of 12volters in series, then have the circuit switch back to charge the bank of 4 caps again.. do this real fast over and over ( that's why you use transistors.. they are the ultimate in fast switches... ) and walla, you have a 12v powered 48v output charge pump... could also be done with transistors in a r/s flip-flop circuit, make ac waveform from the dc source, then use a step up transformer, then rectify the output, and wala, you have a 12vdc powered 48v output inverter.. etc... dozens of other ways to make power supplies both step up and down... PWM's etc.. for those of you electronically inclined, you'll notice i heavilly generalized on the requirements for these circuits, but they were for conversational purposes only...
Soundguy
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