Direct Voltage Adapter - Honda Motorcycles - FireBlades.org
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post #1 of 2 Old 02-18-2011, 6:07 PM Thread Starter
 
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Direct Voltage Adapter

Just throwing this out there for a FYI and something someone may pull up one day in a search.

The DVA or direct voltage adapter that Honda calls for when testing Direct Voltage and signals from the Ignition Pulse Generator is nothing more than a capacitor with a diode to prevent the capacitor from draining out until you reset it.

There's even a guy on Ebay selling these for 27 dollars and you can make one for next to nothing, if you even need it at all.

Parts you need
1N4002 diode
https://www.jameco.com/webapp/wcs/st...10001_76962_-1
220uF 50V capacitor
https://www.jameco.com/webapp/wcs/st...0001_158407_-1
Alligator clips
Wire
Soldering iron
Solder


Get a red alligator clip, and a black one, each with about 12" of wire on them. Get a 1N4002 diode, and solder it to the red alligator clip wire with the stripe facing away from the clip. Solder the stripe side of the diode to the positive pin on a 220uF 50V capacitor, and solder the other pin on the capacitor to the black clip wire.

Connect the two clips to what you want to measure, watching for polarity. Connect your volt meter to the capacitor. The diode allows the capacitor to charge, but doesn't let it discharge. This lets the capacitor charge to the highest voltage that is input without draining back down when there's less voltage. That capacitor's voltage will be the highest voltage that is applied. Add 0.7 volts to whatever your volt meter displays, since the diode will drop any voltage by that amount.

That capacitor will hold that voltage for a long time, so to make another reading, touch the two pins of the capacitor together with a screwdriver.

If you want to make it elegant, connect the two pins of the capacitor together through a momentary contact push-button switch and a 100 ohm resistor. Press the button for 5 seconds to discharge the capacitor.


I can't take credit for writing it, but it took a bit of searching to find it.

For the most part though, digital meters are fast enough for you to catch the highest reading before the screen refreshes. This is for the electrical noobs that think they'll need to buy a tool to test the ignition.

Oh I forgot to add, change your meter scale over to AC to read the Ignition Pulse Generator. The shop manual doesn't tell you that because it expects you to know that hall effect sensors generate their own voltage.

Last edited by unfetteredmight; 02-18-2011 at 7:27 PM.
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post #2 of 2 Old 05-27-2011, 10:11 PM
 
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Re: Direct Voltage Adapter

this is most likely the best elec. bit of info posted. I am supprised no one has replied. just so happens that I've elec. or fuel bug and just tested the ign. pulse gen. my meter said it was bad,ordered a new part. I'll retest

Last edited by 1ccwit; 05-28-2011 at 2:44 PM.
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