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Old 03-04-2017, 07:07 PM   #1 (permalink)
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Default Need 12 vdc from ac lines

So I thought I figured this out. I wired up a rectifier and cap like this.



Firing it up I get roughly two to three volts out DC. The rectifier is a small one but it should work shouldn't it? The volts go up and down a little bit but it's not reaching the 12 volts.

The signal is a temp sensor and it's grounded at the block.
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Old 03-04-2017, 08:29 PM   #2 (permalink)
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What size cap are you using? Depending on the size you may have lots of ripple and your meter is reading the average DC voltage, try and read AC volts and see what you get. Also any info on the temp sensor is it a resistor type device that changes resistance with temperature?

The top line would be your AC signal, the middle would be the output of the rectifier (assuming your using a full wave, if not then the blue lines will be flat lined at 0V making your average much less)and the bottom line will be the signal after the cap and being applied to the temp sensor. depending on the value of the cap and the load the ripple minimum voltage will vary affecting your average DC voltage.
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Old 03-04-2017, 08:40 PM   #3 (permalink)
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Here is another example and a link that explains how to create a true DC voltage based on the cap value and load.

Full Wave Rectifier and Bridge Rectifier Theory
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Old 03-04-2017, 09:03 PM   #4 (permalink)
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Another issue you may run into is if the AC voltage increases and decreases much with engine RPM. Only using diodes and and a cap there is no regulation.
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Old 03-04-2017, 10:00 PM   #5 (permalink)
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1000uf 25v

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Old 03-04-2017, 10:32 PM   #6 (permalink)
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https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

This is the rectifier
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Old 03-04-2017, 10:55 PM   #7 (permalink)
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full wave bridge rectifier is what i used to convert. Tapped into my yellow that i use for my heated shield grounded to bolt on VR and i've been running a GPS unit off of a marine grade 12v cig adapter for the whole season and works perfectly.

https://www.amazon.ca/gp/product/B01...?ie=UTF8&psc=1

https://www.amazon.ca/gp/product/B01...?ie=UTF8&psc=1
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Old 03-04-2017, 11:16 PM   #8 (permalink)
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I would think 1000uF and that rectifier should be fine, I don't think the sled puts out any where near 50VAC. Any info on the load (temp sensor) maybe measure voltage without it connected and see if there is any difference.

If you have anymore of the 1000uf caps you could add a second in parallel and see if that helps.

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Old 03-04-2017, 11:25 PM   #9 (permalink)
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If I interpret your diagram properly, you've taken the 2 AC inputs of the bridge rectifier and connected them together, effectively shorting out half the bridge. Thus you have a half wave rectifier with two diodes in series. The normal system is 12 VAC rms, which is 17V peak. A half wave rectifier delivers 0.318 of peak, or 5.4 volts. Subtract the voltage drop of the two diodes and you have 5.4 - .75 - .75 = 3.8 volts.

You need to connect the bridge AC inputs, one to yellow and the other to chassis ground. The DC negative output needs to be isolated from chassis ground. This full wave setup will deliver about 9.4 volts DC.
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Old 03-05-2017, 10:25 AM   #10 (permalink)
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Really need to run a voltage regulator thats made for dc also to run a battery w/electric start. I use the ac/dc regulator wired with a small 12v battery to a plug when i had my gps in the sled.
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