6 to 12v
- Martin Benade
- 356 Fan
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6 to 12v
Does anybody know if the voltage reducer that Zims sells for wiper/sunroof motors can be used for wipers and 6v feed for the temp and fuel gauge? It seems like it would be workable. I talked to somebody at Zims today but he didn't know much about it.
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
Re: 6 to 12v
hey martin - i don't remember where (i'll check) but i thought a 356 vendor sold an entire conversion kit with the resistors for the gauges - i'll see where it was - brad
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Re: 6 to 12v
I tried to reduce the voltage for my fuel gauge using a wiper motor resistor and it did not work. I ended up building a simple voltage reducer circuit for mine. Might make more sense to get it reworked by a gauge rebuilder.
Re: 6 to 12v
it makes more sense to get 12V gauges!Kevin Wills wrote:. . .Might make more sense to get it reworked by a gauge rebuilder.
i found these at Zim's - i don't know why the guy there didn't know - ask for Al next time
Drop down resistor for clocks, relays:
http://www.allzim.com/acatalog/Drop_Dow ... elays.html
Drop down resistor for instruments:
http://www.allzim.com/acatalog/Voltage_ ... 2e000_2eXX
hope this helps - brad
- C J Murray
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Re: 6 to 12v
If you look on-line there are a variety of these sold for various uses. They are cheap.
'57 Speedster
'59 Sunroof
'60 Devin D Porsche Race Car
'63 Cabriolet "Norm"
'67 911 S Original Owner
'03 Ferrari 575M
'09 Smart Passion
'59 Sunroof
'60 Devin D Porsche Race Car
'63 Cabriolet "Norm"
'67 911 S Original Owner
'03 Ferrari 575M
'09 Smart Passion
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Re: 6 to 12v
If you want to build something, here is what I based my circuit on: http://www.voltagecurrent.info/lm7806-datasheet/
The advantage of using a step down circuit was that it was so much cheaper than new gauges or getting mine reworked. It was less than $20 worth of parts to build and was an hour long project. A resistor will work too, but must be sized correctly; the wiper motor resistor is just too big for gauges. This is because the draw of the circuit alters the output voltage when using a resistor - more resistance is required with more current needed. A step down circuit with a transistor like the LM7806 will have a steady output voltage within the limits of the chip (for this one, about 1.5 amps).
The advantage of using a step down circuit was that it was so much cheaper than new gauges or getting mine reworked. It was less than $20 worth of parts to build and was an hour long project. A resistor will work too, but must be sized correctly; the wiper motor resistor is just too big for gauges. This is because the draw of the circuit alters the output voltage when using a resistor - more resistance is required with more current needed. A step down circuit with a transistor like the LM7806 will have a steady output voltage within the limits of the chip (for this one, about 1.5 amps).
- Martin Benade
- 356 Fan
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Re: 6 to 12v
Looks good. The LM7806 (and possibly a heat sink) is all that is needed to feed the gauges? I take it that the block diagram shown in the link just shows the inner workings of it?
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
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Re: 6 to 12v
Martin, it will need a couple of other components, but it is a simple circuit to build. I will try to dig up the diagram I used and post it this weekend.
- Martin Benade
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Re: 6 to 12v
I found a description of the wiring on the H.A.M.B. saying only that two capacitors (optional) were needed. Does that sound correct? Online elsewhere I found no diagram, but did pick up a virus!
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
- Martin Benade
- 356 Fan
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Re: 6 to 12v
One more question- will an electric tach work on 12 V using the 6 v power feed? And any circuit diagram for the LM 7806?
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
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Re: 6 to 12v
Martin, I checked mine last night because I could not find a diagram that looked like what I built. Turns out mine was based on a slightly different chip. Here is a link to the schematic:
http://www.electronics-lab.com/articles/LM317/
http://www.electronics-lab.com/articles/LM317/
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Re: 6 to 12v
Oh, and I'm not sure on the tach. Mine is mechanical...
- Jim Liberty
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Re: 6 to 12v
Guys, I convert all my cars to 12V. The Tach., and speedo. only need bulb changes if they are mechanical. N. Hollywood will convert the combo. gauge. Brad Ripley sells a very nice step down for the wipers.
.....................................Jim.
.....................................Jim.
Jim Liberty
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Re: 6 to 12v
Cool!
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Re: 6 to 12v
How do I find Brad Ripleys site?