DC to DC Multi-Purpose Voltage Converter $14.98

[shorza]

Great, cheers. How do you determine the voltage out? or is it always 4v?

[NeilP]

To run these at higher input volatages...72 (84v) or more could you wire a pair in series on the input side? or would thatnot work if the output from one was not eh same as the output from the other?

[thewmatusmoloki]

Fechter can explain these better than me, check out this thread from 2007....

viewtopic.php?f=16&t=2264

How do you determine the voltage out? or is it always 4v

Regardless of the input voltage the output is always at the rated dc volts in my experience.

[NeilP]

I did read through the post you mentioned, and all i can see about putting supplies in series, is using the outputs in series...not the inputs.

If I had two of these supplies as mentioned in this current thread, with Max input voltage of 60volt, and setup two of them in series on the INPUT side ...so 84 volts across two of them in series, so 42 volts across each one under no load conditions...will that work if the outputs of both have different loads on them?

[hillzofvalp]

Is this just a glorified LM317T?

[Lyen]

Hi hillzofvalp,

Thanks for your interest in the DC to DC multi-purpose voltage converter. It actually uses a number of electronic components other than the LM317T. For further technical inquiry, please email me at LYEN@HOTMAIL.COM.

Best Regards,
Lyen

Is this just a glorified LM317T?

[icecube57]

Is it possible to wire 3 of these parallel to a power supply at 48v and series the output of the converters to make a high voltage variable power supply.

Is the current limited internally or would they have to be regulated externally.

Im essentially looking for a way to turn my 48v power supply to a 75v charger.

[Lyen]

Hello Icecube,

Thanks for your interest in the converters. You may consider a step up voltage converter to up convert from 48v to 75v.

Regards,
Lyen

Is it possible to wire 3 of these parallel to a power supply at 48v and series the output of the converters to make a high voltage variable power supply.

Is the current limited internally or would they have to be regulated externally.

Im essentially looking for a way to turn my 48v power supply to a 75v charger.

[webfootguy]

No you can't because these are not isolated. But, if you did get an isolated DC/DC converter at the right voltage, you could series the output with the 48v input to boost the 48v to 75v easily. You would need a 75-48v = 27v converter. Make sure you find one that says the output is isolated from the input and you are good to go (as long as you deal with limiting the current)

Is it possible to wire 3 of these parallel to a power supply at 48v and series the output of the converters to make a high voltage variable power supply.

Is the current limited internally or would they have to be regulated externally.

Im essentially looking for a way to turn my 48v power supply to a 75v charger.

[NeilP]

How could these be used with a 84 v supply?
I do not want to tap into the supply for a lower voltage and un balance the pack...could the inputs of two be wired in series? and then use the outputs independantly? one for back lights one for front lights?

[wojtek]

another question- are there any converters available that would take around 20W-30W out?

[Lyen]

Hi Woktek,

Thanks for your interest in the DC converters. I think the converter is ready 20-30W capable according to the specification. For example, power is voltage multiply by current. So for instance, 10v at 3A is already 30 watts.

Regards,
Lyen

another question- are there any converters available that would take around 20W-30W out?

[mikebikerad]

Recieved mine. Works awesome and powers up my magic shine nicely. Running it on 48 volt battery.

[NeilP]

Well after a couple of PM's with Lyen, and talking about my 84 volt pack...my requirements could not be met with these convertors...so I went down the local dump and came back with about a dozen small mains power supplies form things like LCD monitors, video cameras, portable speakers, printers etc etc.

all ranging from 100 to 240 volt input and various outputs, from 5 volt to 18 volt. Well sticking 84 volt DC in to them, and they pretty much all worked.. Often taking a few moments longer to power up than if feeding them with 240v AC. SO now I have a variety of small SMPSu's all usable with 84 volt in.
So my problem solved, all with PSU's from the dump

[ambroseliao]

I'm wondering how clean (ripple) the DC voltages are from those small units? Do you have a oscilloscope by any chance?

Ambrose

[NeilP]

Possibly. At least I can probably get access to one

I only plan to power small halogen or led light units off them, so should be ok for that. I recently picked up a box of 20 or more 12 v 20 and 35W mini spotlights.... Not sure what they are called, but they are the same type as my 6v 10w Catseye bike headlamp...so as long as I do not melt the housing , should be ok

Will see if I can get a scope across the outputs

Neil

[hillzofvalp]

send me a light

[NeilP]

They are not complete units, just the bulb . Only have one of the housings

[ecodean]

Hi Lyen. Could 4 of these be wired in parallel to make a 12a supply?

[NeilP]

Sorry Ambrose, still not chance of getting to a scope.

I have tried running my 7.2 volt lights off a 12 v unit and they work fine. I did not just stick 1 v straight up them...I mailed the manufacturer, andt ehy mailed me back saying the front end voltage control circuitry was OK to up to 12 v..Di Notte lighting..make great lights

[thenate1]

Anyway to get more AMPs flowing through these? I want to use one to power some heated grips and the manufactures emailed me back saying:

"12 volts DC will be fine to run the grips. They will draw about 3.5 amps or 44 watts per pair as they come up to the set temperature. After they have reached the set temperature (when the blue lights on each grip stop pulsating) the amp draw can vary between 0 and 3.5 amps, depending on conditions."

[oldpiper]

Anyway to get more AMPs flowing through these? I want to use one to power some heated grips and the manufactures emailed me back saying:

"12 volts DC will be fine to run the grips. They will draw about 3.5 amps or 44 watts per pair as they come up to the set temperature. After they have reached the set temperature (when the blue lights on each grip stop pulsating) the amp draw can vary between 0 and 3.5 amps, depending on conditions."

If you just want a standard 12V, why not get one of the many 48V-12V converters available on eBay or such? Lyen's converters are about the only ones I've seen which you could tweak for nonstandard voltages, but there are several to choose from for conversion to 24V, 12V, 5V, 3.3V, etc.

Cameron

[NeilP]

Or just do what I did and find an old Mains PSU that runs 12volt. If it has an input showing 100-240V AC, chances are it will work...not if it is a big old fashoned heavy transformer type, it needs to be a switched mode type.

I found a load, in the range 3-6 amps...the sort used to power LCD PC monitors are good

[Lyen]

Hi Ecodean,

Thanks for your interest in the DC to DC multi-purpose voltage converter. Yes, you may connect four converters in parallel as a 12A power supply.

Regards,
Lyen

Hi Lyen. Could 4 of these be wired in parallel to make a 12a supply?

[ChinaPhil]

I use an iPhone 4 for navigation and have been trying to power / charge it with one of these converters set at 5V and powering a USB charging cable - cannot get it to work, any suggestions?

Phil