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Old 10-10-2011, 06:21 AM #17
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Default Re: Projector Power Supplies

If they're out of the projectors, they run the whole projector, not just the diode array.

The question is, does this board directly power the array, or does it just feed another driver board.. If it's the former, then one of the pins will be a modulation input since the diodes run pulsed in the projectors.

Easiest way to figure out what's what, is to just measure/scope everything with a projector running... That or figure out how to get service documentation.


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Old 10-10-2011, 10:41 AM #18
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Exclamation Re: Projector Power Supplies

Quote:
Originally Posted by DTR View Post
^^^I can. For the 3 quantity add $10 or I could do 15 for $95 shipped to Greece First class in a medium flat rate box.
Hi DTR,

Can you do 15 for $95 shipped to Germany First class in a medium flat rate box?
If yes, could you send a Paypal-invoice to me ?

------

And for allothers: Yes it is from the c***o, giving only 5 & 12 Volts.
The Driver for the LD-Array and the Phatlight-LED sitting on another PCB with big SMD-Coils.

Greetings: Marco (lange5766)

Last edited by lange5766; 10-10-2011 at 10:53 AM. Reason: edit information
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Old 10-10-2011, 02:08 PM #19
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Default Re: Projector Power Supplies

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Hi DTR,

Can you do 15 for $95 shipped to Germany First class in a medium flat rate box?
If yes, could you send a Paypal-invoice to me ?
Yep sent you an Invoice.
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Old 10-10-2011, 02:49 PM #20
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Default Re: Projector Power Supplies

How much current can these supply ?
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Old 10-10-2011, 03:02 PM #21
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Default Re: Projector Power Supplies

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Yep sent you an Invoice.
Thanks DTR,

It is paid per Paypal (Transactioncode:9KG52194HR210445L)

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Old 10-11-2011, 12:14 PM #22
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Default Re: Projector Power Supplies

Okay, I did the tests and the above pin-outs are correct. The power-on pin is also convenient for controlling the power supply. The power supply will always provide 5V at the 5V output so long as it is plugged in, so that you can control the power supply's operation. Hold the power-on to if you want the power supply off. When you want to turn the power supply on, connect the Power-on pin to ground (active-low), and ~12V will appear at the 12 power pins.

I would only use the 5V for lower power controller devices, and the 12V for powering diodes and other higher powered devices. The 5V has a very clean signal, and is almost exactly at 5V. The 12V power is also relatively clean, but there is some noise on the power that makes it around 12.2V to 12.6V at times. Use that for powering things, especially for bucking circuits.

I powered some lame UV LED with a resistor in line to see if it worked on the 12V power, and it did. I didn't have any other higher current circuits I could try (didn't want to break out rectifiers and didn't have enough voltage for the 18V LED). I don't know how much current it can source for 12V, but with a bucking circuit you could probably power some pretty hefty loads.

All in all, a nice power supply, being very compact, controllable, and providing very usable voltages and power, all for a cheap price.

Oh yeah DTR: if you have them, you might want to include the 6-pin and 16-pin power connectors to the PSU's so that people can connect them without soldering to the connector itself.

Edit: I wasn't able to test the power-on pin on the 16-pin adapter as I didn't have that soldered up. I think it provides 5V as well, but is controlled, like the 12V by the global power-on on the 6-pin adapter.

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Old 10-11-2011, 02:32 PM #23
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Default Re: Projector Power Supplies

Quote:
Originally Posted by Bionic-Badger View Post
Okay, I did the tests and the above pin-outs are correct. The power-on pin is also convenient for controlling the power supply. The power supply will always provide 5V at the 5V output so long as it is plugged in, so that you can control the power supply's operation. Hold the power-on to if you want the power supply off. When you want to turn the power supply on, connect the Power-on pin to ground (active-low), and ~12V will appear at the 12 power pins.

I would only use the 5V for lower power controller devices, and the 12V for powering diodes and other higher powered devices. The 5V has a very clean signal, and is almost exactly at 5V. The 12V power is also relatively clean, but there is some noise on the power that makes it around 12.2V to 12.6V at times. Use that for powering things, especially for bucking circuits.

I powered some lame UV LED with a resistor in line to see if it worked on the 12V power, and it did. I didn't have any other higher current circuits I could try (didn't want to break out rectifiers and didn't have enough voltage for the 18V LED). I don't know how much current it can source for 12V, but with a bucking circuit you could probably power some pretty hefty loads.

All in all, a nice power supply, being very compact, controllable, and providing very usable voltages and power, all for a cheap price.

Oh yeah DTR: if you have them, you might want to include the 6-pin and 16-pin power connectors to the PSU's so that people can connect them without soldering to the connector itself.

Edit: I wasn't able to test the power-on pin on the 16-pin adapter as I didn't have that soldered up. I think it provides 5V as well, but is controlled, like the 12V by the global power-on on the 6-pin adapter.

Can you find how much mA the 5V and the 12V pins are supplying ?
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Old 10-11-2011, 03:11 PM #24
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Default Re: Projector Power Supplies

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Okay, I did the tests
Thanks for the info. Added it to the OP.
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Old 10-11-2011, 03:50 PM #25
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Default Re: Projector Power Supplies

Little update.

I am getting 10.5A on the 5V.

First I tried powering a flexdrive set to 1450mA. No issues.


Then I did an Amp test and it was reading 10.5A.


Also tried my Red LED from the projector and it works perfectly from the 5V line.(Which I am actually getting like 4.2V-4.4V when I test the voltage)

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Old 10-11-2011, 05:47 PM #26
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Default Re: Projector Power Supplies

You might be getting lots of current from the 5v, but I seriously doubt these PSU's were designed to put out anywhere near this current off the 5v side. The 5v output in electronics is generally a 'standby' output. It powers the microprocessors and other low power circuits all the time, so enough logic will still function for it to be able to turn the rest of itself on and off when you push the power button.
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Old 10-11-2011, 05:49 PM #27
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Default Re: Projector Power Supplies

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Originally Posted by qumefox View Post
You might be getting lots of current from the 5v, but I seriously doubt these PSU's were designed to put out anywhere near this current off the 5v side. The 5v output in electronics is generally a 'standby' output. It powers the microprocessors and other low power circuits all the time, so enough logic will still function for it to be able to turn the rest of itself on and off when you push the power button.
I was thinking the 5V was intended to drive the LED. As it does it @ 10A with no issues at all. I have run it for 2 minutes but my heatsink was flaming hot so I ended the run there. Did not see any stability issues.

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Old 10-11-2011, 07:17 PM #28
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Default Re: Projector Power Supplies

If it's 'always on' It's not intended to drive the LED.. Since well.. the LED would always be on then.

Always on 5v circuits are standby power sources. It's what runs the logic circuits when the projector is turned off.

Easiest way to figure out what's driven by what, is to just follow the wires in the projector. My guess is you'll find the 12v lines going to other driver boards, which in turn run the LED and diode array.
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Old 10-12-2011, 12:55 AM #29
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Default Re: Projector Power Supplies

I just realized that I think we may be talking about different outputs.
I now see the 5V output. It is here. So I am thinking this is the 5V output that may be the low current output you guys are thinking of.



This output will give either 12V or 4.2V. It switches.



Depending on how you jump the power on pin on this connector.



So that would make one 12V or 4.2V output and a 5V for running the electronics.
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Old 10-12-2011, 02:03 AM #30
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Default Re: Projector Power Supplies

the 12/4.2 switch is odd. Be interesting to see where exactly those pins go inside the projector.
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Old 10-12-2011, 08:52 AM #31
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Default Re: Projector Power Supplies

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Can you find how much mA the 5V and the 12V pins are supplying ?
No, I really can't. Voltage power supplies are theoretically supposed to be able to provide infinite current if necessary. The amperage rating of a power supply only specifies how much it can supply safely without burning itself out. So even if I hooked up my multimeter and blew out its 20A fuse testing the current it wouldn't reveal much about what the power supply is really capable of, or rather what it can safely supply.

Looking at the traces, the power supply can provide quite a few amps. I estimate that if the circuitry is able to power all 24 445nm diodes, the 8A LED, the fans, and the peltier using a bucking circuit from the 12V source you're looking at at least 10A of current that can be used on the 12V rail. I wouldn't push the 5V rail much except for control circuitry.

It's so funny seeing these PSUs for sale on eBay for like $50. I wonder if anyone even buys them?
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Old 10-12-2011, 09:14 AM #32
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Default Re: Projector Power Supplies

Quote:
Originally Posted by DTR View Post
I just realized that I think we may be talking about different outputs.
I now see the 5V output. It is here. So I am thinking this is the 5V output that may be the low current output you guys are thinking of.
I think the power-on for the 16-pin adapter may be to tell the PSU to keep the power on at a lower level to keep the fans on for cooling down the projector before it finally turns off. I wouldn't rely on it for a specific voltage though.

In the absence of any signal on the power-on pin on the 16-pin adapter, when the PSU is off (plugged in, but 6-pin power-on pin held to 5V), the 12V lines should be zero volts.

The 6-pin diagram you've shown there may be confusing. The center two pins of the 6-pin adapter are ground, and connect directly to the ground of the 16-pin adapter (as do the 12V pins to the 12V pins on the 16-pin adapter). Maybe with power-on pin on the 16-pin adapter changes the ground state to signal that power should be produced? I'm not sure (haven't tested it myself).

I'd just rely on the power-on pin on the 6-pin adapter to control the power state of the PSU. Hold the 6-pin's power-on pin to 5V (which is always on) if you want to keep the PSU off. Hold it to ground if you want it on. I'd only use the power-on pin to turn on the entire PSU and then modulate signals with other circuitry as it takes too long to discharge the capacitors if you wanted to do control using the power-on pin.
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