Projector Power Supplies

[DTR]

Ok so I need to clear out some of these power supplies that have been stacking up. They are $20 for five supplies with free shipping in the US. Or $8 for one and $3 for each additional

Power supply has three outputs. A low current 5V line, A high current 10A+ 5V output(actually about 4.2V) and a 10A+ 12V output.

The power supply will always provide 5V on the low current 5V output so long as it is plugged in. This line is used to toggle on and off control of the 5V or 12V outputs. Jumping the pin labeled below "power on" with the pin labeled 5V will turn on the 5V ouput or jump it with the pin labeled 12V below and it will turn on the 12V output.







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 but that is the max rating on my DMM so it may be capable of much more.


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)

[andy_con]

do we have to guess the spec?

[DTR]

^^^Here is some information but I don't know if his tests were completely successful in fooling the power supply that the LD array is there. Anyone here had a chance to get one working?

Ok, I took a pic of the where my test leads are.

Then I tried a jumper between the first pin and the 3rd pin pins 3 & 4 are the same.
This resulted in a fluctuating voltage at 12 to 12.5

Then jumping pin 1 to either pin 5 or 6 results in a fluctuating voltage from 4 to 4.5


If any one with better testing tools can see if these yield a good voltage please test this out. I only have this DVM.

And some more good info.

I've been studying the power supply as well. Here's the pin-out as far as I've derived:





I believe the Power ON to the 6-pin connector is an input, and the one on the 16-pin supply is an output, as the former is the input to a photocoupler, and the latter appears to be connected to the collector of a transistor (?) Q102.

The +5V is always on as far as I can see, and is used to turn on the power supply through the photocoupler-connected lead. The power supply might be be providing 12V as well, or just staying on because the power on is floating. I'll have to test it later when I splice the cables.

Edit:

Power ON on the 6-pin connector is active-low. You're measuring 4.53V because of the diode in the photocoupler and the resistor in-line. The anode (+) is connected directly to the +5V input on the 6-pin connector.

[laserdj]

So.. it's a 12V only PSU right?
Any idea how many Amps?
To turn it on, we do short the "Power On" with "GND" ?

[DTR]

I am waiting to hear back from a few people that were testing these to see if they have some specifics. It was probably premature of me to list them without a lot of specifics on how they can work. I just have about 70 of these sitting here and hoped some members here would be familiar with them and had a chance to get them working.

[laserdj]

I got a few laying around too... would be nice if they are put to good use!

[DTR]

Alright looks like good news. It does not require anything special to get the power supply working. Here is a post from a user over @ LPF.

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.

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.

5v is low current and the 12v is high current... figure whatever the projector is rated for in watts that's probably going to be close to its output...

so IIRC its draw is 270W so at least 14A @ 12V?

[flecom]

ya I was going to mention the 5v is low current and the 12v is high current... figure whatever the projector is rated for in watts thats probably going to be close to its output...

so IIRC its draw is 270W so at least 14A @ 12V?

[DTR]

Well I am getting 10.5A on the 4.2V Setting.

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


My DMM only reads up to 10A and it exceeded that.




Also tried my Red LED from the projector and it works perfectly from the 4.2V line.(Which I am actually getting like 4.0V-4.3V when I test the voltage)

[laserdj]

DTR, 5V is only available on the 6 pin connector, is that correct? I´m a little confused by your pics...