LED to newer 99/4A power supply

[Shift838]

Can an LED be added to one of the newer 99/4A power supplies? Like the one that came in the beige model?

 

I have a few of this type and was wondering.

 

 

[+Ksarul]

I've never looked to see if they were set up for them. . .this is a good question.

[+helocast]

Well, I don't know how many versions exist but I dug you out three:

Part # 1049689-2 (from 99/4A with original led structure), R2 provides current drop to ground/cathode, positive/anode connects to one side of SPDT slide switch.

Part # 1049689-3 (from QI 1981v with no led structure), R2 still there, holes to accept an led still there, positive/anode still connects to one side of SPDT slide switch.

Part # 1053201 (from slightly later QI 1981v with no led structure), R2 now gone, holes to accept an led still there, positive/anode now connects to R6 mid board. So I guess with this "switching" supply, it is generated elsewhere ... unless you want me to track down how/where.

 

Touched a 3mm led (unused from my project board) across pins A(anode) and K(cathode) and it lit when I turned the power on.

 

So the short answer, yes! Hope the pics are clear enough to allow you to compute color bands on resistors.

[+helocast]

If I could ask a question in return (without stealing your thread), I'd personally like to get rid of all my beverage warmers with these http://www.jameco.com/z/PT-45A-Mean-Well-AC-to-DC-Power-Supply-Open-Frame-Triple-Output-5-Volt-12-Volt-5-Volt-5-Amp-2-5-Amp-0-5-Amp-40-5-Watt_2106095.html ? It is the only linear or switching supply I can find that still sports a split-rail to actually serve up a regulated -5V.

 

I bought several http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?search_type=jamecoall&catalogId=10001&freeText=212338&langId=-1&productId=212338&storeId=10001&ddkey=http:StoreCatalogDrillDownView that WON'T work because I didn't read the pin outs closely. It uses a common ground between the 12V and 5V - so I guess I have extra supplies to take up room in my electronics drawer :/

Edited January 19, 2017 by helocast

[Shift838]

If I could ask a question in return (without stealing your thread), I'd personally like to get rid of all my beverage warmers with these http://www.jameco.com/z/PT-45A-Mean-Well-AC-to-DC-Power-Supply-Open-Frame-Triple-Output-5-Volt-12-Volt-5-Volt-5-Amp-2-5-Amp-0-5-Amp-40-5-Watt_2106095.html ? It is the only linear or switching supply I can find that still sports a split-rail to actually serve up a regulated -5V.

 

I bought several http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?search_type=jamecoall&catalogId=10001&freeText=212338&langId=-1&productId=212338&storeId=10001&ddkey=http:StoreCatalogDrillDownView that WON'T work because I didn't read the pin outs closely. It uses a common ground between the 12V and 5V - so I guess I have extra supplies to take up room in my electronics drawer :/

 

the pictures are plenty clear. Thank you. Also good find on the triple output power supply. I was looking for one like this as I was thinking of wanting to get rid of the beverage warmer too.

[Shift838]

i think I may buy a couple of the triple output power supplies that 'helocast' referenced and see if I can get one wired up with a standard 3 prong PC type plug and it mounted inside a case with the 4A and all along with an LED on it.

 

Good thing is it won't be a 35+ year old power supply...

Edited January 19, 2017 by Shift838

[Shift838]

Well, I don't know how many versions exist but I dug you out three:

Part # 1049689-2 (from 99/4A with original led structure), R2 provides current drop to ground/cathode, positive/anode connects to one side of SPDT slide switch.

Part # 1049689-3 (from QI 1981v with no led structure), R2 still there, holes to accept an led still there, positive/anode still connects to one side of SPDT slide switch.

Part # 1053201 (from slightly later QI 1981v with no led structure), R2 now gone, holes to accept an led still there, positive/anode now connects to R6 mid board. So I guess with this "switching" supply, it is generated elsewhere ... unless you want me to track down how/where.

 

Touched a 3mm led (unused from my project board) across pins A(anode) and K(cathode) and it lit when I turned the power on.

 

So the short answer, yes! Hope the pics are clear enough to allow you to compute color bands on resistors.

 

The new power supply I have is Part # 1053214-2 and has R6 completely removed. the holes are there and seems the solder washed over them but no resistor.

[+helocast]

 

The new power supply I have is Part # 1053214-2 and has R6 completely removed. the holes are there and seems the solder washed over them but no resistor.

 

Well that sounds like yet a fourth, newer revision I don't have in which TI shaved costs on in the final days. It's really becoming too much to track at this point!

[+Ksarul]

There are about a dozen variants that actually have the LED too, assuming you wanted to make a somewhat comprehensive version count of TI coffee warmers. . .