3 power supplies from the past

[goodpsusearch]

Re: 3 power supplies from the past

The TNRs in the photos are in the feedback circuit and those are not stressed or heated, so I left them.

[momaka]

Re: 3 power supplies from the past

Good save!
The 5VSB circuit looks interesting as I see Q1 has 4 pins instead of the regular 3. Perhaps a dual transistor of some sort? I wonder if it is a 2-transistor design or perhaps Q1 is actually an IC (like a TOPswitch or something similar).

The only thing I would do extra is take a flat screwdriver and open the gaps between the heatsink fins. This should help with the heat dissipation a bit. But overall, it looks like a well-built PSU, so it may not need this mod.

[goodpsusearch]

Re: 3 power supplies from the past

Good save!
The 5VSB circuit looks interesting as I see Q1 has 4 pins instead of the regular 3. Perhaps a dual transistor of some sort? I wonder if it is a 2-transistor design or perhaps Q1 is actually an IC (like a TOPswitch or something similar).

The only thing I would do extra is take a flat screwdriver and open the gaps between the heatsink fins. This should help with the heat dissipation a bit. But overall, it looks like a well-built PSU, so it may not need this mod.

This psu doesn't have the typical 2 transistor circuit, as it uses a Fairchild 1H0265R Power Switch(FPS). I don't know if that means 5vsb is safe from failing or overvolting, but it's interesting to see that very old psus went a level higher from CWT motherboard killer Antec psus.

The fan is in series with the thermistor, so it rotates fast enough to keep the psu cool.

[momaka]

Re: 3 power supplies from the past

^ Ah okay. Probably pretty safe from over-voltage then.

[goodpsusearch]

Re: 3 power supplies from the past

I modded and recapped the Enhance power supply.

Wester547 was right about the ADDA fan. It was completely dry and noisy! I oiled it using singer sewing machine oil.

The fan speed controller circuit is designed to keep the psu cool. This power supply is not by any means silent. Even when completely cold the fan moves a reasonable amount of air.

Another thing that I liked is that this unit's protections are fairly tight. With no load connected the 12V line settles at 10.7V, and the psu shuts down immediately. This does not happen with Linkworld psus or Macron. I have crossloaded them to the point that the voltages went clearly out of specs without shutting down.

I replaced the BYQ30E-200 ultra fast rectifier, rated for 16A with STPS20H100CT.

5vsb: 2x470uF 16V Jamicon WG --> 2x1000uF 6.3V Sanyo CG

-12V: 1x470uF 16V Jamicon WG --> not changed

-5V: 22uF 16v Teapo SEK --> 100uF 16V Teapo SEK

3.3V: 1x 2200uF 6.3V Teapo SC & 1x 1000uF 6.3V Jamicon WG --> 2x 2200uF 6.3V Teapo SC & SX

5V: 2x 2200uF 6.3V Teapo SC --> 1x 2200uF 6.3V Teapo SC & 1x2200uF 16V Nichicon PL

12V: 1x 3300uF 16V Jamicon WG --> not changed

I removed the glue from everyplace and used Arctic Silver Thermal Adhesive to permamently attach the thermistor to secondary heatsink.

It works and the voltages are stable with 12V computer.

[momaka]

Re: 3 power supplies from the past

Wow, that's a nice Deer there (giveaway: "RD-DW" on transformers). Good save!
Just make sure it doesn't have any secondary output loading resistors that have very low resistance. Deer typically likes to put 10 Ohms on the 3.3V rail, 47 Ohms on the 5V rail, and 100 Ohms on the 12V rail - all a terrible choice IMO.

[goodpsusearch]

Re: 3 power supplies from the past

Actually, I don't think it's possible that Deer made it. The supervisor IC is Enhance proprietary. So, the OEM should be Enhance.

[japlytic]

Re: 3 power supplies from the past

Unfortunately, this psu lacks an ATX 12V connector.

What do you think?

The ATX12V specification was not introduced in ATX power supplies until a few years later.

[momaka]

Re: 3 power supplies from the past

IIRC, Enhance did used to sell some units that were made by Deer/Allied, and I think I saw that somewhere in the pictorial thread (was a very very long time ago though, so my memory could have been degraded).
And yeah, you are right - it looks nothing like the typical Deer. Perhaps Deer built these specially for Enhance. Or perhaps Enhance bought transformers from Deer? I don't know, but those "RD-DW" markings I've seen only on Deer PSUs.