Fans for the PL700's, and the DC protect circuit board

[Gepetto]

Hi Sutton
You should have made an offer at $5 He may have taken that bid.

Just keep it a few feet away Sutton and power it from a different feed than the rest of your gear and you should be fine.

 

[ksrigg]

What is the best sheilding material? Copper? Aluminum? Maybe I can find a box and put thee power supply inside to sheild everything from its noise? Any ideas?

 

[laatsch55]

Sutton, most of the noise will be from feedback into the AC line, not physically from the unit, don't need to shield it. Just do as Joe suggests and you'll be fine.

 

[ksrigg]

I finally found the clips at Lowe's. Only took me three trips. For anyone else looking they are Ideal Brand item number 772412 Ground Clip Molio Clip Trombone fondant 14-10 Gauge/Calibrador/Calabre and are 25 per pack. $4.33 per pack. The ones I found are green and were hanging from a peg in the area near the electrical supplies, but on the oposite side of the isle...Go figure...
I hooked a battery to one of the fans and they are pretty cool little buggers. Absolutely dead quite...no sound at all, but there may be when I put the three per amp and give it power from the power supply. They do not move nearly as much air as the 120V AC versions you built Lee, but I think they will move enough air to keep the transistors cool. Can't wait for the power supply to arrive. I think I'm going to get a second one for the other side of the rack, and run three sets of fans from each supply. Since these are smaller than the ones Lee made, I gotta determine whether to have the base of the fans at the bottom of the heatsinks, or at the top...D the drivers typically get hotter than the outputs, or is it the other way around? Probably not much difference either way.

 

[laatsch55]

Top on down.

 

[Gibsonian]

http://www.tigerdirect.com/applications ... CatId=2216

Think I'm gonna try two of these on a 700. 83 cfm a piece, and noise will be a very quiet 32 dB with them both running. Little pricey but worth it imo.

 

[laatsch55]

Pricey???? I think that's pretty reasonable Scott.

 

[laatsch55]

Ok, so I've been playin g with fans tonight. Found some 24 volt dc SQUIRREL CAGE types. 1-1/2 inch high 6 inches wide. Super quiet.

 

[laatsch55]

I think I bought 36 or 48 of them a couple years ago and took them to our shed in the Rozet yard and promptly forgot about em.

 

[laatsch55]

A little WDS-40 on the shafts and bushings helped a lot.