Small fuses? Mastech HY3005

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

meant 5/8 inch

There is a 5 x 20mm variety. Radio Shack sells them if you can't find them anywhere else.

Best Regards, Keith Marshall snipped-for-privacy@progressivelogic.com

"I'm not grown up enough to be so old!"

Let's say that I go to some store or try to look up those fuses on the web, what should I ask for? "Do you have 5/8" fuses"?

The power supply seems to work if I insert a nail in the fuse opening, but, obviously, it is not a good practice to use it that way.

Sounds about right, I will try to check out RS. Thanks.

There are also 5x25 & 5x30mm fuses. Not as common as 5x20mm, but check to make sure before you go shopping. If you have trouble finding them locally and/or aren't in a hurry, email me the amperage and if I have them I'll stick a few in an envelope. I used to use a lot of 5x25mm in control panels in modular fuse holders, but these days I can buy circuit breakers for only a few dollars more than the fuse holders.

Ned Simmons

Thank you Ned. I already went and bought 5x20mm fuses at a nearby RadioShack. I will try them tonight.

On Tue, 14 Mar 2006 16:59:45 GMT, with neither quill nor qualm, Ignoramus4546 quickly quoth:

Call Mouser and ask them or look them up online, Ig.

- - - - - - - - - - - - - - - - - - Heart Attacks: God's revenge for eating his little animal friends --

Thanks Larry. Some people suggested to try 5x20mm fuses, I bought some at the nearby RadioShack, and will give that a shot today. This power supply could be good to do some plating.

Chinese ex-military? (Mastech is Chinese!)

Yep, I can post pictures of this power supply with military stickers. I am surprised myself. I got it in a big pallet pile of power supplies (not the one with the huge 100A power supplies, but a different one).

old number was probably an 8AG unless they were the foreign type.

John

Thanks to all. I really needed 5x20 fuses. The ones I got yesterday were wrong size, but the power supply shows healthy signs of life.

If it is prone to blowing, you can always outboard a 3AG inline fuse holder in its place. Hard to beat the price of

If it keeps blowing, I will get the voltage and current meter out of the supply and toss it to garbage. I bought 2a fuses and I learned that I need 6a fuses (the 2a one lasted for a few minutes of messing around). I already bought the 6a fuses and will try them tomorrow, as today someone is going to visit me.

Does anyone own a similar power supply? I could not properly switch it to constant current mode.

There is no switch.

Set the voltage to the maximum that is acceptable for your application. Turn the current knob all the way CCW. Then turn off the supply and connect the load. When you turn the supply back on, advance the current knob until current reaches the desired level.

Thanks Don. Worked great, with a resistor. I set current with the resistor in the circuit, then shorted outputs, and the current did not change but voltage dropped to almost zero.

So, I think, this supply is quite suitable for tasks such as plating small objects.

I appreciate your advice, it helped.

Da nada.

Yes, that supply should work nicely for plating and anodizing small objects. Matter of fact, Caswell Plating sells Mastech supplies for that use. The integral meters are a nice feature. I don't know how well the Mastech supplies regulate current, but plating and anodizing aren't that fussy.

Constant current is definitely the way to go because current is the relevant parameter in these processes. Figure your surface area, dial in the appropriate current, look at your watch and go do something else while things progress.