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Messages - RC cola

#1
The Newcomer's Forum / Re: Poofed PS parts
October 05, 2011, 08:28:50 PM
I got the chance to plunder on this board this evening. I found a shorted zener diode that connects to the blown 2n5551 transistor. Its a 1N4752A.
#2
The Newcomer's Forum / Re: Poofed PS parts
September 26, 2011, 10:52:31 PM
I think this board is a product of Shenzhen Uniwisdom Technologies out of China. UWTech I think is the product name of audio gear.
#3
The Newcomer's Forum / Re: Choosing caps
September 26, 2011, 07:56:56 PM
This is the cap I was speaking of.
#4
The Newcomer's Forum / Re: Poofed PS parts
September 26, 2011, 07:52:11 PM
Here are pics of the board. The bridge rectifiers are mounted on the trace side of the board.

In the second pic you see on the right side where the poofed parts were.
#5
The Newcomer's Forum / Re: Poofed PS parts
September 25, 2011, 12:33:54 PM
I fully understand griping about Nady! Its been a while since I first cracked it open and I have the board on my shop desk and the cover is on the amp right now. This single board looks like it supplies both channels. Each channel are on separate boards. I can post a pic of the board if you want to see it.
#6
The Newcomer's Forum / Re: Choosing caps
September 23, 2011, 08:28:58 PM
I missed that graphic when I was looking to see if I had some how put the wrong part number in when I placed the order. The tech at Mouser pointed it out to me when I called. He even seemed puzzled when I first described the cap to him.
#7
The Newcomer's Forum / Re: Poofed PS parts
September 23, 2011, 08:25:53 PM
This amp is very heavy, I dont want to ship it to California. I figure I cant kill it any more than the death its had so far.

I followed the board trace and these parts are in the 100volt rail.

One of the two 2N5551 transistors exploded and the TO-220 case next to it had a lead blown out and the case damaged where no info was visible.
#8
The Newcomer's Forum / Re: Choosing caps
September 23, 2011, 07:42:21 PM
Look at the data sheet, second page under the selection chart. The left side graphic is what I got. Its a solid material with no heat shrink overwrap like aluminum can types are done.

I will try to get a pic of one posted soon.
#9
The Newcomer's Forum / Re: Poofed PS parts
September 23, 2011, 07:32:39 PM
I called and e mailed the company and was told they do not release schematics to customers. Its Nady, I dont have the model number handy at the moment.
#10
The Newcomer's Forum / Poofed PS parts
September 22, 2011, 10:28:24 PM
I have a power amp with some blown parts on a power supply board, a TO-220 and a TO-92 package. I looked at the number on the opposite parts and the TO-220 package has an f with a 209 then A940. I did a search and found a Fairchild part KSA940 noted as a vertical deflection output transistor. It lists the complementary part as a KSC2027, this is the part I think is the burnt one I have.

The TO-92 package is a 2N5551 thats connected to what Im thinking to be the KSC2027.

Am on the right track here? The output of this power supply board is 100 volt.
#11
The Newcomer's Forum / Re: Choosing caps
September 22, 2011, 10:18:30 PM
594-2222-138-36229

Thats the part number.
#12
The Newcomer's Forum / Re: Choosing caps
September 20, 2011, 07:57:36 PM
I got them from Mouser. I called last night and the teck said it was a polarized cap, black band is the negative end. Its a longlife according to him.
#13
Amplifier Discussion / Re: Safety Tips
September 17, 2011, 07:16:38 PM
Overhead cranes with a ride on operator has this foot switch better known as the "dead man" switch.
#14
The Newcomer's Forum / Re: Choosing caps
September 17, 2011, 07:07:50 PM
I ordered some caps and what I got does not matchthe data sheet description. I have never seen a cap looking like what was sent.

I ordered some axial 22uf 25 volt Vishay with a description typical for an electrolytic, metal can with plastic overwrap, series 138 AML type. This description is on the data sheet and not just going by a pic for the part listing from the supplier.

What I got looks like the case is a hard plastic, no overwrap with the value 22uf 25 V printed directly on the case, a black band on one end, the other end has a slight bevel around the outer edge and I see what looks like 138 KO printed on it. Its an odd tannish gray color. Its an axial type.

I searched the Vishay site for a Series 138 K but nothing like that shows up.

Anyone familiar with this part?
#15
The Newcomer's Forum / Re: Choosing caps
September 03, 2011, 12:44:15 PM
I was too vague with my question. Those basics I know about it was other specs listed I'm not sure of. For instance I see low ESR, high ripple, low ripple, suitable for high frequency applications, high speed switching power supplies, general purpose and so on. Is there some intended use for a cap that could make it not suitable to be used for basic filter and cathode bypass situations?