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Old 10th September 2005, 12:04 PM   #1
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Default Transistor specs. Help!...do you know those units?

I have bougth to dismount, an enormous Zenith PC monitor...very good unit, in good conditions of operation, but having 500 watts power consumption...so.... was dismounted.

Very good unit...enormous heat sinks that can be used for audio, may transistors, big resistors, wonderfull capacitors and many SMD.

I could have some 30 Megahertz, 30 watts transistors...very nice units.

Well...good junk... having one big 12 volts fan blower also.

I will show you some units that i could not have identification, of course i can blow one to discover maximum colector to emitter voltage...blow another one to discover maximum power dissipation and maximum current.... i can assemble a small circuit and inject a variable frequency oscilator, to discover maximum frequency and the point of - 3dB roll off...but really...really a boering activity, as some of you may know those units of have some suggestion were i can search for them.

thank you in advance

regards,

Carlos
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Old 10th September 2005, 12:05 PM   #2
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Default This one is a Fet...and was used with high voltage.

Image.

regards,

Carlos
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Old 10th September 2005, 12:06 PM   #3
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Default This one a rectifier.

Do you know the specification of some of those units?

regards,

Carlos
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Old 10th September 2005, 12:07 PM   #4
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Default This one a chip, and may be the main oscilator to Pulse Width Modulation Power Supply

image


regards,


Carlos
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Old 10th September 2005, 12:09 PM   #5
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Default I have many of this one....Help!!!

Thank you all, in advance, by the kindness, of loose your time to help me.

regards,

Carlos
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Old 10th September 2005, 01:10 PM   #6
johnnyx is offline johnnyx  United Kingdom
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The L149 is probably this;-link
The MUR880 is a fast recovery diode, 8A, 800v.

Sometimes the prefix "2SA" or "2SD" or "BC" or "2N" etc is missing from the printed part number, take a guess and search google for it, If you get nothing, then try another prefix. If you have a PNP, and the search results in a PNP, in the right TO220 package, then you probably have found it.

Good luck
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Old 10th September 2005, 01:21 PM   #7
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It is very difficult to find specifications for obsolete transistors. Normally, one would use cross-reference guides to replace them during repair, rather than use them in new designs. With this in mind, I have provided the best cross-referenced spec sheets I could find when the manufacturer's spec sheet could not be found. But the cross-referenced part may perform quite differently from the original, don't expect to build a quality amplifier using them!!!

Zenith 1037-01, Silicon NPN Audio/Video Amplifier: http://www.nteinc.com/specs/100to199/NTE171.htm

Motorola 2SD1189???: Silicon Complementary NPN transistor; Audio Power Amp, Switch: http://www.nteinc.com/specs/100to199/NTE184.html

Motorola MUR880: Ultra fast diode; 8A, 800V: http://rocky.digikey.com/WebLib/On-S...20MUR8100E.pdf

SGS/Thompson L189, 4A Linear Driver: http://www.st.com/stonline/products/...re/ds/1316.htm

Zenith 1072-01: Silicon Complementary NPN Transistor; Medium power amp, switch: http://www.nteinc.com/specs/200to299/NTE291.html

BTW, glad your house is feeling better.

Wes
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Old 10th September 2005, 01:35 PM   #8
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Default Johnnyx and wes-ninja250...thank you both, very good informs, i will visit the links

You suggest Ninja..... pretty Motorcicle.

Also thanks the attention Ninja, the electrical problem in my appartment was fixed, with the help of many good forum guys...thank you.

Problem there was oxide and bad connections, one electronic lamp with the phase inverted, and wires loosen.... had to fix some screws and replace some wiring.

regards,

Carlos
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Old 10th September 2005, 02:28 PM   #9
karma is offline karma  Canada
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at one time i to was taking old monitors apart for parts thank god i dont have that job anymore

monitors are geting cheaper people are starting to just throw em out rather than get them repaired. i had to go to the dump last week and saw a pile of monitors there half of em where new.

im thinking to myself i could fix half of em

i meen really most of the time its the Vertical IC or the flyback.


cheers
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Old 11th September 2005, 11:25 AM   #10
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Default I have to do it Karma, it is a need.

Alike you, i prefer to junk them too.

But i need some help related components, and those junk equipments are very rich of good resistors and parts.

Those parts have one advantage...they are hardly tested.

regards,

Carlos
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