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tim
Mad Scientist
198 Posts |
 Posted - Jan 27 2007 : 4:14:46 PM
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| all i can find is ksp44 , but the 013 means something because there is also another transistor ksp44-012 as well so the bottom numbers mean something. |
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tim
Mad Scientist
198 Posts |
Posted - Jan 27 2007 : 4:16:25 PM
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| it comes up with this site because im probably the only one out there thats looking for this transistor and thats the only thing that comes up in the search. |
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Binary 1011001101
Nobel Prize Winner
United Kingdom
569 Posts |
Posted - Jan 27 2007 : 5:32:57 PM
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Normally I leave out the number at the bottom, here is a example: 7805C regulator, brings up lots of datasheets, but it has a number at the bottom that says 9537 if I type that into google plus the 7805C I get nothing.
If I was you just leave out the bottom number. |
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tim
Mad Scientist
198 Posts |
Posted - Jan 28 2007 : 12:37:53 AM
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| ok i looked it up without the bottom numbers ill have to see about that one. thanks. |
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VOLTAGE
Apprentece
Ghana
5 Posts |
Posted - Jan 30 2007 : 08:30:25 AM
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| How are the terminals of the 2N3055NPN transistor connected(ie.the base,collector and emitter)? |
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VOLTAGE
Apprentece
Ghana
5 Posts |
Posted - Jan 30 2007 : 09:06:47 AM
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| Are there substitutes for the HEP154 sillicon diode? |
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VOLTAGE
Apprentece
Ghana
5 Posts |
Posted - Jan 30 2007 : 09:08:20 AM
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| How do you determine the polarity of the capacitors? |
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VOLTAGE
Apprentece
Ghana
5 Posts |
Posted - Jan 30 2007 : 09:10:42 AM
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| Can R3,R4 be relaced by a 180-ohm,1-watt resistor? |
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Aaron Cake
Administrator
Canada
6718 Posts |
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tim
Mad Scientist
198 Posts |
Posted - Feb 01 2007 : 4:47:33 PM
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| hey guys, ok i had asked if anyone had known how to locate a transistor number which was KSP44-013 well it turns out that the transistor is in fact ksp44, dont show the 013 but it must have meant something , again it turns out that there is 2 of these transistors both are 012 and 013 so the replacement is ksp 44 and ksp 45. so the differences is the voltages, 45 is lower and the 44 is higher just the opposit. and its a hi voltage npn epitaxial mosfet driver transistor. |
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Binary 1011001101
Nobel Prize Winner
United Kingdom
569 Posts |
Posted - Feb 01 2007 : 5:19:02 PM
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| Yeh thought so, the -013 wasn't part of the part number, im not sure why the -013 is there. |
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cmdinh
Apprentece
9 Posts |
Posted - Feb 02 2007 : 2:08:27 PM
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after reading through 27 pages of this topic looking for a quick answer to my question... i came upon this conclusion...
if i want to step up my voltage from 12 to 120... i will need 12V transformer or also called 6-0-6 right? And depending on the power I want, i will have to select a transformer with necessary current as well.
Am i correct?? |
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CurrentOverflow
Mad Scientist
Canada
311 Posts |
Posted - Feb 02 2007 : 5:04:32 PM
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| I believe that when its a step down transformer it will turn 120Vac into 6Vac-0-6Vac, which isnt what you want. You want 12V which is a transformer that steps down to 12-0-12. Now if you consider this, putting 12V backwards onto a 12-0-12 will give you the 120VAC you want, not 6-0-6 (look at your other post :) ) |
~Mike~
Theres 10 kinds of people, those who understand binary and those who don't |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Feb 02 2007 : 6:49:36 PM
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The transformer's center-tapped winding has the +12V battery at its center-tap, and when one end is grounded by one of the output transistors then the other end is pushed up to +24V due to transformer action.
So the 24VAC center-tapped transformer produces a 120VAC square-wave. But it needs a proper circuit to drive it with enpugh current. A 300W inverter needs to have the output transistor on each side conduct 25A.
Three paralleled 2N3055 transistors can be used on each side but their base current will be about 10A so they will need another 2N3055 transistor used as a driver. It would need to have a medium power transistor to drive it. All these old transistors can be replaced by a pair of modern Mosfets. |
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tim
Mad Scientist
198 Posts |
Posted - Feb 02 2007 : 6:58:13 PM
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| but would mosfets be good to use rather then transistors, meaning will mosfets supply enough voltage to the transformer? |
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12/120V inverter again
