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 12/120V inverter again
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tim
Mad Scientist

198 Posts

Posted - Jan 27 2007 :  4:14:46 PM  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
How are the terminals of the 2N3055NPN transistor connected(ie.the base,collector and emitter)?
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VOLTAGE
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Ghana
5 Posts

Posted - Jan 30 2007 :  09:06:47 AM  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
Can R3,R4 be relaced by a 180-ohm,1-watt resistor?
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Aaron Cake
Administrator

Canada
6710 Posts

Posted - Jan 30 2007 :  09:13:17 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by VOLTAGE

Are there substitutes for the HEP154 sillicon diode?



The circuit as posted on the circuits page does not work very well. But if you want to make it anyway, see the following topics regarding the diode. I just searched for "HEP154". It took less then 10 seconds to find the answer:

http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=5480
http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=2452
http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=383
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tim
Mad Scientist

198 Posts

Posted - Feb 01 2007 :  4:47:33 PM  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Send cmdinh an AOL message  Reply with Quote
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  Show Profile  Click to see CurrentOverflow's MSN Messenger address  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
but would mosfets be good to use rather then transistors, meaning will mosfets supply enough voltage to the transformer?
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