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oslinux23
New Member
Greece
1 Posts |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
 Posted - Feb 27 2010 : 04:40:25 AM
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| What happens if I use a mosfet for Q1 because I have failed to get a triac in a TO-247AC package and I wanted to use IRF64N instead. Thanks |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Feb 28 2010 : 10:08:40 AM
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| Other changes will be necessary to use a MOSFET. They have totally different characteristics then TRIACs. Can you not find a suitable substitute for this TRIAC? The exact characteristics aren't critical, as long as the gate current and voltages are the same. |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 01 2010 : 11:18:16 AM
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My problem is that these small BT139 cant stand the heat and they necessitate to use a very big and bulky heat sink which is not good. I used RFP150N as D1 by connecting together its gate and source terminals and it stands that heat because they are both on the same heat sink. So I would like to use the same mosfet for Q1 because it has the ability to stand the heat. Please help me redraw the circuit to show the extra parts that would enable to use a mosfet in place of Q1. Thanks
Dennis |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Mar 04 2010 : 10:18:51 AM
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Aaron cake please help me with this. Thanks
Dennis |
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yakitech
New Member
Nigeria
1 Posts |
Posted - Mar 17 2010 : 05:15:18 AM
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| hi aaron,pls could you help me a 12v charger circuit for my dcmotor powered generator.the charger will pick its ac from the gen ac output when gen is on and at the same time charging the battery without affecting the ac output of the gen.my battery is a 40a/h lead acid batt.you can reply via my e-mail [yakitech@yahoo.com]URGENT PLS.thanks |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Mar 17 2010 : 06:35:50 AM
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| You cannot use a battery to power a generator, and then use the generator's output to charge it. |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Mar 20 2010 : 10:14:44 AM
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| Why are you getting so much heat from the circuit? What are you charging? |
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pillow
New Member
2 Posts |
Posted - Mar 24 2010 : 12:14:18 AM
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| amended |
Edited by - pillow on Apr 09 2012 08:31:30 AM |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Mar 24 2010 : 01:24:30 AM
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| Read Aaron's reply on 10 August for the answer. |
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Electromaniac
New Member
Portugal
1 Posts |
Posted - Jul 31 2010 : 5:20:36 PM
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Hey,
My charger also has an output voltage (without load) of 8Volts.
Do you know whats wrong? When charging, the is no problem, but as you said before, without load it should be 12.
PS: I think the battery is now "broken", i tested previously and it had 11.9 volts, vou it has 8.5. All components are the ones on the page, no equivalent ones were used.
BTW thanks for all these circuits! Theyre very usefull. |
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RRITESH KAKKAR
Apprentece
India
23 Posts |
Posted - Aug 20 2010 : 04:30:39 AM
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| I want to know how to check mosfet as it is depletion or enhanched type plz tell....? |
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RRITESH KAKKAR
Apprentece
India
23 Posts |
Posted - Aug 20 2010 : 04:31:55 AM
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| as i am having IRF 3205....! |
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peterpl
New Member
Poland
2 Posts |
Posted - Dec 05 2010 : 4:45:53 PM
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| Could you tell me what happens if T1 secondary voltage will be 18 V AC ? What will be the battery charging voltage ? Should I change the resistors ? |
Peter |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 05 2010 : 5:05:07 PM
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| If T1 is a transformer rated at 12V, then the output voltage will be higher when it is not under load. 18V is probably reasonable. |
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Topic |
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Automatic 12V Lead Battery Charger
