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bend wh0nx
Joined: 02 Sep 2008
Posts: 20
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 08 Oct 2008 9:52 240v (ac) to 12v (dc) converter |
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meet again guys,,,,,
here comes the most electronics beginners
nah,,,having a problem again,,,,
i'm using a dc power supply (9 volt battery) 4 da time being...
instead of using a 9 volts battery,,,,
i'd like to convert it to ac power supply (240v),,,,
any ideas?
big thanx if u guys could provide me with the schematic
daaa,,,,thanx
ben
Added after 9 minutes:
nah guys,,,,is it possible using this schematic,,,instead of having two output,,,i just choose the 15v output,,,,
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bend wh0nx
Joined: 02 Sep 2008
Posts: 20
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| 09 Oct 2008 1:06 Re: 240v (ac) to 12v (dc) converter |
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| curious,,,,about the diode....can i used the normal diode for the circuit or do i need a specific type of diode meeting some criteria for the it?.
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bend wh0nx
Joined: 02 Sep 2008
Posts: 20
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| 09 Oct 2008 14:24 Re: 240v (ac) to 12v (dc) converter |
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| another question,,,,what is the value of the capacitor being used after the transformer??
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Audioguru
Joined: 19 Jan 2008
Posts: 508
Helped: 39
Location: Canada
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| 10 Oct 2008 3:48 240v (ac) to 12v (dc) converter |
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The diodes need to be able to pass the average DC current. A 1N4001 diode has an average current rating of 1A like the 7805 regulator.
The 2200uF output capacitor is much too big. The datasheet for the uA7805 regulator recommends only 0.1uF.
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bend wh0nx
Joined: 02 Sep 2008
Posts: 20
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| 10 Oct 2008 14:41 Re: 240v (ac) to 12v (dc) converter |
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| owh thanx,,,1 more question,,,,what is the part name used below the 100K resistor?
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Audioguru
Joined: 19 Jan 2008
Posts: 508
Helped: 39
Location: Canada
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| 10 Oct 2008 15:16 Re: 240v (ac) to 12v (dc) converter |
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| bend wh0nx wrote: |
| what is the part name used below the 100K resistor? |
It is an old neon light bulb. It lights dimly when the voltage is 65V or more and the 100k resistor limits its current.
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bend wh0nx
Joined: 02 Sep 2008
Posts: 20
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| 13 Oct 2008 6:17 Re: 240v (ac) to 12v (dc) converter |
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| ow,,,ic,,,thanx,,,really appreciate it
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