Very basic: 22V to 12V AC - Page 2 - diyAudio
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Old 2nd December 2006, 11:11 PM   #11
paulb is offline paulb  Canada
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Here's the circuit for a 7812.
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File Type: jpg 7812 circuit.jpg (4.9 KB, 108 views)
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Old 2nd December 2006, 11:12 PM   #12
paulb is offline paulb  Canada
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And the diagram for the 7812.
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File Type: jpg 7812 pinout.jpg (6.3 KB, 98 views)
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Old 2nd December 2006, 11:16 PM   #13
paulb is offline paulb  Canada
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I took another look at the board you bought. It has a regulator on board already, and it looks like it is heat sinked. You may be able to apply your transformer voltage 22VAC directly to this board. Can you email them and ask?
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Old 2nd December 2006, 11:19 PM   #14
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Quote:
Originally posted by moamps


EDIT: Yes, LM350T is also fine.

Milan thanks for your help.

Hvala na pomoći, čovjek traži pomoć u svijetu a nađe je u susjedstvu.

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Old 2nd December 2006, 11:24 PM   #15
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Quote:
Originally posted by paulb
I took another look at the board you bought. It has a regulator on board already, and it looks like it is heat sinked. You may be able to apply your transformer voltage 22VAC directly to this board. Can you email them and ask?
I'll ask the guys at diyclub. But their english is very hm... funny i hope they will understand.
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Old 2nd December 2006, 11:27 PM   #16
moamps is offline moamps  Croatia
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Sve je ovo globalno selo.
Or in English: Today's world is a global village.

Diyaudio is always a great resource if you're stumped with a problem or just need some advice.

Regards,
Milan
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Old 3rd December 2006, 09:00 AM   #17
vuki is offline vuki  Croatia
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The "S" versions of 78xx regulators have larger current capacity. So... 78S12.
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Old 3rd December 2006, 10:30 AM   #18
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Ok the guys at diyclub answered, I can use my 22V trafo, just have to check the heatsink of the regulator so it doesn’t overheat.

Thanks everybody for their ideas and suggestions, now I know there is no easy way to drop AC voltage without a trafo
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Old 3rd December 2006, 10:42 AM   #19
moamps is offline moamps  Croatia
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Can you please tell me what's written on the blue capacitor re capacity and rated voltage? What's the spec written on the regulator?

Regards,
Milan
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Old 3rd December 2006, 11:52 AM   #20
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Quote:
Originally posted by moamps
Can you please tell me what's written on the blue capacitor re capacity and rated voltage? What's the spec written on the regulator?

As the kit hasn’t arrived yet, all the info I have are those pics. I asked what is the regulator onboard, but they answered only, it's ok to use 22V check the heatsink. I will upgrade the cap to 50V kind, and check the regulator can handle the 22*1,41=31V voltage. Do I need to check anything else ?
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