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Old 3rd March 2013, 10:06 PM   #2181
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Quote:
Originally Posted by troystg View Post
Agreed, transformers can't but secondaries can.

If he parallels the secondaries of the transformers he doubles the current in a safe manner.
You can only parallel secondaries of the same transformer, of course if the transformer allows that... The leaflet that comes with it should give you what you need to do it
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Old 3rd March 2013, 11:07 PM   #2182
troystg is offline troystg  United States
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Quote:
Originally Posted by dimkasta View Post
You can only parallel secondaries of the same transformer, of course if the transformer allows that... The leaflet that comes with it should give you what you need to do it
+1

A better, more thorough explanation...
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Old 3rd March 2013, 11:20 PM   #2183
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Well, okay, okay: technically if you make sure the windings are the in phase and the output voltages and impedances and current ratings equal, secondaries sharing a core and secondaries on separate cores can be treated equivalently. You can connect them in parallel to increase the total output current. Probably. Haven't tried it but I see no reason in principle that it wouldn't work.

However, that diagram in proximity to the words "i'll admit from the start i know nothing about electronics" is reason enough for alarm.

If you need more current, buy a bigger transformer.
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Old 4th March 2013, 04:17 AM   #2184
vulejov is offline vulejov  Serbia
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Quote:
Originally Posted by rjm View Post
If you need more current, buy a bigger transformer.
How big transformer for phonoclone?
I think 1.9 VA is enough..
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Old 4th March 2013, 05:01 AM   #2185
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1.9 VA is only 80 mA @ 24VAC. It will work, but peak current draw in the phonoclone rectifiers can easily exceed that. A 25-50 VA transformer provides a good practical compromise in cost, size and sound quality.

(I think we've been here before. Many times...)
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Old 4th March 2013, 08:02 AM   #2186
vulejov is offline vulejov  Serbia
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4 LT 1028.. 4x7=28 mA
4 LM 7812/7912.. 4 x1= 4 mA

Wht is enough?!
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Old 4th March 2013, 07:52 PM   #2187
Bibio is offline Bibio  Scotland
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thanks guys thought it was a silly idea.. lol

i'm looking forward to the phonoclone kit coming from Richard and should be good fun putting it together and if i can manage to do it then there is hope for everyone as i'm completely clueless but want to learn.

btw. i have not heard vinyl for over 15 years and i have been subjected to MP3's in the meantime so my ears will be fresh as a daisy. busy putting my LPT back into service and i'm like a kid with a new toy :-)
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Old 4th March 2013, 08:54 PM   #2188
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Quote:
Originally Posted by vulejov View Post
4 LT 1028.. 4x7=28 mA
4 LM 7812/7912.. 4 x1= 4 mA

Wht is enough?!
See here.
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Old 4th March 2013, 09:49 PM   #2189
vulejov is offline vulejov  Serbia
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Quote:
Originally Posted by rjm View Post
Thanx.. but this is irrelevant.. LM78/7912 works or doesn't works, after stabilisators voltage is always 12V..

1.9VA transformator works very smooth, believe me or not..
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Old 4th March 2013, 09:49 PM   #2190
Bibio is offline Bibio  Scotland
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another question.

i take it the rectifiers are dependant on what current the transformer can put out?

so the 200v 3amp rectifier would be for a transformer capable of outputting 3 amps.

if i got larger transformers lets say of putting out 6amp would i keep the 200v the same but up the current handling of the rectifier to 6amp?
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