What can I do with this tranny?

ThSpeakerDude88 · 27th July 2005, 09:24 PM

hey I've got a transformer laying around, was wondering what voltages I can get out of it after rectification. Its 24vac @ .8 amps center tapped, and 11 vac @ 1 amp ct. So, +/- 12 volts and +/- 5.5v I'm assuming. I know rectification of an ac voltage rasies voltage, but how much voltage can I get total +/- out of the 24v ct section, and at what amperage?

cowanrg · 27th July 2005, 09:30 PM

its probably not enough current to do a whole lot with. maybe a preamp or xover circuit? most likely not enough juice for an amp though.

ThSpeakerDude88 · 27th July 2005, 09:51 PM

ok. It was used to power a TDA2050 and some rohm 10 watt chip in a 2.1 system. Big waste of space if you ask me.

cowanrg · 27th July 2005, 10:43 PM

after rectification you will get a factor of about 1.4 time the original voltage. so, you would get 33.6V out but still at 0.8A.

paulb · 27th July 2005, 10:55 PM

You can run a small amp with it. Surprising how little power you need in most situations. Average listening levels are probably something under 1 watt.

ThSpeakerDude88 · 27th July 2005, 10:58 PM

well my pocket amp runs on a 32 volt 940 ma psu with no problems, accept of cource for diminished power output. So technically speaking I could build up to a 26 watt amplifier (33.6 x .8) with this power supply, like the TDA2040, or even the TDA2050 run at a lower voltage?

ThSpeakerDude88 · 27th July 2005, 11:00 PM

p.s. how do I rectify it? I have a bridge rectifier that came off the amp board it powered, as well as some 12 volt + and - regulators.

cowanrg · 27th July 2005, 11:04 PM

here is a good example from decibel dungeon.

ThSpeakerDude88 · 27th July 2005, 11:09 PM

ok. Thanks! Looks pretty simpl, But , the fuse board is still attached to the transformer. It only had 2 wires in........I dont think it has a ground wire, does that matter, should I just follow the digram below for the rectification?

cowanrg · 27th July 2005, 11:12 PM

it only has two wires into the transformer, or two wires into the fuse board?

maybe a picture could help? but either way you should be fine and the diagram above should still be applicable.

27th July 2005, 09:24 PM	#1
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	What can I do with this tranny? hey I've got a transformer laying around, was wondering what voltages I can get out of it after rectification. Its 24vac @ .8 amps center tapped, and 11 vac @ 1 amp ct. So, +/- 12 volts and +/- 5.5v I'm assuming. I know rectification of an ac voltage rasies voltage, but how much voltage can I get total +/- out of the 24v ct section, and at what amperage?

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27th July 2005, 09:30 PM	#2
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	its probably not enough current to do a whole lot with. maybe a preamp or xover circuit? most likely not enough juice for an amp though.

27th July 2005, 09:51 PM	#3
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	ok. It was used to power a TDA2050 and some rohm 10 watt chip in a 2.1 system. Big waste of space if you ask me.

27th July 2005, 10:43 PM	#4
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	after rectification you will get a factor of about 1.4 time the original voltage. so, you would get 33.6V out but still at 0.8A.

27th July 2005, 10:55 PM	#5
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	You can run a small amp with it. Surprising how little power you need in most situations. Average listening levels are probably something under 1 watt.

27th July 2005, 10:58 PM	#6
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	well my pocket amp runs on a 32 volt 940 ma psu with no problems, accept of cource for diminished power output. So technically speaking I could build up to a 26 watt amplifier (33.6 x .8) with this power supply, like the TDA2040, or even the TDA2050 run at a lower voltage?

27th July 2005, 11:00 PM	#7
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	p.s. how do I rectify it? I have a bridge rectifier that came off the amp board it powered, as well as some 12 volt + and - regulators.

27th July 2005, 11:04 PM	#8
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	here is a good example from decibel dungeon.

27th July 2005, 11:09 PM	#9
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	ok. Thanks! Looks pretty simpl, But , the fuse board is still attached to the transformer. It only had 2 wires in........I dont think it has a ground wire, does that matter, should I just follow the digram below for the rectification?

27th July 2005, 11:12 PM	#10
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	it only has two wires into the transformer, or two wires into the fuse board? maybe a picture could help? but either way you should be fine and the diagram above should still be applicable.