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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Need 12 volt ac to 24 volt ac transformer
Hi I need to convert 12 volts ac to 24 volts ac for an outdoor
lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks |
#2
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Need 12 volt ac to 24 volt ac transformer
wrote in news:gjou23dncnb7ne7u2qcfuaf6nk031r1at7@
4ax.com: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Where are you getting your 12V? You could use a voltage doubler to get around 24 volts dc from your 12 volts ac... ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#3
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Need 12 volt ac to 24 volt ac transformer
On Wed, 25 Apr 2007 11:18:32 -0500, me wrote:
wrote in news:gjou23dncnb7ne7u2qcfuaf6nk031r1at7@ 4ax.com: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Where are you getting your 12V? You could use a voltage doubler to get around 24 volts dc from your 12 volts ac... ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- Its for a 12 volt ac pathway lighting system (300 watt ac transformer). 2 or 3 of the lights I want to use are 24 volts. |
#4
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Need 12 volt ac to 24 volt ac transformer
wrote in message news On Wed, 25 Apr 2007 11:18:32 -0500, me wrote: wrote in news:gjou23dncnb7ne7u2qcfuaf6nk031r1at7@ 4ax.com: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Where are you getting your 12V? You could use a voltage doubler to get around 24 volts dc from your 12 volts ac... ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- Its for a 12 volt ac pathway lighting system (300 watt ac transformer). 2 or 3 of the lights I want to use are 24 volts. Most decent transformer manufacturers supply transformers with 2 primaries & 2 secondaries to make the transformer as versatile as possible. The primaries (which you don't need for what you want to do) can be in series for 230V and parallel for 115V, the secondaries can also be used in the same way so get 12V secondaries and wire them in series and use them as a 12V to 24V auto transformer. |
#5
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Need 12 volt ac to 24 volt ac transformer
wrote in message ... Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Assuming that you don't need isolation, just use a tranny with either two 12v secondaries, or one centre tapped 24v secondary, as an auto transformer. Connect the two windings in series ( if it's a centre tapped 24v winding, they already are anyway ), then connect your 12v AC across one of the windings. 24v will then appear across the pair of windings, so one leg will be common to both input and output. The primary would be unused, but it would be a good idea to just tie its ends together with a light load - say a 10k resistor. you could connect a line voltage neon indicator across it as well, just to show that it's powered. Arfa |
#6
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Need 12 volt ac to 24 volt ac transformer
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#8
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Need 12 volt ac to 24 volt ac transformer
On Wed, 25 Apr 2007 21:57:41 GMT, Tim wrote:
In article , says... On Wed, 25 Apr 2007 14:18:20 GMT, put finger to keyboard and composed: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Here's a voltage doubling rectifier: D1 o-----|--||-----|-----o +16V | _|_ + 12VAC | --- C1 rms | | o----- )---------+-----o 0V | _|_ + | --- C2 | D2 | |--||-----|-----o -16V The unloaded output voltage is around 33V, but under load you may get closer to your target. - Franc Zabkar OR you could get one of those 220 to 110 travel adaptors and wire the 110 side to 12 VAC and get 24 VAC out the other side. - Tim - That sounds the the perfect idea. Thanks |
#9
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Need 12 volt ac to 24 volt ac transformer
wrote in message ... On Wed, 25 Apr 2007 21:57:41 GMT, Tim wrote: In article , says... On Wed, 25 Apr 2007 14:18:20 GMT, put finger to keyboard and composed: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Here's a voltage doubling rectifier: D1 o-----|--||-----|-----o +16V | _|_ + 12VAC | --- C1 rms | | o----- )---------+-----o 0V | _|_ + | --- C2 | D2 | |--||-----|-----o -16V The unloaded output voltage is around 33V, but under load you may get closer to your target. - Franc Zabkar OR you could get one of those 220 to 110 travel adaptors and wire the 110 side to 12 VAC and get 24 VAC out the other side. - Tim - That sounds the the perfect idea. Thanks I rather think not, as the power rating of such an item is highly unlikely to be anywhere near the 300 watts or so that you require. At 24 volts, that equates to more than 12 amps ... Arfa |
#10
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Need 12 volt ac to 24 volt ac transformer
In article ,
says... wrote in message ... On Wed, 25 Apr 2007 21:57:41 GMT, Tim wrote: In article , says... On Wed, 25 Apr 2007 14:18:20 GMT, put finger to keyboard and composed: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Here's a voltage doubling rectifier: D1 o-----|--||-----|-----o +16V | _|_ + 12VAC | --- C1 rms | | o----- )---------+-----o 0V | _|_ + | --- C2 | D2 | |--||-----|-----o -16V The unloaded output voltage is around 33V, but under load you may get closer to your target. - Franc Zabkar OR you could get one of those 220 to 110 travel adaptors and wire the 110 side to 12 VAC and get 24 VAC out the other side. - Tim - That sounds the the perfect idea. Thanks I rather think not, as the power rating of such an item is highly unlikely to be anywhere near the 300 watts or so that you require. At 24 volts, that equates to more than 12 amps ... Arfa 300 Watts? He said 500ma right? 24V x .5A = 12W (roughly) - Tim - |
#11
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Need 12 volt ac to 24 volt ac transformer
Tim writes:
In article , says... On Wed, 25 Apr 2007 14:18:20 GMT, put finger to keyboard and composed: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Here's a voltage doubling rectifier: D1 o-----|--||-----|-----o +16V | _|_ + 12VAC | --- C1 rms | | o----- )---------+-----o 0V | _|_ + | --- C2 | D2 | |--||-----|-----o -16V The unloaded output voltage is around 33V, but under load you may get closer to your target. - Franc Zabkar OR you could get one of those 220 to 110 travel adaptors and wire the 110 side to 12 VAC and get 24 VAC out the other side. They may have too much winding resistance. And of course, must be true transformers, not those triac things that are for hair dryers. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#12
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Need 12 volt ac to 24 volt ac transformer
In article ,
says... Tim writes: In article , says... On Wed, 25 Apr 2007 14:18:20 GMT, put finger to keyboard and composed: Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Alternately I could use a cheap 12 volt ac to 24 volt dc converter. Google has turned up endless garbage for me. Thanks Here's a voltage doubling rectifier: D1 o-----|--||-----|-----o +16V | _|_ + 12VAC | --- C1 rms | | o----- )---------+-----o 0V | _|_ + | --- C2 | D2 | |--||-----|-----o -16V The unloaded output voltage is around 33V, but under load you may get closer to your target. - Franc Zabkar OR you could get one of those 220 to 110 travel adaptors and wire the 110 side to 12 VAC and get 24 VAC out the other side. They may have too much winding resistance. And of course, must be true transformers, not those triac things that are for hair dryers. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. A real converter is just a transformer. We always use 'em backwards to step up voltages for our toys. I know that some newer ones may use semi's to do the job, but I did not suggest that type be used. - Tim - |
#13
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Need 12 volt ac to 24 volt ac transformer
Tim wrote:
A real converter is just a transformer. We always use 'em backwards to step up voltages for our toys. I know that some newer ones may use semi's to do the job, but I did not suggest that type be used. You also didn't warn him that if he chose the wrong type it would go up in flames. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#14
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Need 12 volt ac to 24 volt ac transformer
On Apr 25, 7:18 am, wrote:
Hi I need to convert 12 volts ac to 24 volts ac for an outdoor lighting project low amperage, say 500 ma. I am looking for a small boosting transformer on the cheap. Any suggestions on where I can find something like this? Radio Shack. |
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