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Tool Talk Discussion Forum

24 volts to 12 volts?

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Joey gesumaria

12-22-2004 17:13:37




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I work at a lock smith and we are having a problem with an electric lock... i need to reduce the voltage going through the circuit from 24 volts down to 12 volts... it is a very small space so i need to use resistors.. small ones... which ohm resistor would be best? please tell color combinations on the resistor so i can find it in my kit easy. thank you so much




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MarkB_MI

12-23-2004 18:14:05




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
Joey,

You left out some important pieces of information: Is this an AC or DC device, and is your 24V power source AC or DC? The answer you get depends a lot on these two details.

Of course, any other information you have about the resistance or current draw of the device is helpful as well.



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ScottP

12-23-2004 09:04:02




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
Joey
They make a rectifier for just for this.
Take a look at page 2750 in the McMaster-Carr catalog. Their at the bottom of the page in the middle.
I just installed one of these rectifiers myself a couple of weeks ago.
Scott



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jeffcat

12-23-2004 08:33:17




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
Sounds like you are trying to hook up a room door lock and key pad or some other security device. Good guess or am I all wet? It is raining here in NJ.



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T_Bone

12-23-2004 08:56:39




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 Re: 24 volts to 12 volts? in reply to jeffcat, 12-23-2004 08:33:17  
Hi Jeff,

Or trying to build a jump around box and By-pass some security codes?

I never seen a locksmith that didn't have the answers!

T_Bone



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Ramrod

12-23-2004 07:05:27




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
The simple answer is two equal resistors in series, with 24v at one end and ground at the other end. There will be 12v in the middle, between the two equal resistors. Now you need to size the resistors so that don't get hot and burn up under load. A much better way would be a 12v regulator/chip. These can input 24v and output 12v in a small 3 legged package (needs heatsink), and handle 1 amp load, hopefully much more that you'll need.

Ramrod

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buickanddeere

12-23-2004 10:08:58




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 Re: 24 volts to 12 volts? in reply to Ramrod, 12-23-2004 07:05:27  
I was thinking of one of those handy little rascals too. Problem is most are 3.0 amp with the occassional 5.0amp unit. Those door solenoids draw about 30 amps if memory serves correctly.



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buickanddeere

12-23-2004 04:23:30




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
We have to know what current the solenoid draws on 12V before we can give you any resistance values.



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jeffcat

12-22-2004 18:03:08




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
One quick and dirty is to take a 24 volt light bulb in series. It will glow and act as the resistor you need. Jeffcat



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kidbob

12-22-2004 17:31:19




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 17:13:37  
First you must find the ohmes of the locking coil by finding it on the lable or measure with good meter. The resistor needs to be the same ohmes and at least enough wattage to handle the amps of the coil. watts is amps times volts.



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Joey gesumaria

12-22-2004 18:13:36




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 Re: 24 volts to 12 volts? in reply to kidbob, 12-22-2004 17:31:19  
hmmmm thank you very much... but just for giggles...what if it were just a plain closed circuit how could we get the volts down by 12 by the end of the circuit?



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cannonball

12-23-2004 07:16:09




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 Re: 24 volts to 12 volts? in reply to Joey gesumaria, 12-22-2004 18:13:36  
try this site Link have nice day may god bless



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surefire

12-23-2004 11:23:17




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 Re: 24 volts to 12 volts? in reply to cannonball, 12-23-2004 07:16:09  
I think the easiest way to do this would be to change the 110/24v trans to a 110/12v trans.Placing Radio shack type resistors in the circuit even with the correct math may be a fire hazard.Just match the va ratings the same[va indicates power] So 24v 40va to 12v 40va will each have the power to operate the solenoid.[What are you breaking into haha]



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