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Old 02-13-2013, 03:32 AM   #1
Brewn4life
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Default 24V to 5V step down

Ok so I got my 24V AC/DC transformer for my gas valves and would like to use it for my SSR's (pumps) as well for the manual turn on. I'm going to run the 5Vdc from BCS for the auto turn on.(using a three way switch). Problem I am having is the only step down I can find I have to get from Hong Kong. I know some one hear has a good place to shop for this. What are you guys using Im thinking about 100W so if need be I can add to system.
Thanks,
Ryan

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Old 02-13-2013, 03:57 AM   #2
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You are looking for 120VAC in, 24VDC out?

Or 24VDC in, 5VDC out?

I'm not following

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Old 02-14-2013, 02:01 AM   #3
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24Vdc to 5Vdc, but Im thinking the SSR's have a 3-32Vdc trigger any ways.
https://www.oscsys.com/store/product/272
So what the hell I could just get a 3 way switch that can handle 24Vdc which would be my manual on(pump) and BCS could handle the auto on/off. One transformer powering the pumps and gas valves. All different relays of course.

Oh and I have the transformer to go from 120Vac to 24Vdc

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Old 02-14-2013, 02:17 AM   #4
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Actually upon further evaluation my transformer is actually a 110Vac to 24Vac...back to square one.....finding a control voltage source for the manual on of the SSR's

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Old 02-14-2013, 03:47 AM   #5
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Put the 24VAC through bridge rectifier then connect the output through a big capacitor (like 1000 uF / 50V) to ground. The output will be about 30VDC which should be OK for the SSR input.

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Old 02-14-2013, 10:41 AM   #6
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Why not just use a wall wart or some form of power supply?

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Old 02-14-2013, 11:00 AM   #7
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Doorbell power supply is all you need

very cheap

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Old 02-14-2013, 12:16 PM   #8
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Quote:
Originally Posted by alien View Post
Put the 24VAC through bridge rectifier then connect the output through a big capacitor (like 1000 uF / 50V) to ground. The output will be about 30VDC which should be OK for the SSR input.
Actually, an unloaded 24VAC transformer will probably get you 28VAC, and rectified / filtered will end up 38-39 VDC. Depends on the current rating of the transformer.
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Old 02-14-2013, 12:18 PM   #9
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Quote:
Originally Posted by Maxkling View Post
Why not just use a wall wart or some form of power supply?
That's what I would do, too.
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Old 02-14-2013, 12:25 PM   #10
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Cool was looking at the Power supply's and that will work. All the Doorbell power supply's were AC out put so I m not sure which ones your talking about. Send a link please. I did not get a chance to look at the Bridge Rectifier yet will do after work. Thanks for your help.

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