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Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
I just made a 24Volt DC supply for a motor on a spark gap coil I'm making.
Get an AC transformer with a 117v primary and a 17volt secondary. (17volts AC hits 24volts at the peak value) Then get a full bridge rectifier. Then get a fat electrolytic smoothing cap. (a couple thousand uf or even more, depending on how much ripple you want)
Registered Member #1924
Joined: Sun Jan 11 2009, 09:30PM
Location:
Posts: 12
the two lead-acid cells would be easiest. Actually, you might have an easier time going to radioshack and buying two 12v lantern batteries. That will just give you an easier time with storage and such.
If you are looking for something smaller, you could always make an RC circuit where you charge a capacitor bank for a long amount of time with some resistance, short the batteries and get a higher amperage pulse for a shorter period of time.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
SteveC wrote ...
I just made a 24Volt DC supply for a motor on a spark gap coil I'm making.
Get an AC transformer with a 117v primary and a 17volt secondary. (17volts AC hits 24volts at the peak value) Then get a full bridge rectifier. Then get a fat electrolytic smoothing cap. (a couple thousand uf or even more, depending on how much ripple you want)
Thats what I did and it works well.
The actual loaded value would be less than 24V because of the ripple caused by the load and also the diode voltage drop.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
The actual loaded value would be less than 24V because of the ripple caused by the load and also the diode voltage drop.
Youre right Myke. I accidentally wrote 17 instead of 18. The transformer I got has an 18volts secondary becuase a volt or so would be taken from the bridge. I checked the output, (while it was loaded) and it fluttered around 24vdc.
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how to get 24vdc@5a?
