24v ac power pack help - Page 1
Forum section: electronics / beginners

author: pillsburry
author_rank: Newbie
timestamp: May 27, 2016, 12:24:25 pm
content: hi all i'm in need of a 24v ac power pack for a old jvc ptz cctv camera i got a 34v ac one but was wondering is there a easy way i can convert this to 24v ac insted of 34v ac any help would be great thank you all

author: danadak
author_rank: Super Contributor
timestamp: May 27, 2016, 12:29:29 pm
content: Variac -https://www.google.com/search?q=variac+image&biw=1821&bih=812&tbm=isch&imgil=GvJTcNR-UgbO-M%253A%253BKhWX8IggR7tzfM%253Bhttp%25253A%25252F%25252Fwww.popsci.com%25252Fdiy%25252Farticle%25252F2009-10%25252Fwhat-variac&source=iu&pf=m&fir=GvJTcNR-UgbO-M%253A%252CKhWX8IggR7tzfM%252C_&usg=__oDFjkCcgxyCOM0QcpreMUQXtK4A%3DOr, if not a molded unit check to see if there are other taps on the primary you can select.Regards., Dana.

author: pillsburry
author_rank: Newbie
timestamp: May 27, 2016, 12:31:22 pm
content: thank will take a look now

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 27, 2016, 12:42:40 pm
content: A variac is a handy tool on the workbench, but it isn't very suitable as a long-term solution. It is large, heavy, expensive, and vulnerable to mis-adjustment unless you tie-down the knob somehow.Line-lump (or wall-wart) power supplies are pretty inexpensive and quite possibly available for free if you are a savvy recycler.Perhaps beyond your current ability to evaluate, but it is possible that the gadget could tolerate the 34V without significant trauma.Remember, however, that in addition to matching the VOLTAGE, you must also have a power source capable of at least as much CURRENT as the load requires.

author: Shock
author_rank: Super Contributor
timestamp: May 27, 2016, 04:46:51 pm
content: Buy the correct power pack. As mentioned check the maximum current draw of either the original or look at what the camera uses and then allow plenty of headroom (say 20%). Consider if you need to power more than one camera before buying. Avoid buying a cheap Chinese knockoff off Ebay as they can be junk and dangerous.

author: jitter
author_rank: Frequent Contributor
timestamp: May 28, 2016, 05:17:14 am
content: Quote from: pillsburry on May 27, 2016, 12:24:25 pmI wonder if this camera might also work off a DC adapter. If it takes the AC and does nothing else than convert it into DC, it should. If it also needs the mains frequency for some reason, it probably won't.

author: pillsburry
author_rank: Newbie
timestamp: June 02, 2016, 07:45:49 am
content: pos but dont fancy frying it though as expensive camera and a 24vac power brick is loads of pennys lolconsidering i got the 34vac one just wont to hack it and drop volt to 24v

author: christopher iles
author_rank: Regular Contributor
timestamp: June 02, 2016, 11:14:47 am
content: The JVC cameras will work on 24v ac or 12v dc. If you have a "wall wart" 12v dc 1Amp, that will run it.It is not polarity conscious as there is a bridge rectifier inside the camera.I would not suggest putting 34v ac across it as the maximum voltage they will tolerate is about 28v ac.Hope this helps.

author: CJay
author_rank: Super Contributor
timestamp: June 02, 2016, 03:03:10 pm
content: Quote from: jitter on May 28, 2016, 05:17:14 amYes, well worth checking.Quite a lot of the CCTV cameras I've worked with would use 12VDC as well but JVC do seem to have a number of cameras that only specify 24V AC, would of course be worth the OP checking specs.

author: Shock
author_rank: Super Contributor
timestamp: June 03, 2016, 06:58:41 am
content: OP is not listening, he just needs to look a little harder. There is one on Maplin I found for only 10 pounds. Sometimes it's just best to spend a few dollars than burn down your house on imaginary ideas that you are saving money.