Meanwell RT-65 question ( PSU ) - Page 1
Forum section: electronics / projects

author: JanJansen
author_rank: Frequent Contributor
timestamp: January 11, 2017, 03:17:19 pm
content: Hi, i like to have positive and negative voltages for my synthesizer project,i,m looking to this part : Meanwell RT-65, it costs 25 euro in the shop, if i buy it i dont have to solder 220volt parts myself.https://www.meanwell-web.com/nl/product-info/ac-dc-power-supply/enclosed-type/61-90-w/rt-65/product/RT-65BThe datasheet is not big, maybe you have some info for me about this PSU ?, anyone using that ?Why do i need to adjust the trimmer ?And how would you connect this to the power cord the safest way ?, it always goes wrong here, i dont want any risk,maybe you can advice another part, where you directly plug the power cord in ?, that would be nice.And how would i mount that thing ?, are there some screwholes so i can attatch it to wood ?, how does it work ?Thanks in advance, greetings

author: JanJansen
author_rank: Frequent Contributor
timestamp: January 11, 2017, 03:38:25 pm
content: And how does it works : cant i change L & N reversed ?, here in holland you can plug your cord in the wall reversed.And do i need to use the earth ?, cant i plug a powercord without earthing ?, or are there no other devices that dont need earthing ?

author: DBecker
author_rank: Frequent Contributor
timestamp: January 11, 2017, 07:33:32 pm
content: The typical way to use a supply like that is to crimp ring terminals onto a power cord, and put the whole assembly into a enclosure with a clamping grommet for the power supply cord to pass through.You can drop down in safety to spade terminals and knot in the power cord with a regular grommet.But do you really need the hassle? If you use a standard external power brick you avoid lots of safety considerations. How much power do you really need from the additional voltages? If it's just a low-power supply for opamps, generate that internally. If you can get by with +5V at 1.5A, use a micro-USB power input. The next step up is +12V at up to 5A using a DC coaxial jack, typically 5.5mm / 2.5mm or 5.5mm 2.1mm sizes. If you need a little more power, +19V at 5A is also common.

author: b_force
author_rank: Super Contributor
timestamp: January 11, 2017, 08:05:11 pm
content: What kind of 'synthesizer project' are we talking about?Which voltages and current do you need?etc. Maybe a little bit more information.It's not difficult to connect these Meanwell supplies (and they work pretty well).But if you're saying that you're not completely comfortable with it, maybe it's a good idea to have a look for some alternatives first.Maybe there is also someone in 'the neighborhood' who could help you with a few things?

author: JanJansen
author_rank: Frequent Contributor
timestamp: January 12, 2017, 02:39:04 pm
content: Quote from: b_force on January 11, 2017, 08:05:11 pmHi, the most important thing is that i get +12 , -12 , +5 volts.The amperage is low, just a few opamps + some 8 bit chip.I am looking to alternatives, i dont wanto use 2 DC walladapters,AC adapters dont exists anymore for some reason, else i would prefer that to make the + & - voltages, i dont know how also.So whats left is use 220 volt, i dont wanto, i cannot find another way to get the + & - voltages, exept have 2 walladapters.If you have any suggestions i would like to hear it.Quote from: DBecker on January 11, 2017, 07:33:32 pmI dont wanto have a cord going into my wooden box i make, i wanto use a socket with on/off button, panelmounted.Dont i need some fuse also ?I realy want a bipolar power supply, some circuits you cannot make with single supply, alot, not everything,so yes, after all these years working with single supply, i wanto make the things i cannot make with single supply.You mean with power brick = wall adapter ?I,m going to start something like this, only then smaller to begin with, same idea :