Bench Power Supply(yes.... another topic!) - Page 1
Forum section: electronics / testgear

author: edmundopt
author_rank: Regular Contributor
timestamp: February 13, 2014, 06:33:54 pm
content: Hello,I'am looking for a long term bench power supply, what I need from the power supply is :at 3.3v 10milivolts steps are welcome for testing microcontrolers and peripheralsat 5v , 50 or 100 milivolts are enough, TTL and IOsat 12 and 24 i have relays, microswitches, sensors.at 24v, well, I normally use step down regulators from 24v to 5v or 3.3v it saves another power supply on the designs.but, I can get a very good 24v power supply about 60€, so the bench power supply can only have 15volts.I have spent some time searching, and the name Aim-TTi appears allways with people saying they are good.anyway, I am quiet interested in theese:Aim-TTi PL155 wich is 0V - 15V @ 5A or PL303 wich is 0V - 30V @ 3A (they are the same price)http://pt.rs-online.com/web/p/fuentes-de-alimentacion-de-banco/0155383/for 312€Aim-TTi QL355 wich is 0V - 35V @ 5A# or QL564 wich is 0V - 56V @ 4A# (they are same price)http://pt.rs-online.com/web/p/fuentes-de-alimentacion-de-banco/7531450/for 442,80€I really like the front panel of the PL155, but they mentioned the analog potentiometers limited time life, but I really like them, the QL has extra features and full digital control!Please provide sugestions, alternatives, and is the QL a good investment ?

author: HKJ
author_rank: Super Contributor
timestamp: February 13, 2014, 06:41:48 pm
content: I have been using two PL155-P for two years with computer control. There they work very well.For manual adjustment I do not like the coarse/fine, but prefer a multiturn adjustment. On the PL155 you can lock the adjustment to a limited range, this helps.

author: free_electron
author_rank: Super Contributor
timestamp: February 13, 2014, 06:43:24 pm
content: TTI supplies are very good. I;ve used them for years.

author: edmundopt
author_rank: Regular Contributor
timestamp: February 13, 2014, 07:04:15 pm
content: Quote from: HKJ on February 13, 2014, 06:41:48 pmthe PL155-P is 490€, wich is more then the more advanced QLhttp://pt.rs-online.com/web/p/fuentes-de-alimentacion-de-banco/0457734/The interface with the computer can be a add-on module, and if so, I have some chances of making one, it's what I do everyday.If you could provide some pictures of the interface card, it would be great.

author: HKJ
author_rank: Super Contributor
timestamp: February 13, 2014, 07:14:54 pm
content: Quote from: edmundopt on February 13, 2014, 07:04:15 pmWith the QL you also need the P model to get the interface.The PL155-P has a network interface, if you do your own programs this is very easy to use and does not require any drivers.Quote from: edmundopt on February 13, 2014, 07:04:15 pmNot at the current time, they are running 24/7, if you ask me later I might be able to get some pictures from a new one I have one order (Supposed to be deliver week 12 or before).

author: edmundopt
author_rank: Regular Contributor
timestamp: February 14, 2014, 05:28:14 pm
content: Quote from: free_electron on February 13, 2014, 06:43:24 pmAny chance you can provide pictures?

author: rstoer
author_rank: Regular Contributor
timestamp: February 14, 2014, 06:15:58 pm
content: I have the QL355TP, which is the triple output version of the QL355P. It's a great power supply - No overshoot, very stable and precise. I believe the accuracy and stability is where this model outperforms the PL155 series. However, it too is only 5A to 15VDC and 3A to 35VDC. The QL564 gives you the most flexibility in voltage vs. amperage. The only negative I can think of with the QL355TP is that I wish the fans were quieter under light or no load.

author: edmundopt
author_rank: Regular Contributor
timestamp: February 14, 2014, 07:26:15 pm
content: Quote from: rstoer on February 14, 2014, 06:15:58 pmSo you also have the one with the PC interface, I really would like to see some photos of the insights of this PSU, I think the PC interface is an addon card, and if so, I could save some big € and get the QL355 wich is 442€.I also went searching for service manuals for the PSU, lots from Agilent PSU's and some of TTI products, but not for theese models, are they provided printed when you buy PSU ?

author: rstoer
author_rank: Regular Contributor
timestamp: February 15, 2014, 02:34:12 pm
content: The interface is an add-on card but if you're thinking of reverse engineering it to save some money, good luck. I happen to have a photo I took when I first got mine. Here it is...

author: idpromnut
author_rank: Unknown
timestamp: February 15, 2014, 04:38:34 pm
content: Quote from: edmundopt on February 13, 2014, 06:33:54 pmPerhaps I am misunderstanding here, but you use a 5V regulator with a 24V input?Isn't that a bit much of a step down for the regulator?

author: edmundopt
author_rank: Regular Contributor
timestamp: February 15, 2014, 07:34:23 pm
content: Quote from: idpromnut on February 15, 2014, 04:38:34 pmA little bit off topic , but no, a decent 5v switching power supply will cost arround 40€,there are cheaper but I normally use meanwell brand, and for getting up to 1000mA from 24v is with a switching regulator like lm2596 or even better is not an issue, then use a linear regulator for the 3.3v stuff and you get very stable supply.This is valid for most of my work, but it would be very bad for low power or portable systems.

author: edmundopt
author_rank: Regular Contributor
timestamp: February 15, 2014, 07:42:36 pm
content: Quote from: rstoer on February 15, 2014, 02:34:12 pmThank you! So, W3,W2,W1 is the must have!My choice is the PL303, I think it is enough for my specifications.About the interface, I will make it bluetooth and LAN, because it's very easy, RS232 is going down the hill theese days so maybe an internal connector to PWR, GND , TX , RX.I have some experience with microchip and that will be my next hobby work.When I start I'll make a topic with all the sugestions from you guys, I also have experience with Qt(up to 4.8.5) and the software will be cross plantaform.If anyone woulk like to point if the QL355 deserves the extra €€, please says so, I'am buying PL303 tomorrow!