BK precision 1715 power supply - Page 1
Forum section: electronics / general

author: shadowless
author_rank: Regular Contributor
timestamp: August 22, 2011, 07:11:12 pm
content: Bought a 2nd hand BK precision power supply 1-60v 2amp for cheap. Took it apart to do the some cleaning up and replace the broken connector posts. Good thing about BK power supply is that they include the calibration information in the instruction manual so it is easy to tune it with my agilent 1752b.Initially i was thinking of changing the volt meter to a 3 1/2 digit module. Well, the fine adjusting knob is quite hard to use. A light touch and it will move quite a bit so i don't think it will be easy to set the voltages on 3.5digit meter at all.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 22, 2011, 09:39:09 pm
content: Congrats .. mostly because it haves a real transformer in it.I would love to had the calibration manual of my Kenwood PD35-10,but the hope dies last.

author: shadowless
author_rank: Regular Contributor
timestamp: August 22, 2011, 11:13:54 pm
content: I was hunting for a kenwood too and i found the manuals but no calibration info.You can find them on texio japan site.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 23, 2011, 06:21:07 am
content: Quote from: shadowless on August 22, 2011, 11:13:54 pmI am searching over five hours and i did found all theKenwood Train... and now that I have all the info at hand I am reading your message.Kenwood train =Kenwoodusingnikketechno.jpwho becametexio.jpThankfully I found the true Users manual in TEXIO and so I am happy.Tomorrow I will try my luck about filling a Japanese web form, asking for it.The good part about loosing your self in yahoo.jp , is that you find lots of pictures and Japanese blogers.

author: saturation
author_rank: Super Contributor
timestamp: August 23, 2011, 11:38:51 am
content: Those knobs maybe easy to mod for better performance. A simple trick is take another pot of the same resistance, ideally a Bourne multiturn, and clip it with alligators to the fine knob variable resistance pins, so the 2 resistances are parallel each other. For example, if the pot is 10k, you now have 2 in parallel gives 5k, the midpoint setting. Set the B&K pot to maximum resistance and turn the unit on. If the parallel adjuster gives you better control, then replacing the whole pot or adding one in parallel may do.Quote from: shadowless on August 22, 2011, 07:11:12 pm

author: shadowless
author_rank: Regular Contributor
timestamp: August 24, 2011, 02:59:33 pm
content: Thanks for the pointer on the pot. Any suggestion where i can find a cheap multi pot, not those trimmer pot.If i can find a multi turn pot i would just swap the fine adj pot out.

author: Unknown
author_rank: Unknown
timestamp: August 24, 2011, 08:04:15 pm
content: Good multi-turn pots are typically not very cheap in my experience. You can sometimes find them cheaper on ebay, but shipping may negate any savings.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 24, 2011, 08:46:14 pm
content: Quote from: shadowless on August 24, 2011, 02:59:33 pmThat is a Chinese one ? In ChinaAlm is right, the worthy ones cost about 25-40$ its unit ( BOURNS).And believe it or not, on a PSU that the usage of the pot is frequently,only the worthy ones will do the trick for about 8-10 years .The cheap ones comes close to 17$ and they do not last at all.scroll this thread and read the data-sheet.https://www.eevblog.com/forum/index.php?topic=354.msg4136#msg4136

author: saturation
author_rank: Super Contributor
timestamp: August 25, 2011, 10:04:55 pm
content: Good ones alas, are expensive, $25-30, and you can't be sure how good China versions are. Another option is a 3rd pot, just find the right resistance and a place to mount it; it will be a fine-fine adjust.Quote from: shadowless on August 24, 2011, 02:59:33 pm