想問邊度有人代整線性牛？？

billymud

kefana 發表於 2013-3-8 19:28
先唔該2位

我個magic tv 用外置2·5吋hd.

建議你買 "K 仔" 。。。。

taiwan PSU

Keces DC115

zoneaudio

billymud 發表於 2013-3-8 20:40
建議你買 "K 仔" 。。。。

k仔呢隻layout靚好多，另外個隻萬用板都幾流，
billy兄好介紹^_^

billymud

zoneaudio 發表於 2013-3-9 11:25
k仔呢隻layout靚好多，另外個隻萬用板都幾流，
billy兄好介紹^_^

師兄，唔敢話好介绍 。只係提示樓主米買 Yu 姐。
隻 Yu 真係唔夠班。。

zoneaudio

billymud 發表於 2013-3-9 11:57
師兄，唔敢話好介绍 。只係提示樓主米買 Yu 姐。
隻 Yu 真係唔夠班。。 ...

線性牛有OPAMP做SERVO調聲會方便D,
唔洗下下焊粒CAP出來攪一大輪
分立元件+-5V-24V,8A都有套KIT係度,
不過較聲要換野MA煩,遲遲都未開工

darkfrank

kenneth_obee 發表於 2013-3-8 10:26
For DIY, it's hard to control the cost. Because of quantity and your mindset.
quantity - you usual ...

how about cense 森士？

http://item.taobao.com/item.htm? ... &id=12841971140

Its cheap and i saw some ppl in china forum said its better then 安捷倫...

obee

btw, I am ex-user of KECES DC116:
http://www.keces.com.tw/2_product/P1205001/P1205001.htm

雙組輸出的機種DC-116：
1. OUTPUT I為5V（3A）/ OUTPUT II為12V（3A）

My version is dual outputs with 5V and 12V. I checked the transformer inside and it writes 30VA. If the information written on the transformer is correct (30VA), then the output voltage and power as it claims is incorrect (誇大了), because
5V,3A=15VA + 12V, 3A=36VA
Total is 51VA!

Note that, linear PSU usually has efficiency of 80% only, if the transformer is 30VA, the power rating in output should not more than 24VA....

I just want to warn those who want to buy KECES, don't expect to use it to drive large current devices (e.g. 12V "real" 3A), in that case, the transformer will be overloaded and will become very very hot!

obee

I once tried to use my KECES to drive my broadband modem, the original switching PSU of the modem said it is 12V, 1A. And I used multimeter to probe the current and it is "real" 1A at 12V, so it requires 12VA. But when I use KECES solely power up this modem, the KECES PSU gets quite hot after running for whole night. So the next day I unplug it and just use KECES to drive SoTM (12V) and Squeezebox Touch (5V)

billymud

街外牛，不強求、不強求。

obee

If compare the PSUs in photos provided by Billy ching, it seems that Yu's PSU is 足火. So for high current application such as NAS, one should buy Yu's PSU.

heven

kenneth_obee 發表於 2013-3-8 15:34
是的。
我跟諸師兄談過有關做linear PSU 賣，他說這會是他未來的工作之一。

Kenneth c hing, 發燒 ----->即是有藉口用錢買嘢  我遲遲未行動就只是關注安全問題
外國成品不菲, 所以有質量好的DIY set, 咁就一流, 好似砌PC咁, 跟manual做, 就萬冇一失啦