Inexpensive substition boxes for beginners - Page 1
Forum section: electronics / general

author: MikeK
author_rank: Super Contributor
timestamp: June 28, 2012, 03:49:04 pm
content: Just spotted these on Amazon. You'd be hard pressed to build them for less money.Capacitor substition box:http://www.amazon.com/Elenco-K38-Capacitor-Substitution-Box/dp/B0002BBQMIResistor substition boxes:http://www.amazon.com/Elenco-Watt-Resistor-Substitution-Box/dp/B0002KX76M/ref=pd_bxgy_e_img_chttp://www.amazon.com/Elenco-K37-Resistor-Substitution-Box/dp/B0002BBQLY/ref=pd_bxgy_e_img_b

author: olsenn
author_rank: Frequent Contributor
timestamp: June 28, 2012, 04:14:23 pm
content: I don't understand these... what's wrong with just using a potentiometer? Measure the resistance with a multimeter if you need to know where it's at

author: Simon
author_rank: Unknown
timestamp: June 28, 2012, 04:57:07 pm
content: They are much more accurate and can provide any value down to an ohm or less

author: Bored@Work
author_rank: Super Contributor
timestamp: June 28, 2012, 04:58:52 pm
content: And if you just look funny at a pot it already changes its value.

author: kripton2035
author_rank: Super Contributor
timestamp: June 28, 2012, 05:09:25 pm
content: Quote from: MikeK on June 28, 2012, 03:49:04 pmsorry but these boxes have "hard to get" values...I prefer these ones where you can specify the exact resistor/capacitor (even inductor) you want(except the minimum value of course...)http://kripton2035.free.fr/LabTools/lbt-resistordeca.htmlit will cost almost the same, but they will be really more usable...

author: MikeK
author_rank: Super Contributor
timestamp: June 28, 2012, 05:25:52 pm
content: Nice job on that. I wasn't able to read the "overall cost estimate" paragraph, though; the picture overlays the text. (FireFox 13.0.1)

author: kripton2035
author_rank: Super Contributor
timestamp: July 03, 2012, 05:22:56 pm
content: Quote from: MikeK on June 28, 2012, 05:25:52 pmsorry no problem with firefox 11... will check with other when I have some time ...by the way at the top of the page the link "original here" and you get the full text !

author: MikeK
author_rank: Super Contributor
timestamp: July 03, 2012, 09:08:28 pm
content: Just so you know, here's what it looks like in FF13 (Man, they've gone through 7 major releases in less than a year!)

author: Bored@Work
author_rank: Super Contributor
timestamp: July 03, 2012, 09:40:11 pm
content: Quote from: MikeK on July 03, 2012, 09:08:28 pmNo, they just changed their numbering schema. They now step the major number for every scheduled release, major or minor.Lots of trouble for admins around the world, because it broke update policies they had to follow.

author: elliott
author_rank: Regular Contributor
timestamp: July 04, 2012, 12:19:09 am
content: Quote from: MikeK on July 03, 2012, 09:08:28 pmSame in Chrome 20.

author: kripton2035
author_rank: Super Contributor
timestamp: July 04, 2012, 06:18:33 am
content: Quote from: elliott on July 04, 2012, 12:19:09 amhi, same for the picture over the text in chrome 20 or for the numbering scheme ... ~)

author: elliott
author_rank: Regular Contributor
timestamp: July 04, 2012, 08:02:30 am
content: Quote from: kripton2035 on July 04, 2012, 06:18:33 amPicture over text.

author: kripton2035
author_rank: Super Contributor
timestamp: July 04, 2012, 12:20:14 pm
content: should be fixed. tell me if not. thanks.

author: urbanwriter
author_rank: Contributor
timestamp: July 04, 2012, 07:43:25 pm
content: Well... you cannot buy the box, the switches, the leads, the resistors (or caps in that case) but I'd note this.I bought the resistance and capacitance boxes as kits; upon completion I thought 'why did they make stuff that would absolutely frustrate a 10-year old beginner? And I'm pushing 60, fairly handy, and can read the instructions.The resistors I got were 10%. The switches are switches, how long mine will stay that way is questionable. The supplied leads and alligator clips make one appreciate the quality of IKEA product. The silk-screened faceplate is great except the indicator line on the knob doesn't line up with the silkscreening when using the keyed switch.And those are just the points I remember while I'm some distance away from them.Quote from: MikeK on June 28, 2012, 03:49:04 pm

author: Tepe
author_rank: Frequent Contributor
timestamp: July 04, 2012, 08:43:01 pm
content: Quote from: kripton2035 on June 28, 2012, 05:09:25 pmTrying to draw traffic to your site using content from this one?

author: kripton2035
author_rank: Super Contributor
timestamp: July 04, 2012, 08:56:03 pm
content: Quote from: Tepe on July 04, 2012, 08:43:01 pmno...summing up 3 or more threads on this site to one page on my site ...grouping things on the net over the same subject.so that people that don't want to runs lots of readings can have the essential on my site.

author: Tepe
author_rank: Frequent Contributor
timestamp: July 04, 2012, 09:14:30 pm
content: Quote from: kripton2035 on July 04, 2012, 08:56:03 pmIan's box is rather nice looking, btw

author: kripton2035
author_rank: Super Contributor
timestamp: July 05, 2012, 06:47:22 am
content: my box is finished ald looks like ian's(so I didnt put any picture of it it is already on the site...)

author: Tepe
author_rank: Frequent Contributor
timestamp: July 05, 2012, 07:19:28 am
content: Quote from: kripton2035 on July 05, 2012, 06:47:22 amWhat is its dimensions (roughly)?

author: kripton2035
author_rank: Super Contributor
timestamp: July 05, 2012, 07:47:38 pm
content: 115mm x 65mm - height = 40 mmit's a velleman box (this one :http://www.velleman.eu/products/view/?id=7332)