Low Cost Programmable Decade Resistor for Prototyping Convenience

[gerrysweeney]

You could make it smaller if you make the circuit like this but then the user would need to 'calculate' the value.
http://www.robotshop.com/elenco-rs-500-resistor-box.html
And then you would need to remove decade out of the name also

Kinda misses the "simplicity" requirement

[IanJ]

Arrived today......nice one Gerry.

Ian.

[gerrysweeney]

Arrived today......nice one Gerry.

Ian.

Your welcome Ian, thanks for your support. hope its useful, I look forward to seeing it used in one of your projects

Gerry

[IanJ]

Arrived today......nice one Gerry.

Ian.

Your welcome Ian, thanks for your support. hope its useful, I look forward to seeing it used in one of your projects

Gerry

That'll be the power supply project......am in the thick of it right now, and this'll come in useful around the op-amps. 

Ian.

[quarks]

Hello Gerry,
I like your videos  and that looks interesting, so I just ordered two.
bye
quarks

[bingo600]

I also had to order two ...

/Bingo

[ElektroQuark]

It can be interesting to order directly, bypassing eBay and Paypal fees, if Gerry likes it.

[gerrysweeney]

Hello Gerry,
I like your videos  and that looks interesting, so I just ordered two.
bye
quarks

Thank you for the order, much appreciated. Glad you like the video's, thank you for watching them

[gerrysweeney]

I also had to order two ...

/Bingo

Thank you for the order, glad you like the project.

Gerry

[gerrysweeney]

It can be interesting to order directly, bypassing eBay and Paypal fees, if Gerry likes it.

I was thinking about putting a PayPal buy button on my blog page but I have not worked out what I need to do yet.  e-bay does take care of postage and stuff so its fairly convenient, I am not sure exactly what the fees are for e-bay, I think about £1, it would seem though that you pay each time you list and the listing only lasts 30 days.   If its convenient for you to order directly I don;t mind too much although I am not sure how I will deal with postage. I will see what I can put up on my blog

Gerry

[Thor-Arne]

That is not the most obvious thing to achieve, first you need to upgrade your PayPal account to a Permier account.
Then you need to add the various products to PayPal, you can add shipment and sales tax in there to. One thing that's quite convenient is that you can have PayPal manage how many items you have for selling.

After this you get some html code to add to your site. I haven't found how to make a view-cart button though.

You can find these options in: PayPal -> My profile -> More Options -> My selling tools

[gerrysweeney]

That is not the most obvious thing to achieve, first you need to upgrade your PayPal account to a Permier account.
Then you need to add the various products to PayPal, you can add shipment and sales tax in there to. One thing that's quite convenient is that you can have PayPal manage how many items you have for selling.

After this you get some html code to add to your site. I haven't found how to make a view-cart button though.

You can find these options in: PayPal -> My profile -> More Options -> My selling tools

Hi,

Thanks for the tips, I will have a look later and see what I can do.

Gerry

[ddavidebor]

Should be nice, in the next manufacturing run

-banana instead of screw contact
-a "plus" version with gold pin and jumper (or a self made jumper whit some little little pcbs for better quality) should be a good idea
-more dissipation for low value

[gerrysweeney]

Should be nice, in the next manufacturing run

-banana instead of screw contact
-a "plus" version with gold pin and jumper (or a self made jumper whit some little little pcbs for better quality) should be a good idea
-more dissipation for low value

It is possible to replace the terminal block with banana sockets, there are holes in the PCB to accommodate this.  Not sure how beneficial the gold plated jumpers would be, the tin plated ones do seem to perform OK.  I suppose it would be feasible to make some without any pin headers and people could install their own options.
Good point about better dissipation on the lower values, its just space that would concern me.

Thanks for your comments.

Gerry

[quantumvolt]

Very nice and probably much easier to program than programming children (see 13. below) . I hope the stock lasts until the 19th (I have an ex wife caught in an endless support loop and two unprogammable children so I am broke until then).


...

9.
to schedule as part of a program.
10.
Computers. to prepare a program for.
11.
to insert or encode specific operating instructions into (a machine or apparatus): We'll program the bells to ring at ten-minute intervals.
12.
to insert (instructions) into a machine or apparatus: An automatic release has been programmed into the lock as a safety feature.
13.
to cause to absorb or incorporate automatic responses, attitudes, or the like; condition: Our parents programmed us to respect our elders.
14.
to set, regulate, or modify so as to produce a specific response or reaction: Program your eating habits to eliminate sweets.

...

http://dictionary.reference.com/browse/program

[ddavidebor]

Should be nice, in the next manufacturing run

-banana instead of screw contact
-a "plus" version with gold pin and jumper (or a self made jumper whit some little little pcbs for better quality) should be a good idea
-more dissipation for low value

It is possible to replace the terminal block with banana sockets, there are holes in the PCB to accommodate this.  Not sure how beneficial the gold plated jumpers would be, the tin plated ones do seem to perform OK.  I suppose it would be feasible to make some without any pin headers and people could install their own options.
Good point about better dissipation on the lower values, its just space that would concern me.

Thanks for your comments.

Gerry

Yes i know it's possible to replace them, i've suggested for you. A banana one is more useful.

It's a bit expensive i know, but you can let people pay for it separately with option on ebay.

[gerrysweeney]

Yes i know it's possible to replace them, i've suggested for you. A banana one is more useful.

It's a bit expensive i know, but you can let people pay for it separately with option on ebay.

Oh ok, I understand now. The problem is with assembly, its more difficult to produce in lower volumes when there is different constructions. Perhaps a version where there is no terminal block installed. I will have a think about it.  thanks for the suggestions

Gerry

[gerrysweeney]

Very nice and probably much easier to program than programming children (see 13. below) . I hope the stock lasts until the 19th (I have an ex wife caught in an endless support loop and two unprogammable children so I am broke until then).


...

9.
to schedule as part of a program.
10.
Computers. to prepare a program for.
11.
to insert or encode specific operating instructions into (a machine or apparatus): We'll program the bells to ring at ten-minute intervals.
12.
to insert (instructions) into a machine or apparatus: An automatic release has been programmed into the lock as a safety feature.
13.
to cause to absorb or incorporate automatic responses, attitudes, or the like; condition: Our parents programmed us to respect our elders.
14.
to set, regulate, or modify so as to produce a specific response or reaction: Program your eating habits to eliminate sweets.

...

http://dictionary.reference.com/browse/program

Good find, option 14 pretty well describes the use of the work "programmable" for the decade resistor too

Gerry

[Chet T16]

Mine arrived this morning, thanks!

[gerrysweeney]

Mine arrived this morning, thanks!

Glad it arrived ok, I hope its useful for you

Gerry

[IanJ]

Hi all,

And here's mine in use!........does the job nicely.

I might actually modify mine to have a couple of breadboard sockets at the end for easy hook up/removal.

Ian.

[gerrysweeney]

Hi all,

And here's mine in use!........does the job nicely.

I might actually modify mine to have a couple of breadboard sockets at the end for easy hook up/removal.

Ian.

Hi Ian,

Thats great, thanks for posting..its nice to see it in use. Your project looks interesting too, nice job on the display

Gerry

[reagle]

Cool design!
Another suggestion- try using www.tindie.com for selling them. A lot more friendlier than ebay and lower fees. (Speaking from experience as I sell there)

[gerrysweeney]

Cool design!
Another suggestion- try using www.tindie.com for selling them. A lot more friendlier than ebay and lower fees. (Speaking from experience as I sell there)

Hi,

Thanks for the suggestion, its already on there:

https://www.tindie.com/products/gerrysweeney/seven-decade-programmable-resistor-1r-9999999r-1-500mw-gerrysweeneycom/

Gerry

[iloveelectronics]

Received my order today, 7 days from the UK to Hong Kong    Thanks!