tcdk

Well.. the amp ain't working.

Will try to poll-twist some of the capacitors, think it could be one of them.

I can see at pictures of other Ruby's, that the 100uF capacitor on pin 7, is a ceramic type. The one I use is a electrolytic.

Not sure if that would do any different?

I now finished my ruby amp (I think)

Drawed an board-layout instead of using a hole-board, got the size down on 40x30mm

I tried to connect a 9V batteri and a small speaker - but can't realy seem to find anything I can use as input to se if it works ?

Any suggestions?

Hmmm....is that 40 ohms! That would indicate extremely thin wire (thinner wire is more resistant). You write the thickness as 0,2mm...you do mean by this 0.2mm right? It looks about right from the picture, difficult to tell...0.2mm I think is about the size of a high e string...A pickup wire would be very difficult to see in such a pickup so it isn't that small. Perhaps your wire is particularly brittle or something.

I found the winding calculator to be misleading BTW and counting a little unreliable. Better to wind as neat as possible...a reasonably neat but not over tight coil should fit in a 3mm space with room to move and will be probably between 150-200 turns. You may need to test the meter on something known, but as the bobbin becomes fullish, scrape a bit of the wire without breaking it and test to that point. As the coil gets bigger the resistance will rise more rapidly also...so it may take a while to get to 6 ohms but the last 2 ohms may only take another 20 turns...so don't panic. Also, you can stop at 7 ohms and it will still be ok.

Keep trying...

Yeah - I also see it as 40 ohm .. The bobbin is also not near full.

Think I will buy some VERIFIED wire tomorrow (on a role, saying 0,2mm)

I tryed with another vernier caliper (bether quality) and it showed more 0,1mm then 0,2mm

The shop where I usaly buy my stuff, has a older owner, who can be pretty special.. He dosen't care if the parts he sells is right. So I think this wire is 0,1mm..

The other place - they don't know a **** - Im a electronic noob, but seems to know more about it than they does (They always ask me to search on theire computer to find the right part etc.)

Just took a 1.5K ohm resistor (5% tolerance) and measured - it said 1.48K. That should be more than fine.

Another thing - A friend of mine is a bassplayer. Anyone tried to make this sustainer for bass? Should there be any differens other than a little in the "pickup" ? When I get my own working, I think I will build one to him as a present! Sweet me (blarh)

Now I will try to find some of my components around the house - had a little rush this morning, so coulden't clean up before leaving for work. When I got home that cats has been playing with my stash!

Why diden't I leave the power on even though 12V isen't very much.

You break 0.2mm wire winding by hand...impossible!!! Don't ever try winding a pickup then, that stuff is hair width (0.063mm or something), now that breaks. Trying to wind it by machine is not advisable BTW, it should only take about 10 minutes or so and is much better as more care can be taken in the process.

Hmm, I mesuared the wired to be 0,2mm, but I can break it just like breaking a hair.

I now wounded 112 rounds to test the winding (112 rounds from the pickup-wiring calculator) and measured the ohms.

Here is the result:

And a picture of the wire:

Ok, will try with the BFW11 instead.

This thin 0,2mm wire sucks! It breaks! almost when im at 60-80 rounds

I have glued some acrylic on the bobbin to make it 3mm height. What I was talking about with the height, was the "pins" on the pickup. Should the be even height?

A little update.

Drove to the nearest electronic-shop.

He diden't have the J201 Jfet, but sold me an BFW11 instead:

http://pdf1.alldatasheet.co.kr/datasheet-p...ROLA/BFW11.html

How the heck do I connect that one? Thats one old bastard!

What comon part, can I use instead of J201 ? With the same quality

(Edit: I got some 2N5551 - would that do it?)

Hi all!

I just started on a Sustainer project, and have some questions!

1: I can only seem to find lacquered cobber wire in 0,2mm - Will that work? or should the wire be unisolated (without lacquer)

Here is a picture of the wire:

2: Would any ~5w amplifier do the job? or will you suggest building one ecxactly like eg. JEM ?

3: My "bobbin" has varius "pickup" heights. Take a look at this picture:

Does this matter? Or should I cut down the height, so they will be equal height?

Thanks for this endless thread!