Had a go at building the Ruby http://www.runoffgroove.com/ruby.html and she doesn't want to work..
In the absence of anything more than a volt meter I guess I'm stuffed when it comes to fault finding?
You can actually do a lot with a multimeter, well ... enough, anyway, the rest is done in your head.
(http://www.runoffgroove.com/ruby.png)
What voltage is is on the battery, the supply rails on the build, actual pins 4 and 6 on the actual chip?
What is the voltage on pin 5?
What is the voltage across the 3k9 in the FET Source?
In the meantime use a screwdriver or scriber to make sure all solder joints are connected only where they should. Forget to cut a track, put in a link?
When you say it doesn't work, what is it doing? Nothing at all? Low volume? Weird noises? Chip getting hot?
yey she works!!!
I think I was driving too much power into her off the PC when testing.. lowered the input volume (as the input voltage was significantly higher than a suggested guitar voltage) and she worked straight away.
Usable volume although does really need fully turning up with the hifi speaker I'm using.
Quote from: joecool85 on February 04, 2014, 12:33:53 PM
When you say it doesn't work, what is it doing? Nothing at all? Low volume? Weird noises? Chip getting hot?
She is a bit crackly but I think that's just noise from when I touch the case of the pots to adjust them ( for instance ) - is it worth/good idea to ground the pot cans to earth?
Quote from: Katieris it worth/good idea to ground the pot cans to earth?
Yes. These are normally grounded somehow in almost all equipment.
Get it mounted in a case of some sort, biscuit tin, diecast hobby box...
I'm mounting it all inside an old hi-fi speaker now it's working. I know hi-fi speakers aren't ideal but for this little project should work fine. I'll solder wire to the pot cans and then to the zero volt rail.
She's running off a 12V transformer feed btw, I have loads of transformers so easier than messing with batteries!! :)