Anyone bought anything from RK Education?

I've certainly bought the products, I don't think directly from them but via ebay or amazon. Not had a problem, but to be fair if he has personal issues going on it can seriously distract.

I notice right on the front page for the RK Education web site there's a big green box directing you to "Documentation", have you tried looking there?

RK Online Store Documentation

Believe me I've looked through the entire site, and if you look in the schematics link every single one is a 'page not found'.

While I have every sympathy for someone undergoing difficulties, it's not good leaving people high and dry who have paid money for their products.

All I can do is keep banging him, plus tracing the circuit as best I can and making an educated guess.

Don't suppose you've bought that particular product by any chance RKP20Servo.

@Brew Man - if you follow @ntp’s link, (for documentation not schematics) in the list shown is one called ‘RKServo PCB Component List and Instructions’ which links to the following page:

https://files.ekmcdn.com/rkeducation/resources/other/rkpservo-component-list-and-instructions.pdf

Is that what you are after?

No, that's not the same thing. I've looked at that two or three times hoping it would somehow miraculously transform into the product I have joy. There seems to be information on just about everything they do except for RKP20Servo.

I think I'm going to have to laboriously trace connections to/from the resistor connections. That way I should be able to narrow it down to two going one way and two going another. I'll then have a 50-50 chance of getting it right. If it's wrong I can then switch them around, assuming that is, if it's wrong it doesn't damage anything.

There is a contact us form and a direct email address telling that if you need more information to contact them.

I've tried the email address, I'll try the form. He was responding to me when I was chasing up the product, but now when I want the documentation he's gone quiet.

Well I've checked continuity from/to the resistor arrays and established that:

one pair of arrays, i.e. 8 resistors are connected between the PICAXE data outputs and the Servos and the other pair are connected between the PICAXE inputs and the switches and associated LEDs.

One pair of arrays are valued at 10R and the other pair are valued at 330R, so I'm taking a guess that the higher values will go to the LEDs and the others to the Servos. Will try that way round when I build it.

I see what you mean about no sign of documentation for that one, and on the product page there's a review/comment from a year ago mentioning lack of assembly instructions.

Yeah, I've pretty much given up on him now. I think I've got it right though from yesterday's investigation. Fortunately I was able to determine the placement of the three discrete resistors from the picture, though there has been a design change in that one of the resistors is a different value to that supplied and a power input rectifier has been changed to a LED. I think I'll change that back to a normal rectifier diode as per the picture. Interesting that the reviewer in spite of there being no documentation still gave it full marks, though he seemed to be talking about the pre-built version.

All in all I think they're another one to avoid in the future.