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Just to report back that I hooked this up earlier to a raspberry pi and all working good..guess it's onto the next bit of my project which I may need to come back for help with at some point! The reason I wanted to set this up was to try and diagnose and get working my OPentherm setup with a Valiant...

Appreciate the help with this. I've stepped through the circuit schematic and as you suggested there was a break - the cathode's of D5/D6 appear to not have been connected through to the cathodes of D10/D11. I've bridged these together and all the checks work out fine now from what I can see, and al...

Hi - Thanks for taking the time to reply. I've checked the diode orientation and all looks ok , as does q1 which is a bc558. I get a couple of mv across d9, 170mv across d10 and 340mv across d11 . I get nothing across any of the three resistors r1,r2,r3. This is all with ok1 installed but ic1 remove...

I've now fixed this with a new 7805 and get 5v..but.. When I step further through the diagnostics, I get ok measurements for current and voltage on X1 in the first set of tests, but when I put in the OK1 and connect X1 to X2 I get about 26v on X2, and no change in this when I connect pin2 on IC1 to ...

Hi - hoping someone can help please with my issues.. I have built a new gateway, and am running through the diagnostics checks - between pins 5 and 14 of IC1 I am seeing around 6.9v though, instead of the 5v suggested. I can see this is reading off the 6.9 ish v between pins 2 and 3 of the 7805 volt...