On Mon, Jan 23, 2017 at 6:48 PM, Adrian Graham <wit...@binarydinosaurs.co.uk> wrote: > On 22/01/2017 20:10, "Tony Duell" <ard.p850...@gmail.com> wrote: > >>> That looks like an opamp to me, with bias pins connected to GND? >> >> Does it? It looks like a 555 timer to me at first glance. I would have >> expected another >> capacitor from pins 2/6 to ground though. >> >> 1 Ground >> 2 Trigger (linked to threshold, and to output via a timing resistor) >> 3 Output (driving the MOSFET) >> 4 Reset/ (pulled high via a resistor) >> 5 Control Voltage (decoupled to ground) >> 6 Threshold (see 2) >> 7 Discharge (not used here) >> 8 Vcc > > I didn't think of a 555 in that scenario but that makes sense. I've marked > it as such for now, cheers!
Is there another capacitor from the 2/6 junction to chassis? Any other components around? It might be one of the special SMPSU ICs, but it doesn't instantly ring a bell with me. > > Tonight it's 'address pins and why I get inconsistent results on a logic > analyser while looking at everything that touches A7' :) Short from A7 to another pin? Failed address latch? -tony