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! Tonight it's 'address pins and why I get inconsistent results on a logic analyser while looking at everything that touches A7' :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?