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Did this just to check the component (Q4). I can't get it to turn on with a 100k resistor from the bottom of R12 to ground. Tried different pieces/boards but can't currently test it without R12 as I only have assembled boards. I hope it's not an error with the component - It's definitely a PNP...
Thanks for the input. The input into the base of Q4 is 'generally' consistent with the spice simulation - I'll take a closer look and report back with any new differences I spot.
Schematic onvention of signal flow noted. Thanks.
Upper node of R12 is at same voltage as emitter (36V). I'll try grounding bottom node of R12 (maybe via another resistor 100k?). Thanks.
Hi, I'd really appreciate some help with understanding the following level converter which is meant to convert the input signal (via C3) into the base of the PNP (Q4) to 3.3V/0V at the collector of Q5. The emitter of the PNP is at 36V and its base is driven with a signal that's meant to vary...
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