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exxos wrote: Mon Aug 04, 2025 2:11 pm
Yeah probably them. I just normally slap like 100K across them and then see if the voltage goes up or down a bit..
@exxos is probably right, but looking at a datasheet for Q3, which is a voltage reference, it could also be R11 & R12 since the external components for the TL431 determine the voltage that it gives as it's reference, at least from what I understand.
Screenshot 2025-08-04 at 15.29.43.png (217.04 KiB) Viewed 654 times
Just a thought, probably needs somebody who knows electronics very well to determine.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Yes I think there are two parts to it - one (TL431) generates the fixed reference voltage and the second part is the measurement (the stabilised divider feeding back from the 5v rail). I think its the second part (measurement) which would be adjusted against the first (fixed reference).
