Not having much luck, so I'll turn to Twitter: I need to model the Darlington pair from a ULN2003 array. The NPN BJT models I have available are 2SC1815/945, 2N3565/3643/3704/3904/5190/4401/4124/5210/6292, and BC237B/548C/817-25. Which would be the closest to use?
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Usually, 2N3904 is a good bet. In this case, I'd suggest 2N4401, since the current capability is a little higher.
For what it's worth, this is in an audio circuit (weird, I know). Driving 0-5V, tops, as some of the parts are CMOS. First linked PDF on this page, the audio board schematic is on the left half of page 29: https://www.arcade-museum.com/pinouts-game/9676.html …
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The circuit model is going into MAME's netlist system, which is more or less akin to SPICE (to the extent that SPICE models for analog parts can be used in a pinch), as this arcade game used discrete analog circuitry for its sound effects.
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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I think the 2N4401 should be fine here. It's just used in an open-collector configuration for level-shifting, so I don't think the transistor type will affect the quality of the sound.
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By the way, the pinout on the EXTEND line has a misprint. IC5 is shown with input 13 and output 14, and that should be input 3 and output 14.
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