Differenze
Queste sono le differenze tra la revisione selezionata e la versione attuale della pagina.
| Entrambe le parti precedenti la revisione Revisione precedente | |||
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notes:hd44780-vs-st7066 [19/11/2018 19:04] alez [Hack howto] |
notes:hd44780-vs-st7066 [19/11/2018 19:25] (versione attuale) alez [The Hack] |
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| Linea 52: | Linea 52: | ||
| | R6 | 18k | 130k | | | R6 | 18k | 130k | | ||
| - | Original values meant a V0 from about -0.18 to +1.2 V (duty 50% gives about +0.5V) | + | Maths: |
| + | |||
| + | V0 = R4/R3 * R2/R1 * Vr - R4/R3 * (R2+R1)/R1 * R6/(R5+R6) * Vcc | ||
| + | |||
| + | Note that Vee is not critical. | ||
| + | |||
| + | Original values meant a V0 from about -0.027 to +1.35 V (duty 50% gives about +0.65V) | ||
| Modified values mean a V0 from about -2.5 to -0.5 V (duty 50% gives about -1.1V) | Modified values mean a V0 from about -2.5 to -0.5 V (duty 50% gives about -1.1V) | ||
