| X9C103 solid-state digipot: This circuit enables you to control an X9C103 by a standard potmeter. This little digipot has 100 wiper positions. The S/N ratio is -120 dB, which is very good! |
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1x AT90S1200-12PI 1x X9C103 (Xicor) 1x 78L05 2x 1N4007 1x 8MHz resonator 1x 22pF 1x 47uF/16V 1x 100n polycarbonate 3x 100n multilayer 1x 10k ohm 1x 820 ohm 1x 100k trimpot 1x 10k lin. potmeter |
| The software.... Here you can download the X9C103 datasheet. Here a part of the assembly which does the trick, well the rest is up to you. (X9C103 can be replaced by X9C303. The X9C303 has a logaritmic wiper scale) |
| X9C103 controlled by mechanical rotary encoder: The diagram shows how a Xicor X9C103 can be connected to a shaft encoder (aka: 2bit rotary gray encoder) controlled by an AT90S2313 AVR microcontroller. Each step is 1/100 of the totall audio level at the input (attenuator) Clockwise turn is volume increase, counter clockwise turn is lowering the volume. |
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1x AT90S2313-10PI 1x X9C103 (Xicor) 1x 78L05 2x 1N4007 1x 4MHz resonator 1x 47uF/16V 1x 100n MKH 2x 100n multilayer |
| The software.... Here you can download the X9C103 datasheet, and also the datasheet of the shaft-encoder. More info about Xicor digipots can be found on their website. Or check Xicors application notes and/or study their datasheets. |
