K9AY and Bi-dir beverage controller

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!! Preamplifier GAIN * With the '''variable ATT''' you can set gain of the Preamp as you need. * '''Range is 0 to 17 dB''' * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_1.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_1-850.png|noborder]
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