Thank you for your patient answer. In my opinion, the two schematic diagrams have different capsules, and the schematic diagram of U89 has an extra resistor with R1 resistance value of 1G. I don’t understand the connection between them and the working principle , Sorry, I have so many questionsKhron said:Technically, that's the U87A schematic. But sure, I don't see why not. You'll notice that, despite that they're not used, the bias voltage generator still also contains the parts for the lower voltages as well. All you need is a 5-6 position switch.
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