>> Curiously, the "middle" voltage for the audio ("analog ground" >> if you will, +4.5V) is generated from +5V, not +9V. I wonder >> why that is. [It's 4.75V, not 4.5V; seems I cannot even get a resistor divider right.] > Maybe because +5V is already very close to what was needed? Yeah, probably. This way, the maximum deviation from the 4.75V voltage (due to mismatches in the resistors) is smaller than if it was derived from 9V. Here's the circuit, esp. useful if you want to laugh at how I got to 4.5V ;-) Segher +5V ____________ | | | X | X 1R | X X | 10R X +------ out X | | X | X 4R | X | | +------+ | X 10R X X | === Message was sent through the cbm-hackers mailing listReceived on 2012-05-15 10:00:47
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