[time-nuts] OT - DC-10 gyros
davidwhess at gmail.com
Fri Mar 29 01:15:47 EDT 2013
If I did not go the microcontroller PWM route I would use a Johnson
counter (twisted ring counter) to directly generate three 120 degree
phases. There is a good example here:
On Wed, 27 Mar 2013 21:55:32 -0400, Bob Camp <lists at rtty.us> wrote:
>If three phase is actually needed, I'd suggest something like a cheap PIC with three PWM outputs. Fairly simple R/C's on the outputs should be plenty good enough to filter out any crud. Good frequency stability / accurate phase shift / cheap. What's not to like
>On Mar 27, 2013, at 9:44 PM, kb0ebg at juno.com wrote:
>> Bill Ezell;
>> Your Gyro may require 3 phase, 400 cps, 28 vac, Sine wave.
>> A simple "Buffered Phase Shift Oscillator" for 400 cps can create the Sine Wave.
>> https://www.circuitlab.com/circuit/h6v28g/buffered-phase-shift-oscillator/https://www.circuitlab.com/circuit/bakd83/phase-shift-oscillator-ii/You will need to add an AGC to the output for frequency stability.
>> A "3 Phase Generator" can create the 3 phase output.https://www.circuitlab.com/circuit/m4u5nw/3-phase-generator/ Add 3 Amplifiers (one for each phase) to reach voltage/power.
>> If the Gyro is directional, it will take several hours to stabilize.
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