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Ac motor oscillator

2016-08-06 18:08  
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The oscillator frequency can be modulated in a narrow range,by change  Rl or R2.The R3/R4 ratio sets the second amplifier's gain to compensate for signal attenuation occurring in the phase shifters.  External source such as pulse or square wave can drive  the circuits.Left hand amplifier gain setting is smaller than the oscillation of the level that needs.The RC feedback network, and acts as a filter to output sine wave.
 

Three-phase ac motor driver 2