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Voice modulation on 24V DC

Question asked by radovan on May 11, 2016
Latest reply on May 16, 2016 by KJBob

Hello, could anobody recomend me some power-efficienty solution for voice modulation on 24V DC (2VRMS)? I had an idea to use DC-DC converter ADP2442 - as step-down from 30V to 24V with voice modulation connected to FB input (via capacitor). This solution did not work - seems the regulator has some internal compensation, voice signal has not been modulated on output. Output current sould be maximum 300mA. I would like to avoid solution with class-AB amplifier, I suppose there is possible some more "clever" solution. Thanks for advice