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i am looking for suitable replacement for SSM2166 (mic preamp)...pls suggest the best solution

In our applications we have observed that SSM2166 is vulnerable/susceptible to Radio Emissions (with AM modulation) from near by VHF system. In order to overcome this pls suggest the alternative for SSM2166.....

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  • Dear Mr. Bob,

    I had made the circuit...47uH in series and 0.01uF in (for each line of Mic_HI and Mic_LO) shunt to ground. And tested for the RF susceptibility. I didnt got any improvement. When ever near by VHF system operating at 118MHz to 134MHz goes into Tx mode, i am getting continuos whistle type of noise/audio. If i remove SSM2166 in my circuit, then system is OK. But i have no chance i have to use SSM2166 in my system. And I increased order of the flter to further cut off the RF energy into the audio system. But no improvement.

    Please suggest the suitable circuit or how to overcome this problem.....

    Thanks & Regards,

    Naveen

Reply
  • Dear Mr. Bob,

    I had made the circuit...47uH in series and 0.01uF in (for each line of Mic_HI and Mic_LO) shunt to ground. And tested for the RF susceptibility. I didnt got any improvement. When ever near by VHF system operating at 118MHz to 134MHz goes into Tx mode, i am getting continuos whistle type of noise/audio. If i remove SSM2166 in my circuit, then system is OK. But i have no chance i have to use SSM2166 in my system. And I increased order of the flter to further cut off the RF energy into the audio system. But no improvement.

    Please suggest the suitable circuit or how to overcome this problem.....

    Thanks & Regards,

    Naveen

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