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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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  • Hello Jon,

    Thanks for sharing my problem.

    Yes, these mic-hi & mic-lo lines are twisted shielded pair and are going to opposite ends of the centre tapped primary transformer. And the centre tap is connected to ground. Basically there is an antenna which works in VHF band near by the audio system. The power output from the VHF transceiver when in Tx mode is around 40W. So, at times when the transceiver in transmission mode, we will listen whistling/whining background noise and resulting unable to transmit through the transceiver. The audio system is housed in a metallic box and well grounded.

    Some how the RF esp.VHF is entering into audio system and creating oscillations in the total system.

    Pls suggest me how to aviod this RF entering into the audio system.

    The secondary of the transformer terminals are connected to IN+ and IN- of SSM 2166 IC.

    Thanks & Regards,

    Naveen S

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  • Hello Jon,

    Thanks for sharing my problem.

    Yes, these mic-hi & mic-lo lines are twisted shielded pair and are going to opposite ends of the centre tapped primary transformer. And the centre tap is connected to ground. Basically there is an antenna which works in VHF band near by the audio system. The power output from the VHF transceiver when in Tx mode is around 40W. So, at times when the transceiver in transmission mode, we will listen whistling/whining background noise and resulting unable to transmit through the transceiver. The audio system is housed in a metallic box and well grounded.

    Some how the RF esp.VHF is entering into audio system and creating oscillations in the total system.

    Pls suggest me how to aviod this RF entering into the audio system.

    The secondary of the transformer terminals are connected to IN+ and IN- of SSM 2166 IC.

    Thanks & Regards,

    Naveen S

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