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Author Topic: Shure 527c PTT mic for shout box use  (Read 352 times)

Todd Friemuth

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Shure 527c PTT mic for shout box use
« on: September 20, 2022, 05:31:06 AM »

I recently found several Shure 527c PTT mics at an estate sale recently for $1 each. I am interested in trying one out with my shout box setup. My formal education is in chemistry and not electronics. Would someone more well read than myself in the electronics field be willing to glance over the schematic for this mic and see if its possible to terminate this mic to an XLR plug? Appears that some DC needs to be injected somewhere in the path to drive the internal amplifier circuit. Is this necessary and if so, would phantom power be too much and kill it? Any suggestions would be greatly appreciated.
Regards, Todd

Shure 527C
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Art Welter

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Re: Shure 527c PTT mic for shout box use
« Reply #1 on: September 20, 2022, 02:06:29 PM »

I recently found several Shure 527c PTT mics at an estate sale recently for $1 each. I am interested in trying one out with my shout box setup. My formal education is in chemistry and not electronics. Would someone more well read than myself in the electronics field be willing to glance over the schematic for this mic and see if its possible to terminate this mic to an XLR plug? Appears that some DC needs to be injected somewhere in the path to drive the internal amplifier circuit. Is this necessary and if so, would phantom power be too much and kill it? Any suggestions would be greatly appreciated.
Regards, Todd

Todd,
The 527c manual states "voltages exceeding 35 Vdc may substantially reduce the life of the microphone", so 48v phantom power may kill the amp circuit unless voltage is dropped. A dropping resistor (RL) may be prudent.

The mic element itself is dynamic and could be wired through the switch to pins 2 and 3 of an XLR without requiring the transistor amp, if your "shout box setup" has enough gain to not require a pre-amp.
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Re: Shure 527c PTT mic for shout box use
« Reply #1 on: September 20, 2022, 02:06:29 PM »


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