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a Battery Box With Plug In Power Microphones: Better Recordings from PiP Mics On Loud Sounds With External Power | Suite101.com

://richard-mudhar.suite101.com/use-a-battery-box-with-plug-in-power-microphones-a140741[04/04/2012 12:11:37]

Use aBattery Box With Plug In Power Microphones

Better Recordings from PiP Mics On Loud Sounds With External Power

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Aug 19, 2009Richard Mudhar

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Battery Box (L) and recorder - Richard MudharRecorder plug-in-power is poorly specified and often too low to power the microphone properly on loud sounds leading to distortion onsounds like rock concerts.

Plug-in-power was introduced by Sony with their Walkman recorder range more than twenty years ago. Unlike professional phantommicrophone powering, manufacturers can implement it in various ways. Plug-in-power is rarely high enough in modern equipment toallow for a lot of headroom.

The result is clipping on loud sounds, which is bad enough, but where those loud sounds are sustained, like at a rock concert, thewhole recording becomes muddy and unclear. Concert tapers can get better recordings with a battery box.

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Why Electret Microphones Need a Battery Box to Record Loud Sounds Clearly

According to Shure (makers of the popular SM58 vocal microphone) a rock concert can reach 120dB SPL at the back of the hall. Usingthe values for a typical electret microphone capsule such as the Panasonic WM61A, the output signal is in the order of 1Vp-p at thisSPL. There just is not enough headroom since there should always be at least 1.5V DC across the capsule. Modern recorders often usea low voltage of 2-3V to power the microphone, and often 1V of that is lost in the series resistance of the PiP circuit. (see diagram)

The microphone output can be estimated from the sensitivity of -35dB relative to 1V/Pa. Since 1Pa is 96dBSPL (at 1kHz) the rockconcert can reach 120-96-35 = -11dBV or 0.28Vrms or 0.8Vp-p

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Schematic of a Battery Box to Power Electret Plug-in-Power Microphones

A battery box contains a battery and a replacement powering circuit for the microphone. These typically use a 6 to 9V battery to powerthe microphone via a resistor, in exactly the same way as the recorder's original plug in power circuit did. The key difference is that thebattery voltage is 2 or 3 times higher. Battery boxes are available from several companies such as Soundman, Sound Professionals andCore Sound.

Building a battery box is easy enough for someone who is reasonably handy with a soldering iron. Most electret microphone capsuleshave a current drain of between 0.5mA and 1.5mA and require a voltage across them of 1.5V up to a maximum of at least 8V. If a 9Vbattery is used with a 4.7k resistor, then the capsule will have between 1.95V and 6.7V across it depending on current drain. Puristswould adjust the value to give about 5V at the capsule, optimising headroom. However, the values indicated will give a greatmprovement in headroom for most electret plug-in-power microphones. The schematic is shown below.

Use a Battery Box for Better Sound with Plug-In-Power Inputs

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Mar 11, 2010 5:31 PMGuest :

Mar 16, 2010 3:33 PMGuest :

Mar 17, 2010 1:58 PMRichard Mudhar :

Mar 17, 2010 2:02 PMRichard Mudhar :

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Thanks again for another great article! I already built the piezo preamp with power supply box and now im looking forward tomaking this rather than spending a ridiculous amount on a commercial one!

Hi Richard. I made this device, but the voltage coming out after the resistors is 9.14v (no load), and it's 9.29v coming straight out of

the battery. I'm worried that it might be too much voltage for my OKM II classic microphones, because I know their battery box hasa 6 volt battery. Also, is there any danger to the recording device when it receives the initial voltage from the battery? Thank you!

The current from the OKMs will load down the terminal voltage, it sounds like you are measuring the open circuit voltage at the micinput. If you want peace of mind, temporarily rig a bench PSU instead of the battery and bring up the voltage while the mics areconnected, & monitor the mic voltage. Or use a couple of 3V lithium coin cells. If you look carefully at the mic you will see I useOKM Classic with this rig, they work just fine :)

> look carefully at the micwhat I meant was if you look carefully at the pic...

The 1uF keeps the terminal voltage out of the recorder, and will discharge into the input impedance of ~6k. You can put a 47k bleedresistor from the outputs to ground to discharge the plug-in surge, I don't bother personally
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3.0 W Mono With Fast Gain Ramp

Delivers Louder, Clearer Audio.TI.com/TPA2028d1
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use a battery box with plug in power microphones_ better recordings from pip

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