From: kludge@panix.com   
      
   Harvey Sanenbum   wrote:   
   >Does anyone here know the electret specs for the old Zoom H2?  I   
   >recently had one go bad and I have removed the four electret elements.   
   >I plan on using the one pair with 90  degree separation as a plug-in for   
   >my other Zoom H2.  I know the Zoom can be set to automatically power the   
   >electrets, but I want to have the option of using separate bias voltage   
   >from a 9V battery and would need best load resistor and capacitor specs   
   >for the circuit.  Thank you.   
      
   I don't now the parameters but most of those electret capsules use the same   
   FET-IC anyway.  Give it a try.   
      
   If you're going to use them as unbalanced devices with a 9V battery, you   
   have only two components to worry about.  Use a capacitor that is 10uF or   
   larger (a 10uf cap gives you a -3dB point of 20 Hz into a 600 ohm load...   
   double the capacitance and you halve the corner frequency... double the   
   load impedance and you halve the corner frequency).   
      
   As far as the resistor goes, start with 2.2K and try it.  Does it overload   
   too easily at high levels?  If so, reduce the value which will increase the   
   current through the capsule.  You don't know what the maximum current rating   
   on the capsule is, so stay conservative.   
   --scott   
   --   
   "C'est un Nagra. C'est suisse, et tres, tres precis."   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)