[ARC5] Carbon Mic Replacements

[Roy Morgan]

On Mar 24, 2016, at 10:22 PM, J Mcvey via ARC5 <arc5 at mailman.qth.net> wrote:

> Just had a thought to check the voltage ratings sinvce this is a higher voltage application than where they are usually used (3.3-5v)

I am learning a bit here: I thought electret microphones were basically an open circuit, so do not draw current.  I have a couple here and intend to use them soon.

> Sure enough, some are rated as low as 2V, so putting a 2V zener or resistor across the module will help.

What “module” does the zener go across, the electret element?  (Wouldn’t that limit any audio the thing produced?)  Or maybe you mean the entire amplifier/adapter.

> I have used them with a 3300 ohm series resistor on 5V supplies with good result, so I am surprised by the 2V spec.

I need to understand a bit more before I hook one up.

Roy

Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958