Earphones and headphones.
Audio was / is one of my stumbling blocks. I am at lost here.
I need to test a small directional microphone whose sensitive element is an electret mike.
I collected earphones / headphones for years, some probably from OLD hearing aids or portable radios, walkmans, cellular phones, CDs reproducers, even those given away by airlines and much more unknowns. The awful diversity of their jacks (or are they plugs?) I find it overwhelming.
Any simple way or rule of thumb, to get a rough idea of their impedance, if that matters at all, and to select one or two I could use, no risking to damage the audio amp? Sole thing I know for sure I can forget stereo.
BTW, I am going to build a (tested-working) preamp for my electret mike. What should follow? Maybe my LM386 based amp that works OK with an 8 Ohms speaker?
The unavoidable suggestion to Google, is surely to be followed later by an equivalent amount of critics on the circuits I could propose.
For the moment I would prefer a one / two chips solution.
Gracias for any help.
Audio was / is one of my stumbling blocks. I am at lost here.
I need to test a small directional microphone whose sensitive element is an electret mike.
I collected earphones / headphones for years, some probably from OLD hearing aids or portable radios, walkmans, cellular phones, CDs reproducers, even those given away by airlines and much more unknowns. The awful diversity of their jacks (or are they plugs?) I find it overwhelming.
Any simple way or rule of thumb, to get a rough idea of their impedance, if that matters at all, and to select one or two I could use, no risking to damage the audio amp? Sole thing I know for sure I can forget stereo.
BTW, I am going to build a (tested-working) preamp for my electret mike. What should follow? Maybe my LM386 based amp that works OK with an 8 Ohms speaker?
The unavoidable suggestion to Google, is surely to be followed later by an equivalent amount of critics on the circuits I could propose.
For the moment I would prefer a one / two chips solution.
Gracias for any help.
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