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I built my test mic and used a Panasonic WM-61A electret cartridge. I tried it without power and promptly got no where. Added a bit 'o power and it was good to go. I mounted the cartridge at the end of an aluminum tube and held the battery in a PVC body on the base end.
Attached are the datasheet for the WM-61A, it's response curve and the schematic I used.
Try the microphone direct to the computer (through a 100n capacitor), you may not need an amplifier.
A 555 will not handle a lot of power. The resistors and capacitor are there to set the frequency.
The software which solo2racr recommends seems to do all that you want including replacing the 555.
I guess I should rephrase my statement. All my PCs employ phantom powered mic jacks to accept unpowered electret mics. The DC that the electret requires is derived from the PC mic jack. I've always assumed that all modern PCs are wired this way.
So,.. if an external coupling cap is used between the electret mic and the PC mic jack you will be blocking the phantom DC that the PC provides and the electret mic needs to operate. After all, there's a JFET preamp in there.
Chris
Just with your diagram of the mic, is the output connected to the end of the negative lead on the mic or does it go over?
A dot will show a connection. Otherwise, it will "go over"
I have a honey jar to experiment on as well but i found out that it was either too damp or i was not reading the screen right when i hit it with a pen to get its resonance frequency.
Duke previously explained how to resonate a glass in order to measure its resonant frequency. What you did here is not what he described. Frequency counters, whether real or PC based require a reasonably steady signal for at least a few seconds or it will return erroneous results... And yes, jars are a bad candidate.
Chris
I got hold of the resonating frequency of 880 hz for the red wine glass and 3200 - 3280 hz for the honey jar. The honey jar was hard to do and took me about an hour to get it to resonate so it is still unsure what the resonating frequency is exactly. But the good part is that i managed to narrow it down. I'm happy about that.................................
I got hold of the resonating frequency of 880 hz for the red wine glass and 3200 - 3280 hz for the honey jar. .
if the homey jar of thicker glass and larger size than the wine glass ( most likely the case) then its resonant freq is going to me much lower than the 880Hz of the wineglass. NOT the many times higher frequency that you think you got
Dave