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I would think that the steel rails aren't moving enough for that to really work well (guitar strings move through the magnetic field, causing the signal... I don't know what the displacement of rails

But seriously, cool idea, I'm guessing you would not directly attach the pickup as you would with a piezo. I think the pickup needs a slight gap from the vibrating "steel". I actually experimented

dont get caught!

Ever since I built a few pairs of Jules' hydrophones, I have been interested in new ways to make recordings with things other than traditional diaphragm microphones. I have been thinking about

Re: Measuring capsule bias voltage, how and why — Some info here: https://audioimprov.com/AudioImprov/Mics/Entries/2016/7/4_Bias_Voltage_for_True_Condenser_Capsules.html As for the input

Ok. I will check it tomorrow and let you know the results. Thanks!

It seems likely that the meter will have an input impedance of c.10M ... most modern DMMs do. Yes, that is the capacitor.? It's physically smaller than the one fitted to the NT1 (C8 in this

Why do you think it's more likely the primary 0.1uF (100nF) ?capacitor? Do you mean this one? The whole area seems to be sealed.

* The Multimeter I own is a Mastech MAS830. I had a look at the specs ( https://www.mastech-group.com/global/en/mas830.html ) but I couldn't find any information about it's impedance. I have sent a

A DMM wil normally have an impedance of around 10M Ω. Can you check the make and model of your meter, to confirm that ? If 10M Ω is true , then a reading of 10V is low. The mic will work, but

Hi! I'm back in town and did the measurement. Across the two capsule wires it's 10.2V when the microphone is working. To check the voltage when the mic is not working, I have to wait until tomorrow

You should make the measurement both when it works and when it doesn't work. If the voltage is not correct when the mic doesn't work, that would mean that the culprit is the bias generator. If the

Take the measurement across the 2 capsule wires, where they are soldered to the PCB.? One terminal will be connected to ground, the other will be the output of the voltage multiplier low pass filter

Just to avoid any misunderstandings. Could you please be more specific. Where exactly should the measurement be taken? Another question would be when the measurement should be carried out. When the

What voltage at the actual capsule termination itself?... With a DMM that has an impdedance of c.10M - which is typical- then you you still measure something around 50v across the capsule...

Hi Jan! Here you will find the measurements. Red circle test pad: 15.2 Green circle test pad: 68.7 @Arjay1949 Thanks also for your explanations!

The EM258 has a very useful ouptut at 40KHz.? ?At 80Khz it's almost nothing -- although it will still register something, just above the noise! MEMS microphone capsules like those listed here:

The meter will do the job, though you cannot accurately measure the capsule voltage like Arjay1949 already said. Capsule voltage will indeed be 73V, not 100V or more like I first said. That was based

Primo EM258 goes up to 80 kHz.

Hi all - Any recommendations for cheap-ish electret elements that go up to 40kHz? Thanks!