开云体育

Hey, Mark. I got this same idea (contact mic + trains) but unpopulated PCBs still lay around and look at me accusingly. The idea of guitar pickup seems great. As already mentioned above the rails may

Using Henry's procedures, you've been able to establish that the impedance of your meter is around 1M, not 10M as I had originally suggested as a possibility The 35% reduction in voltage measured at

Hi Mark It depends on who you talk to. I hope it works out and you succeed! Maybe you should ask Gibson for a set of classic pickups as well. I'm not kidding. ;-) Your story reminds me of a night

Am 31.10.24 um 00:43 schrieb Mark Day via groups.io: Don't. They have more than enough trouble already with people taking nude photographs of their girlfriends on the tracks. Railways and trains are

Good point about the rails not moving much through the magnetic field. I was actually planning on approaching the company who owns the spur line near our house and asking permission. My mentor in

I will try, but it will take some time. Many thanks!

Can you check the various voltages circled in red in both cases?

It really looks like the problem lies elsewhere, since bias voltage is correct in both conditions. If the capsule was leaky you would have significantly different readings.

Hi! I measured? the voltage at each end of the 4704 resistor and the capsule voltage in the working and non working state (viewing from the photo). When the NT1-a is in the warm-up phase (not

Hi Henry Many thanks for link and the detailed instructions! I bought the Mastech MAS830 in a real electronic shop about 35 years a

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