Search found 11 matches

by mglynch
Wed Apr 07, 2021 1:11 am
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

Like $50 in materials is going for $600 - $1500. It hasn't worked yet. Koz :roll: ;) I didn't say the knowledge, skills, and time involved in making these doesn't warrant the price tag. But, what the hey, it is what it is. And if I have fun doing difficult things, and it can save me hundreds, or a ...
by mglynch
Tue Apr 06, 2021 6:51 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

Why is anyone still soldering in the 21st century? Why is someone trying to build a microphone from parts in the 21st Century. I think I left my skycar double parked. Screen Shot 2021-04-06 at 10.52.51 AM.png Koz :lol: Exactly, why are we still soldering and not driving sky cars in the 21st Century...
by mglynch
Tue Apr 06, 2021 11:48 am
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

I expect I can crimp with Neutrik connectors, at least I hope I can. Because microphones use such low level signals, I would recommend soldering crimp connectors rather than relying on the crimping. Crimp + solder is much more reliable than just crimp (and very easy to solder a crimped connector). ...
by mglynch
Tue Apr 06, 2021 3:48 am
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

There's another fuzzy rule here. The noise in a system is determined by the first electronics that the microphone signal hits. It will never get better than that without extraordinary gymnastics. A line-in connection might have a noise floor of about -60dB with a show volume of about -6dB. That's p...
by mglynch
Mon Apr 05, 2021 10:38 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

I am hoping that the line-in is sufficient, w/o a pre-amp, for recording and for computer analysis. That is one part of my question. If I put an XLR connector or Headphone jack directly on the microphone audio line, will this be sufficient... Microphones require a preamp and your TASCAM recorder ha...
by mglynch
Mon Apr 05, 2021 8:14 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

steve wrote:
Mon Apr 05, 2021 2:38 pm
mglynch wrote:
Mon Apr 05, 2021 2:24 pm
Any ideas on how I can get a decent inexpensive interface that will power the mic and pass the audio through to the computer or recorder?
You may be able to get help here: https://forum.pjrc.com/threads/38988-Bat-detector/
Interesting thread. Thanks for the link.
by mglynch
Mon Apr 05, 2021 8:13 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

steve wrote:
Mon Apr 05, 2021 2:13 pm
There's some relevant information about "Ultrasonic Applications for Knowles Electret and MEMS Microphones" here:
https://www.digikey.co.uk/en/ptm/k/know ... _id=810838
Thanks
by mglynch
Mon Apr 05, 2021 8:01 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

I will not actually be "upsampling", I will be recording at the data rate that I will use for analyzing the signal. If the hardware is running at 192kHz but you are "recording at 384kHz", that's upsampling. ;) If you want to upsample it's better to do it after recording because then speed/timing ar...
by mglynch
Mon Apr 05, 2021 7:07 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

You're designing a microphone. Knowles FG 23329 microphone I don't know that there is a pre-baked interface for the three bare wires and ground braid this microphone has. Screen Shot 2021-04-05 at 9.59.47 AM.png You don't plug it into anything. You're expected to solder those wires to a circuit boa...
by mglynch
Mon Apr 05, 2021 2:24 pm
Forum: Recording Equipment
Topic: Ultrasonic Recording
Replies: 21
Views: 688

Re: Ultrasonic Recording

I will not actually be "upsampling", I will be recording at the data rate that I will use for analyzing the signal. The Knowles FG series microphones are used in ultrasonic applications and have a published frequency response up to 100k and even higher, so I am not worried about the frequency respon...