The THAT1510 just requires +15 V and -15 V. In fact anything between +5 V ... +20 V, -5 V ... -20 V is guaranteed to work, but the specifications apply at +15 V and -15 V.
The +48 V is probably meant for a phantom supply for the built-in preamplifiers of professional condenser microphones.
The +48 V is probably meant for a phantom supply for the built-in preamplifiers of professional condenser microphones.
in the on / off part of the circuit they pull in+ and in - up to +48v. now granted that's through a 6.8k resistor on both sides, but that seems significant. If I float that connection do you think it would still be "on". I don't see why not, but then again I don't know why they have it pulled up to 48v either. pulling down to ground to turn it off makes sense, but pulling it up to 48v doesn't.
48 V and two well-matched 6.8 kohm resistors is the standard phantom supply circuit for professional condenser microphones. One would normally turn it on when using condenser microphones and off when using dynamic microphones. The THAT1510 works with and without it.
I'm using a condenser capsule, but after analyzing the circuit I think it's safe to leave the 48V pullup off the IN+ and IN-. I ordered boards this morning so I'll find out in about 10 days if it worked or not.
well the adapter I bought that was supposed to break out the microphone from the usb-c side channel did not work. it was supposed to be a charge and headphone/mic cable, but it didnt even pass through 5v ...
Plugging a usb-c cable directly in and soldering jumpers to the ac_decoupled out and ground gave me some audio, but I don't have the emi filter in place yet so the auto gain was all over the place while it was fighting with radio signals. hopefully tomorrow I can get an emi shield in place
Plugging a usb-c cable directly in and soldering jumpers to the ac_decoupled out and ground gave me some audio, but I don't have the emi filter in place yet so the auto gain was all over the place while it was fighting with radio signals. hopefully tomorrow I can get an emi shield in place
So this is kind of part of a larger project and to get the full scope I'll have to start at the beginning with my headset. I bought the Fostex T60RP s.
stock ear cups vs the Xenon Pads from modhouse audio
Replaced the stock strap with the deerskin one from modhouseaudio
insert Yak Down
This paracord color is called argon
Made some custom cables
stock baffle
vs polymer clay with tungsten dust and tungsten granules
stock ear cups vs the Xenon Pads from modhouse audio
Replaced the stock strap with the deerskin one from modhouseaudio
insert Yak Down
This paracord color is called argon
Made some custom cables
stock baffle
vs polymer clay with tungsten dust and tungsten granules
Replaced the stock 2 conductor cable with a 4 conductor (doubled up) of heavier gauge and I think it also looks cooler
stock 3.5mm unbalanced jack
vs 4.4mm balanced pentaconn jack
I was in and out of those headphones so often tweaking things I eventually started to strip out the wood so I added threaded inserts
I promise this will make sense here in a moment
stock 3.5mm unbalanced jack
vs 4.4mm balanced pentaconn jack
I was in and out of those headphones so often tweaking things I eventually started to strip out the wood so I added threaded inserts
I promise this will make sense here in a moment
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Some laser cut parts for the microphone boom
Going to hinge it together something like this
So here is how the mic and the headset are related
in the first picture the screw heads haven't been counter sunk yet, the edges haven't been rounded off, it hasn't been cleaned up. just finished enough for a test fit
Still haven't cleaned it up in this pic, but you can see how it will mount and be able to slide up and down for adjustment
Going to hinge it together something like this
So here is how the mic and the headset are related
in the first picture the screw heads haven't been counter sunk yet, the edges haven't been rounded off, it hasn't been cleaned up. just finished enough for a test fit
Still haven't cleaned it up in this pic, but you can see how it will mount and be able to slide up and down for adjustment
A satisfying SNAP
they self center and magnetically locate. they twist around the center without mechanical linkage
they self center and magnetically locate. they twist around the center without mechanical linkage
Having some of the pieces cut out of thinner brass to save weight. added a washer plate to tie things together. we'll see if the brass or the engraved 7075 aluminum looks better
New pieces should be in on friday
New pieces should be in on friday
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Now I wanted some shielding wire for the capsule connections in brass, but I could only find copper
so a little transmutation is in order
so a little transmutation is in order
bent some brass plate into a circle to encapsulate the brass EMI shield and serve as a solder point for the 12 brass rings that will facilitate the shock mount which will be bungie cord between those rings and the holes in the circuit board. the top right shows one of those shock mount rings. still in rough shape
