Products > Test Equipment
Cheap and Small Dynamic Signal Analyzer?
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KE5FX:
Note that many "192 kHz" sound cards still have a reconstruction filter cutoff in the 20 kHz vicinity.  All of mine do, as I just found out the other day when I wanted to use it to capture a 100 kHz signal.
Berni:

--- Quote from: KE5FX on August 17, 2020, 07:22:50 am ---Note that many "192 kHz" sound cards still have a reconstruction filter cutoff in the 20 kHz vicinity.  All of mine do, as I just found out the other day when I wanted to use it to capture a 100 kHz signal.

--- End quote ---

You can just swap out the capacitors in that filter to bring its response up. The audio ADC chips themselves do have a flat response all the way up to nyquist.

Also a good idea its a proper sound card that supports USB Async audio class, this removes a sample rate conversion step that can mess with the audio data.
exe:
What are recommended sounds cards for the job?
electrolust:

--- Quote from: gigavolt on August 15, 2020, 01:45:14 pm ---I was watching Dave's new video on magnetic field shielding and I realized: why haven't I seen any cheap hobbyist grade DSAs on the market?  Up at high frequencies there's the nanoVNA which is dirt cheap and fits in my pocket.  I'd expect that a DSA which is basically just some nice ADCs with the right software would be a prime candidate for creating something in a similar vein.

Right now I'm actually using an audio interface and some custom software for rooting out noise, but it all feels really hacked together and having something that you just plug in and take a measurement with would be amazing.

--- End quote ---

Maybe Virtins "Multi-Instrument" fits the bill for you? It works with any sound card with ASIO, which includes the QA401. It works with other interfaces as well.
electrolust:

--- Quote from: maxwell3e10 on August 16, 2020, 02:03:00 am ---Surprisingly there doesn't seem to be a new instrument-grade low-frequency spectrum analyzer.

--- End quote ---

eh?

Signal Hound USB-SA44B (1Hz)
Bode 100 (1Hz)
Tek RSA7100B (1Hz)
Keysight E5061B (5 Hz)

If you need <1Hz there are various lock-in amplifier based designs, commercially "instrument-grade" available. SRS, Zurich seem the 2 most prominent.

Also there are commercial ADC / sound card designs, "Multi Instrument" (Virtins) which interfaces with a large selection of hardware, and PicoScope 4262 are ones I'm aware of. Oh, and of course QuantAsylum, mentioned earlier, But it's really focused on audio.
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