| Products > Test Equipment |
| Audio via Sound Card Line In and Spectrum Analyzer |
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| kirk spec:
I already ordered the Behringer U-PHORIA UMC202HD just to be sure and not the Xtuga which I almost ordered. But I'm not sure my laptop can power the Behringer. My Microsoft surface laptop can't even charge an IPad 9th gen. Can any powered USB hub do? Or would it introduce noises? What powered USB hubs do you guys use for the Behringer? Also my analog signal can reach 2 to 3 volts. What voltage the UMC202HD Line In can accept? If my signal is 3 volts and I used a resistive divider to make it 1V to match the Line In. Can it distort the frequency? |
| jonpaul:
best interface is none...We use a simple 4 cond 3.5 mm male phone to 3x RCA cable. PC is Lenovoo Carbon X1 NO amps, sound card, just the PC onboarrd ADC. Free audio SA SW is SoundCard Scope, for speech analysis INFORMANT, RTpitch and RTspect, all free. The best solution is the simplest. Jon |
| kirk spec:
My Microsoft Surface 2017 notebook has no audio input. I found in my things a 4 in 1 Venton USB HUB with mini-usb power supply port (where you plug the 5V adaptor to the mini-usb slot). I just want a rough idea how the USB Hub is able to route the power from the external mini-usb adaptor to one of the USB slot when the slot is already getting power from the notebook USB? Won't the mini-usb adaptor power and notebook usb power collide? I need to know in preparation to power the Behringer. Th |
| jonpaul:
Hello again, the old 3.5mm><USB headphone adapters that used to come with Logitech HP 10..20 yrs back had an ADC in the USB dongle. We have many usually free at street and garage sales or with the HP. Fine for most uses Jon |
| noisyee:
What's your signal like and what THD performance do you want? Mic-In have a high gain mic-phone preamp which is for very small signal but degradation the system THD performance. Line-In usually mean bypass that preamp and direct feed input to the ADC, which is good for 1 Vrms or 2 Vrms "standard" line level. A typical PC onboard sound card will have better than -50dB THD for mic-in and -80dB for the line-in, which is good enough for most case. But be careful some mic-in have AGC that can not be by-passed, and the frequency response is not that flat (some will have low cut or voice boost :palm:). A dedicated sound card will have better performance, and also other feature like variable gain and attenuation setting. Which is good for different signal level. I'd recommend try onboard sound card first to see if it suits your need. Entry level dedicated sound card usually don't have enough performance advantage over onboard sound card. Professional sound card is much much more expensive(almost 1 decade higher). If you really need high performance comparable to an audio analyzer but with budget price, the E1DA Cosmos ADC may be a good choice. It has good reputation among some audio hobbyists. Also be careful with the OS sound mixer, it sometime can ruin your test. If your software support input method like WASAPI or ASIO, the use it rather than DS(DirectSound or System Sound). If not, make sure you have disabled system sound effect, mic-phone boost, noise reduction, etc. |
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