![]() Input buffer would fix it but I'm not considering it economically ![]() It may be not suitable for circuits with e.g. C6 capacitor has to be desoldered - its measured capacity is 80nF and it is connected with power supply for mic thus it would severely limit usable frequency range if we'dīeware that with this simple setup oscilloscope input would be equivalent to 2V voltage source with 250k resistance in series.make sure to disable AGC and set fixed volume (by default plugin is calibrated for Volume = 0) for sound input associated with card (Win7 below):.Measured voltage range to 0-6V noise measured in this configuration = 20mVpp resistor in series (I've used 120k and software is calibrated for it by default) seems like the cheapest way to extend.This offset source is relatively high - short-circuit current is 20uA adding 120k resistor in series reduces it to 8uA there is 2.23V voltage (DC offset for ADC) on the C6 output impedance of.according to device properties reported by Win7 it offers 4410 Hz sampling.audio input is mono and two "live" contacts of mic jack are physically shorted together DLL is intented toīe generic (handle stereo cards also), but 2nd channel can be disabled (i.e.Point where DC signal component is not blocked: Unlike the previous "C-Media" USB sound card I've tested and similar card from "C-Media" sound card version without any control keys. Judging by the descriptors chip inside is identical as in previously described ![]() Product string: C-Media USB Headphone SetĪudio Device Class + HID (composite device) Not necessary settings for this specific device. Part is used for audio volume and mute control and it functionality is slightlyīroken - same as with multimedia keyboard it controls default sound card settings, Sound cards available with price $1.1-$2 depending on vendor.ĭevice markings: HX2010-0705, production date 40th week of 2013 (or later?).ĭevice enumerates as composite device: sound card + HID input. This USB sound card that presents itself as C-Media is one of the cheapest
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