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  1. Special Thanks Ford!. for direct use of An Electret Mic , I think your are right. But how about indirect input(Pre Amplified Microphone Signal to MICIN1 pin)? I mean like whats I did, when we connect Output of an PreAmplifier to MICIN1,Which Determine F-3db freq? As you know, output impedance of Amplifiers are very low, so I think input resistanse of MICIN1 pin should be considered . Maybe that Input impedance combined with decoupling Cap (in this case 100nF and in my schematic C6=1uF) make HPF ? So whats your Idea? What is Maximum capacitor(C6) value that i can use for this circui
  2. Hi Ford ! thanks for your answer. Do you said that because of Matching Impedance Theory? But there is a problem! we need a Decoupling Cap in input of MICIN1 pin of Allwinner; That i saw in here it is 100nF. [see attached image] With that 100nf and even 4Kohm, we make a HightPass Filter with F-3dB = 400 Hz!? So, Sounds like somthing go wrong! because the Amount of That HPF must be designed to acheive as low as possible frequency (Like 1 Hz or even lower).
  3. hi all! my problem is simple! Is there a way for measuring or know, input impedance of Microphone input pin (MICIN1) ? in case C.H.I.P , but because it's prossesor is Allwinner A13(=R8), it must be same. thanks in advance
  4. Hi All, As you know, with Default OS presented by FreandlyARM, Many apps & Features are disabled. for example, it hasn't nano editor, python3 and either it's most known libraries,flexibility for installing most of new apps, and so on. I really can't tolerate this situation that i had to try many ways, just for installing one python3 library!! . while your Beta OS is extremely better in this fields, but it is suffers too from Somethings like AUDIO Output(& maybe input?), Usb device compatibility , OTG support, and long boot time. So,you will be glad all, if you can work harder
  5. Hi Dear Tkaiser! Thank you for your great work in Modifying Linux to prepare a better OS for our IOT projects. But, there is some problem with beta images that released in Armbian Site that i couldnt solve them till now : OS Checked : Armbian_5.17_Nanopineo_Debian_jessie_4.6.7 Armbian_5.17_Nanopineo_Debian_jessie_4.7.2 Armbian_5.17_Nanopineo_Debian_jessie_3.4.112 Armbian_5.17_Nanopineo_Ubuntu_xenial_3.4.112 1. Connecting WiFi Dongle (MAIN PROBLEM) : Mine is EDUP 802.11N Dongle that works properly in Raspberry pi B+, But in Any Armbian OS in Nanopi NEo , I cant use it. Error is :