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  • remis's Avatar
    09-06-2019, 07:05 AM
    remis replied to a thread Bat detector in Audio Projects
    Yes your are right! I forgot the simplest way.... I suggest to start with typical audio spectrum, close to typical application( 3Khz signal with SR=44Khz ) to try understanding and confirm the effect of MIC CTRL...
    462 replies | 34014 view(s)
  • remis's Avatar
    09-05-2019, 07:40 PM
    remis replied to a thread Bat detector in Audio Projects
    Ok i understand. Other intermédiate solution could be : compile an oscilloscope :Use the bat detector as a simple oscilloscope to check the fullscale, and the level and the signal seen by the ADC. Some people will...
    462 replies | 34014 view(s)
  • remis's Avatar
    09-05-2019, 06:34 PM
    remis replied to a thread Bat detector in Audio Projects
    Hello Corbee, Interresting Test.Could-you add more reference about the generator*? I think you have too much sub-systems in your test-setup. The first step is the conducted test with a well knowed amplitude ,...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-31-2019, 09:41 PM
    remis replied to a thread Bat detector in Audio Projects
    To add detail message #316: I improve decoupling with 470nF 0805 ( or 0603 ) : They are soldered directly beetwen supply pin and groud. It could be the next pin, (if pin is gnd) or i use the ground plane. For TFT I...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-31-2019, 06:18 AM
    remis replied to a thread Bat detector in Audio Projects
    Hi Corbee, I don't have any date for the manual. Your are spending a lot of time on software. I can work on this document. I just need more information. You can read first draft manual in #371, if you have time. Answer...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-30-2019, 07:29 PM
    remis replied to a thread Bat detector in Audio Projects
    I plan to offer one box to a friend*: Thus I need a short manual. Please use doc 2003 win version or same in Libre office under Linux:easier to modify for every body if you want to add your information, correction ...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-29-2019, 09:36 PM
    remis replied to a thread Bat detector in Audio Projects
    If VCC/2 is perfect : low impedance point DC value but no AC signal . Two solutions: _reduce R6, R5 to small impedance, comparred to R2 and increas C6. Ok but this solution will increase the DC supply current into R5,...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-29-2019, 08:33 PM
    remis replied to a thread Bat detector in Audio Projects
    Hello Don't mix the issues. Did you have any osciloscope? I suggest you to check your Dc bias around TRamplifier without any signal, without AOP. like in message #317 HArmonics could also be the result of both...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-27-2019, 04:49 PM
    remis replied to a thread Bat detector in Audio Projects
    yes it works with : Turn RL until Press_Default. Press RL : switch from yellow to white Turn RL to select Press_User Press RL ; switch from white to yellow dont change param ; keep defaut to 10? others doesnt...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-27-2019, 03:09 PM
    remis replied to a thread Bat detector in Audio Projects
    I'm sorry I need to detail .I miss something. Please insert correction. Regards Rémis PowerON Turn RotaryLeft until TE_low PressRL : T_Low switch from yellow to white Turn RL : Topdisplay show chnage value...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-25-2019, 07:59 PM
    remis replied to a thread Bat detector in Audio Projects
    Hi Corbee, Your explanation seems to be clear, but I 'm not able to save the parameters : I miss sometihings, they are not stored. during startup EEPROM is always 0000h Rémis
    462 replies | 34014 view(s)
  • remis's Avatar
    07-25-2019, 08:14 AM
    remis replied to a thread Bat detector in Audio Projects
    Hi, Thanks corbee for your last code version. I can not compile it, but I can download the hex file. I really appreciate the TE low value définition : we can exclude mic noise,audio earable noise and songs from...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-19-2019, 09:18 PM
    remis replied to a thread Bat detector in Audio Projects
    hi mic for ultrasonic is like farnell ref 1007349. I use it 30 years ago for my first HT analog receiver. it it is a passiv device. no spurious. Edwin : your test is very interesting. It could be both issue :...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-19-2019, 02:52 PM
    remis replied to a thread Bat detector in Audio Projects
    I use the one transistor amplifier in the modified schematic from Edwin. ( see my previous amplifer measurement simulation and description). The TFT is operating: One picture show the noise floor : no mic connected, ...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-19-2019, 11:20 AM
    remis replied to a thread Bat detector in Audio Projects
    Hello. I confirm what I saw in my message 239: Today with ''new'' parts. ICS40730, ICS4720 have some spurious signal in opposite phase at 27Khz, 10mVpp. It wil be canceled with diff AOP. I add also spectrum view: with ,...
    462 replies | 34014 view(s)
  • remis's Avatar
    07-18-2019, 03:19 PM
    remis replied to a thread Bat detector in Audio Projects
    Hi Cor Simply restore the state, same as it was just before last power on (mode , SR value , center frequency, spectrum view, gain, volume) , will be a great improvement. Or may be with specifi menu entry : ''store...
    462 replies | 34014 view(s)
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About remis

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About remis
Location:
France
Interests:
radio, signal
Occupation:
RF Engenieer

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