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  • 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...
    437 replies | 31600 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...
    437 replies | 31600 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 ...
    437 replies | 31600 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,...
    437 replies | 31600 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...
    437 replies | 31600 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...
    437 replies | 31600 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...
    437 replies | 31600 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
    437 replies | 31600 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...
    437 replies | 31600 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 :...
    437 replies | 31600 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, ...
    437 replies | 31600 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 ,...
    437 replies | 31600 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...
    437 replies | 31600 view(s)
  • remis's Avatar
    07-17-2019, 08:45 AM
    remis replied to a thread Bat detector in Audio Projects
    Hi, I'm using LTC spice for many year . You are right :"There is always a difference between the simulation and reality" But LTC spice use model used during the design of IC. ( should be different for analog device, or...
    437 replies | 31600 view(s)
  • remis's Avatar
    07-16-2019, 09:05 PM
    remis replied to a thread Bat detector in Audio Projects
    you can add common mode noise source in serie with 05vcc, left on R11 and R12. all parts left C2 and C3 simulate Mic differential signal: for better accuracy we need to add 750 ohm output mems impedance ( read...
    437 replies | 31600 view(s)
  • remis's Avatar
    07-16-2019, 04:00 PM
    remis replied to a thread Bat detector in Audio Projects
    Hi, See attached schematic LTC file for ADA4807 AOP,used in differential mode: Low noise, available at farnel and others. Simulation OK. I plan tu use it to remove common-mode noise on MIC output.
    437 replies | 31600 view(s)
  • remis's Avatar
    07-05-2019, 05:33 PM
    remis replied to a thread Bat detector in Audio Projects
    Hello I check also the NPN amplifier with BC847C. Less gain to begin, and not saturate. I performed simulation and measurements wich are compliants. I suppose a typical 50mVpp input signal to start the analysis. I...
    437 replies | 31600 view(s)
  • remis's Avatar
    07-05-2019, 04:22 PM
    remis replied to a thread Bat detector in Audio Projects
    HEllo Many thanks to Edwin for this document and associated work: https://drive.google.com/file/d/1Uu2kTnleLcJJ1JrEzeiRPV7JJSGXqBRW/view I start from this schematic page 8. I check the power supply and decoupling...
    437 replies | 31600 view(s)
  • remis's Avatar
    07-02-2019, 11:23 AM
    remis replied to a thread Bat detector in Audio Projects
    HEllo I confirm the good result with Pe1pwf work: Windows, Arduino 1.8.7, Teensyduino 1.46 codes and libraries here: https://drive.google.com/file/d/11BgRDCXH6Un10M2vmeA1CUw1kpG-siBx/view I copie Librarie (...
    437 replies | 31600 view(s)
  • remis's Avatar
    06-25-2019, 07:56 PM
    remis replied to a thread Bat detector in Audio Projects
    Thanks Corbee for you support at every time... Now I confirm result with ...0.84pwf.hex and your parameters for audacity importation. I try at 192 Khz. I am able to here the drift in ultrasonic range ( generator...
    437 replies | 31600 view(s)
  • remis's Avatar
    06-25-2019, 06:03 PM
    remis replied to a thread Bat detector in Audio Projects
    I use in sd_config.h #define USE_MSC 0 ; I add #define BUILTIN_SDCARD in 0.86 main.cpp and #define HAVETM ligne 166 Compilation error remain : 'FRESULT' has not been declared for every call. I search again. I...
    437 replies | 31600 view(s)
  • remis's Avatar
    06-25-2019, 08:21 AM
    remis replied to a thread Bat detector in Audio Projects
    First Many thanks to all for your hard work. It is not totaly clear for a newbie like me. I will try you hex file after work. I try to summarize your modification, for arduino user under linux: first , keep your new...
    437 replies | 31600 view(s)
  • remis's Avatar
    06-21-2019, 10:16 PM
    remis replied to a thread Bat detector in Audio Projects
    Many thanks for your help....I dont have old sd micro. I continu with my SD HC in fat32. I download corberjune.ino.hex with old tools teensy duino : it works : I can see the message of Sd recording, Button stop work....
    437 replies | 31600 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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