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Search results

  1. J

    LoRa maximum range and speed

    Hi, I'm looking for wireless device which can send the log data to my PC. distance between PC and device will be around 3km. I have search few devices and I found that LoRa will be suitable for my requirement but not sure how much speed i will get at this distance? I'm planning to use...
  2. J

    Toe, Heel and Side size in PCB library expert and Altium Designer

    When i was creating a footprint i found that footprint create from PCB library expert and Altium IPC Complaint Footprint Wizard does not match. if both follows the same standard then it should give the same result. After that i have investigate the issue and i found that in Altium designer Toe...
  3. J

    MQTT Porting with microcontroller

    Yes I will port it on bare metal platform or with FreeRTOS
  4. J

    MQTT Porting with microcontroller

    How to port MQTT to any microcontroller? I download MQTT code from Github but din't understand how to use it for different microcontroller such as NXP,TI,ESP8266...etc Any body know how to get started with MQTT porting from embedded paho source code?
  5. J

    Looking for audio amplifier for Radio

    I've searched on aliexpress where majority of the IC's are from chinese make
  6. J

    Looking for audio amplifier for Radio

    Hi, I got easy design from ST TDA2822 but only problem is TDA2822 original chip from ST is not available easily from local supplier. Chinese supplier has cheap TDA2822 but not have idea whether it will work stable or not Any one has idea about TDA2822 chinese IC performance and stability??
  7. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    Not understood what you are trying to say
  8. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    @vfone Do you know why this is not working??
  9. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    Basically I'm using DRA818 module for walkie talkie application. In this module squelch level are configurable from 1 - 8 level and 0 - is for continuous scan mode. If I set 1 - 8 squelch level then during audio reception voice is breaking in between and it is not working properly but the same...
  10. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    Do you have any reference design or could you share more information?
  11. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    1) I'd implemented the circuit but couldn't get the required output. MPF103 and audio amplifier section not implemented as in my circuit i'm using LM4871 for amplification. I'd just monitored the voltage at 560K resistor and collector pin at Q1 but output remain same in both cases when signal...
  12. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    thanks vfone. Is there any way to control squelch by software?? Note: I'm using 16 bit micro controller so it doesn't have audio processing capability.
  13. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    Thank you for your response Can you please confirm capacitor value in schematic because some of the capacitor value is just mention like 005 and 002
  14. J

    Need circuit for mute the unwanted audio (Squelch control circuit)

    Hi, This is a basically audio without squelch control. I want to mute the speaker when there is no signal present. Is there any way to mute this audio?? Please share the schematic
  15. J

    copy code from ROM to RAM and execute

    Hi, I want to write data into internal flash where code is being executed. When i perform write operation on flash at that time i can not read or execute from flash so in this case i have to copy flash related code into RAM. using __attribute__(("section name")) command I'd successfully...
  16. J

    Antenna for RF module?

    I'd watch video for design VHF antenna. Need antenna dimension calculator for different frequency. https://www.youtube.com/watch?v=WiErTzoCyAA
  17. J

    Low pass filter for RF antenna?

    Thanks for you kind support Can I use SMD inductor instead of coil type?? My Transmit frequency is 150MHz and received frequency is 155MHz can you please help me to design low pass filter for this frequency.
  18. J

    Low pass filter for RF antenna?

    Basically I'm looking for filter for antenna for frequency (150 to 155 MHz). I'd google it and got some result but i don't know how to made such type of inductors. In image if you see there is a specification 2ov/@6mm what it is?? can I put standard inductor instead of coil type inductor...
  19. J

    Antenna for RF module?

    I would like to buy antenna for my walkie talkie my transmit frequency is 145MHz and Receive is 155MHz. From where i can buy the antenna and which type of antenna is good for long range?
  20. J

    Looking for long Range Wireless Audio transmitter and receiver

    Does DRA818U work for me? In many review i found that it will cover 3-5 Km line of sight?

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