1. Khisraw

    Using Python API want to connect Raspberry Pi4 to a Bluetooth headphone

    Hi, We are using Raspberry Pi4 with Zero Pi Codec. We are getting audio from a stereo mic and want to transmit this audio to Bluetooth headphones. The program works fine until we want to connect it to Bluetooth. It connects for 5 seconds but it disconnects. We are using the code in Python and...
  2. MrNams

    Can we make onboard antenna external?

    Hello, Sorry 1) if this is wrong place 2) Dumb question. I am working on smart irrigation project, I have Arduino connected with 4 sensors and 1 actuator, Arduino collect data and send to ESP32 using Reyax RYLR896 Lora Module connected to it. I keep all PCBs in one waterproof box, but this...
  3. M

    Lav mic issue

    I recently bought the Saramonic Uwmic9s and I am having trouble setting it up I've went through all the settings on the transmitter, receiver and camera but there is still a hiss in the background. Im fairly new to this and am not sure if there is something I've missed, or if its the fact that...
  4. BuyingOffDeath

    Unexplainable RF Power levels

    I have an RF Explorer to use to scan what RF's are around me. I am curious as I'm am just getting in learning about wireless transmission and propagation. However I can't explain these power levels of -10 dbm all the way to -0. The RF Explorer does seem to be working correctly just based off of...
  5. G

    Please verify AM tube radio transmitter!

    I've built an AM tube transmitter. I don't have much experience in electronics. Can you please verify this circuit and tell me if it would work or how can I improve its performance? It uses an Armstrong oscillator to make the carrier frequency.
  6. M

    Wireless power transfer device with data link

    Hi all, I have implemented a WPT system with communication in both ways using ASK. When I connected communication part on RX side the same way as on TX, there just was not enough amplitude change to be detectable on TX side. So I made communication part using two mosfet and capacitor. That was...
  7. A

    Antenna Radiation Patterns Explained

    Hi, Been struggling to find information that I find to be obviously missing on how to interpret antenna radiation patterns. For example have a look in the datasheet for my chip antenna. I can understand the three 2D radiation pattern graphs, one for each plane, what I don't understand is what...
  8. J

    Understanding Networking Protocol.

    Hi , I'm using cc1350 hardware amd transmit packets with mode 1 (legacy mode) that on the receiver side over mode 1 (legacy mode) I get wrong decryption of the received packet. over DSSS=8 I must get and see the patterns 11001100 or 00110011 according to TI handbook's table found above the...
  9. I

    T.I. BLE USB MCU Programming Trouble (CC2540)

    Hello Everybody! I am trying to program/communicate with the CC2450 BLE IC, which is a transceiver/microcontroller. My computer is having trouble recognizing the device. It does not show up in Device Manager. I've tried the T.I. tools for trying to communicate with it. I've downloaded the BLE...
  10. A

    Modding wireless RF headphones to Bluetooth headphones

    Hi guys, I have been using a pair of Sennheiser headphones for quite some time now (HDR 118). They offer good sound and sit comfortably, however they do work based on RF signals (863 - 865 MHz) and have been catching a lot of interference as of late. Instead of just getting a new pair of...
  11. OriyaEliav

    Magnetic Resonant Wireless kit

    Hello I'm looking for a Magnetic Resonant Wireless Evaluation kit ( with Transmitter and Receiver boards or chips) I can't find it on the Internet and I want to buy it. The distance between the Transmitter to the Receiver has to be at least 5 cm. Best regards, Oriya
  12. M

    Wireless RF Relay Project: 12 Fish Feeders, Low DC Voltage Circuits

    Hi Everyone, Project Goal: Feed my fish! Tidy up and get rid of conduit and wires running eveywhere! Current Setup: I have 12 Fish Feeders powered by a DC motor, and I run all the wires run along the walls in conduit back to the controller. Each color represents one fish tank. ("1-4" feeder...
  13. P

    How to implement my control system on my dsPIC33EV 5V CAN -LIN Starter kit (dsPIC33EV256GM106)

    Hello everyone, So I have been working on a wireless charger for EV applications. The prototype I designed uses a control system to manage the voltage at the exit of the charger. Without going too deep, we can just assume the charger is a source supplying a square signal of 15 Volts of 150kHz...
  14. A

    Feedback on 2.4GHz Circuit

    Hi, So this is a project that's on its second iteration, having trusted the previous PCB designer and ending up with some expensive PCB-shaped coasters, have learned quite a bit myself and also asked for help from another more experienced engineer. Looking for some feedback on this RF feedline...
  15. spockshr

    Antenna Tuning for non 50 Ohm Match

    I've designed a matching network for a PCB Loop Antenna and I've tried to match it to a source of 465 Ohm impedance with 1pF parasitic capacitance i.e. Source Impedance = (166 -j223) Ohm Ideal Load Impedance = (166 + j223) Ohm. I've used Tapped Capacitor Matching network as suggested in this...
  16. W

    Cat tracking collar

    Hi, I'm trying to build a radio beacon that would be mounted on a cat collar. The goal is to get the distance of the cat - every 10 seconds. - for ≈ a month - with a ≈ 30 metters range detection - through walls - can fit on a cat collar (battery + electrical components) Would it be possible...
  17. W

    proximity sensor 2 meters

    Hi, can anyone help me with ideas on building devices that produce an audible signal when come close to each other, say 2 meters or less. Both devices continue signalling until they are two or more meters apart. Think about a microphone moved close to a speaker - you hear an unpleasant...
  18. A

    Use a pressure switch to activate a light wirelessly o ask if anyone can

    I have limited electrical knowledge so would like to ask if anyone can recommend a solution to a system I would like to have installed. I can have an electrician install it but as it is my concept I would like to identify the best way to configure it. We use HP air for testing at work and as a...