Audio Mute Circuit For Bitx

Bitx had a problem of  noise being generated on pressing the PTT button. The usual way of muting the PIN 3 of LM386 did work  to solve the problem much, although to some extend, while working with Bitx3b i had discussion regarding this problem with Om Blake Bartosh from USA who was also building the Bitx Version3b  and who has also put in a great effort in bringing out the new Bitx3b construction manual.

The idea was to make a project to mute the audio of LM386 completely.
Presented below is a schematic of the audio mute circuit designed and tested by OM Blake Bartosh.

I myself build it and its working perfectly with my bitx3b. This circuit can be used for any tcvr.
The complete assembled kit will be available very soon.


                                           SCHEMATIC OF BITX AUDIO MUTE CIRCUIT                          

                                           VIDEO OF BITX AUDIO MUTE CIRCUIT                          

 

New Ham Radio TCVR Minima

Om Farhan from India has come up with another Ham Radio project. The new project is named Minima, which means a project with minimum components.

Minima is a complete ssb/cw tcvr with Arduino in it and an Si570.

Farhan's home page on minima is found here  http://www.phonestack.com/farhan/minima.html

 To carry on with our services we have decided to help amateurs buy our various products based on  Minima.

We are starting by selling the PCB developed by our forum member as very low cost, as to promote the building of Minima. Very soon we will provide a complete kit with case for Minima .

Please look out the availability  of the PCB set for Minima, which will be available very soon on our new blog meant for Minima.  http://cqminima.blogspot.com


We have also set up a new blog for  bitx version 3 B, which will be updated with all info on Bitx3B
http://bitxversion3b.blogspot.in/

Best of 73s

Sunil VU3SUA

Posted here are some pictures of my second built Bitx3B this one is with agc working. The earlier agc pcb had to be modified. The present agc/s.meter pcb mounts on the vu meter.

Bitx Ver 3 B RX demo

Some more new videos of Bitx Ver 3 B in receive mode.

Bitx Version 3 B Demo 3

Bitx Version 3 B Demo 2