Friday, November 11, 2016

Improving the audio

The BITX transceivers have more receiver gain than needed. Backing it off a little makes the audio sweeter. Here is the mod:

Just remove the 1uf capacitor between pins 1 and 8 of the LM386. It is C113 in the BITX40 SMD boards. 


  1. Is it that electrolytic cap beside the LM386 pth chip?

  2. On the SMD boards, it is a disc ceramic 1206 sized SMD capacitor. In the picture it has been taken out.

  3. Small audio amplifier

    Discrete homebrew.

    By the time you buy all the large caps for a 386 perhaps this amp should be considered.

  4. Please , were is the arduino software for DDS ?