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.
Just remove the 1uf capacitor between pins 1 and 8 of the LM386. It is C113 in the BITX40 SMD boards.
Is it that electrolytic cap beside the LM386 pth chip?
ReplyDeleteOn the SMD boards, it is a disc ceramic 1206 sized SMD capacitor. In the picture it has been taken out.
ReplyDeleteSmall audio amplifier
ReplyDeleteDiscrete homebrew.
https://ludens.cl/Electron/audioamps/AudioAmps.html
By the time you buy all the large caps for a 386 perhaps this amp should be considered.
Please , were is the arduino software for DDS ?
ReplyDeletehttps://github.com/afarhan/bitx40
Delete