So I bought one of the original $47 Bitx40's but I have been working away from home and fisrt wire do it up yesterday. I did order an ioLabs VFO for it and then got a raduino for it but have touch¨¦ neither. My first thought is to put in NPO caps and see if I can make the analog VFO stable enough to use as is. First mod is a polarity protection fuse and diode (been there).
So, I?have a couple of questions. I hooked it up and powered it on it ha dummy load and was surprised by the amount of noise a single I turned up the volume with no antenna. (#1)Where is this noise coming from?
Is it the LM386? Or some place else? Can the LM386 be replace with a TDA2822 And would that make a significant difference?
Second question: on earth of the first mods was to replace some of the resitors to reduce current and heat. Mine came with the extra resistors. So, (#2)is there any down side to doing this replacement?
Tnx & 73/72
Jer aa1of
