26-07-2020, 08:49 PM
I've bought a few of those too for parts. There about 3 other variations of old AM radio updated to Silicon. It seems like an old Germanium design slightly updated for Silicon. Can't be beat for value. The kit with the 70 kHz SMD superhet IC for FM and the modern version of MK484/ZN414 works well and the trick is to lightly tin PCB and tack the two corners, then simply press down and reflow several leads at a time. I meant to do an article a couple of years ago. My grandson built the FM/AM kit when he was about 10 with a little help.
The first time I got a Chinese schematic I used the Chinese of the resistor code colours to decipher which colour of ferrite on the can was the correct position, as the LO, IF and final IF are different.
The first time I got a Chinese schematic I used the Chinese of the resistor code colours to decipher which colour of ferrite on the can was the correct position, as the LO, IF and final IF are different.
