Рет қаралды 43
So this is a view of the filter showcased in the immediately previous video as it was built. I originally pre-built it on breadboard and had not-great-but-certainly-worth-exploring results, so I decided to burn it onto a perfboard and see if I got better results.
I did. Though again not phenomenal, it's still a net improvement.
I believe the poor performance in the FM broadcast band rejection is due to stray capacitance (and I possibly damaged my capacitors soldering them to a perfboard in a previous build, desoldering them from that build, resoldering them here incorrectly, desoldering them again, and then finally resoldering them in the correct arrangement). So, I plan first to remove the stray capacitance by removing unused solder pads from the perfboard, and then I may replace the existing, potentially damaged capacitors with known-good ones.
AM Broadcast Band High-Pass Filter is on page six of the following PDF:
www.dxing.com/...
FM Broadcast Band Reject Filter is at the following link:
www.sv1afn.com...
Schematic of that filter here:
nebula.wsimg.c...