mstechca
New Member
Look at the schematic. This is my FM radio. The values that are highlighted have been modified. Sometimes, I can barely pick up radio announcers at 108Mhz Sometimes I change the highlighted diodes to resistors. When I touch these resistors, I get an AM station in loudly. The values I used for the resistors in yellow boxes were in between 50 ohms and 500 ohms. I rarely used 1k as it provided the poorest results. The diodes highlighted in teal were used because I wanted to force a one-way operation and I wanted to pass as much of the signal as possible. I got similar results replacing these diodes with resistors. The resistor in purple had the biggest impact. It seemed that the lower the value, the more clear and quiet the station is.
What I want to know is what values should I use for the highlighted components, and do I need a resistor in the red area? if so, what value?
I also want to know why you chose these values? I want some math!
I want to be able to pick up ANY station clearly.
Note that changing the value of the components in green did not make things better.
What I want to know is what values should I use for the highlighted components, and do I need a resistor in the red area? if so, what value?
I also want to know why you chose these values? I want some math!
I want to be able to pick up ANY station clearly.
Note that changing the value of the components in green did not make things better.