mstechca
New Member
After all the nice answers regarding my DAC, I think I'll stick with a few hundred Kiloohm resistors at the outputs.
Now here is the interesting part. I made myself a transmitter that makes one tick a second. I turned on my receiver (with the DAC circuit in it), and I am actually picking up the signal on one station (or binary state). Not bad, considering NO ONE TAUGHT ME IN SCHOOL (sorry, but I had to yell that out.)
It seems that now I might have to increase the number of bits in the DAC just to accompany for the stations that fall in between one binary state, and the next.
I'm wanting to cram my entire radio into a 5cm by 3.5cm space and I can do it with a 4-bit DAC. If I do an 8-bit DAC, then the IC could present me with problems.
If I were to avoid any trim capacitors, what is the minimum number of bits most radios use in their DAC's when selecting stations?
I don't want to use too many bits, because it will take longer for a scan,and it will take more board space. I don't want to use too few bits because it will skip too many stations inbetween.
oh, and by the way, I determined that the 2N3904 transistor makes the BEST varicap diode for me.
Now here is the interesting part. I made myself a transmitter that makes one tick a second. I turned on my receiver (with the DAC circuit in it), and I am actually picking up the signal on one station (or binary state). Not bad, considering NO ONE TAUGHT ME IN SCHOOL (sorry, but I had to yell that out.)
It seems that now I might have to increase the number of bits in the DAC just to accompany for the stations that fall in between one binary state, and the next.
I'm wanting to cram my entire radio into a 5cm by 3.5cm space and I can do it with a 4-bit DAC. If I do an 8-bit DAC, then the IC could present me with problems.
If I were to avoid any trim capacitors, what is the minimum number of bits most radios use in their DAC's when selecting stations?
I don't want to use too many bits, because it will take longer for a scan,and it will take more board space. I don't want to use too few bits because it will skip too many stations inbetween.
oh, and by the way, I determined that the 2N3904 transistor makes the BEST varicap diode for me.