------=_Part_84_21059496.1136078377711 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I did not caught the moment when the thread jumped off-list. So I'm reposting it now. ----------------------------------------------------------------------- Brooke Clarke wrote: > If the 0.2 volt range is expanded to 0 to 5 volts then the amplification > is 5 / .2 =3D 25 (fairly low). > Using an external 12 or 14 bit A/D adds cost and complication. For more > money a MR sensor would work much better, but the idea is to see of a > very low cost Hall sensor will work. Brooke, let's take PIC16F676 worth one dollar or so. If after pre-amplifying your signal 25 times from m volts to, say, 100 mV, you think the signal is still weak for PIC16F676 A/D, you can add a 4-bit R2R ladder to the another input resistors of your Op Amp to adjust the Op Amp's offset, thus allowing bigger amplification. The 4-bit R2R ladder is to be controlled by PIC16F676. This way you can narrow you input range up to 16 times, making possible not 25, but 250 amplification. So your useful signal will be up to 1v. Not that weak signal for 10 bit A/D with 2v reference level. Don't use noisy PWM when measuring mVolts Regards, Mike ----------------------------------------------------------------------- Hi Mike: I've just been surfing Microchip App Note 655 and the R2R ladder looks like a very nice solution. Thanks very much, Brooke ----------------------------------------------------------------------- HI again Mike: I've been trying to figure out the circuit and think I'm back to the original question. For example an R2R ladder driven from the PIC provides a zero to five volt ramp with 5v/(2^n) where n is the number of bits. I can dedicate 5 I/O pins to the ladder so get 0.156 volt steps out of the D/A converter. So the problem is the same as with PWM, that's to say how to get the 0->5 volt range compressed into a 2.4 to 2.6 volt range? Happy New Year, ----------------------------------------------------------------------- Brooke Clarke wrote: > I've been trying to figure out the circuit and think I'm back to the > original question. > For example an R2R ladder driven from the PIC provides a zero to five vol= t > ramp with 5v/(2^n) where n is the number of bits. > I can dedicate 5 I/O pins to the ladder so get 0.156 volt steps out of th= e > D/A converter. So the problem is the same as with PWM, that's to say how= to > get the 0->5 volt range compressed into a 2.4 to 2.6 volt range? One input of the Op Amp - to the device's output. The second input of Op Amp - to the central point of the voltage divider (2.5V). The bottom resistor of the divider is compound -some resistor and R2R ladder in series (the ladder - on the bottom). Regards, Mike ----------------------------------------------------------------------- Hi Mike: I can't visualize the circuit. Could you send it as a hand drawn schematic (jpg, bmp, tif, etc)? Thanks, Brooke ----------------------------------------------------------------------- Brooke Clarke wrote: > I can't visualize the circuit. I can hardly too now. > Could you send it as a hand drawn schematic > (jpg, bmp, tif, etc)? Yes, definitely with my Epson Perfection 2480 (heck with CADs), after I sobber up a bit tomorrow :-) It's 2:10 am now here. Happy New Year, Mike. ----------------------------------------------------------------------- Tomorrow has come. 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