Follow Up
Ronv,
Upon returning to my house, after Softball Practice, I did some more experimenting with your latest circuit.
I changed R100 to be 500 ohms, as this appears to be the maximum resistance that effects the 2N3904 setup. Any larger value does not appear to have any effect on the Voltage and/or Amperage output.
My findings are as follows:
The Left Side of the Bridge has a range of 18.5V @ 13.0ma & 9.09ma near R3. (A drop of nearly 4ma.) The minimum values are 3.57V @ 1.78ma & 1.67ma near R3.
The Right Side of the Bridge has a range of 17.4V @ 13.1ma & 8.54ma near R3 (A drop of 4+ma.) The minimum values are 3.45V @ 1.80ma & 1.60ma near R3.
I am still not sure why two sides are different in the simulation and I am also not sure why it does not do down to 1ma near R3.
Things are looking very close, but I have reach a wall with my ability to stay a wake at this time. (To many "up all nights" over the past week or so...) I am going to stop for now and pick it back up in the morning.
Thanks again for all of your time and efforts.
Regards, BHinote
Ronv,
Upon returning to my house, after Softball Practice, I did some more experimenting with your latest circuit.
I changed R100 to be 500 ohms, as this appears to be the maximum resistance that effects the 2N3904 setup. Any larger value does not appear to have any effect on the Voltage and/or Amperage output.
My findings are as follows:
The Left Side of the Bridge has a range of 18.5V @ 13.0ma & 9.09ma near R3. (A drop of nearly 4ma.) The minimum values are 3.57V @ 1.78ma & 1.67ma near R3.
The Right Side of the Bridge has a range of 17.4V @ 13.1ma & 8.54ma near R3 (A drop of 4+ma.) The minimum values are 3.45V @ 1.80ma & 1.60ma near R3.
I am still not sure why two sides are different in the simulation and I am also not sure why it does not do down to 1ma near R3.
Things are looking very close, but I have reach a wall with my ability to stay a wake at this time. (To many "up all nights" over the past week or so...) I am going to stop for now and pick it back up in the morning.
Thanks again for all of your time and efforts.
Regards, BHinote
OK, Attached is the modifies simulation. Here is what I did.
I changed C4 to 1 Ufd. I think it may have been 4.7 F. I also took out the pot and replaced it with a 10K resistor. Both just to speed up the simulation. I then let Multisim debug the time steps and other stuff I have no idea about but it made it happy.
You can't read the DC values (in the little yellow boxes) now because it is pulsing, but if you just want to see the values remove U6 pin 6 from ground and wire it to the output of the 7805. Then it won't be switching all the time. Then the yellow boxes give the DC values.