C20 Wouldn't get reverse polarized now and LM741's output could swing from -3 to -1 v.
I corrected some mistakes , now i can't find anymore , Please let me know if you see one.
http://www.8052.com/users/far...pdated.GIF

I am planing to provide the supply by the LM7805,LM7905. Analog section which will include the ADC will sit on a different PCB than the Digital Interface.

- Would it be better if i move the ADC to Digital PCB ?

- Would it be better to provide different regulators for the Analog and Digital supply (like the Bitscope) ?

- LM7805 provides 3 mV ripple rejection , Is this ripple acceptable or do I have to go for a better regulator ?

- Could I Use BL02RN02 ferrite beads instead of the 4.7R resistors which are serried with the Op-Amp supplies (If yes, Do I have to use a serried resistor also ,considering that I'll use a .22u Tantalum for decoupling) ?

- Trigger Circuit of Bitscope uses 74AC86 , this chip provides exactly Vil,Vih=Vcc/2 at it's inputs where HC provides Vih=3.15,Vil=1.35 (Vcc=4.5V). Could I solve this problem by chaing the 2 resistor's at the input circuit ?
Woudln't it be better to use a fast Op-Amp like LM319 to pick up the trigger signal and have the ability to move up/down the trigger point ?


Thanks in Advance
Farshid