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tyron123 said:is there a way to interface the DAC to the PIC .... kinda new to these kinda stuff ... i need a analog output from the PIC so i thought i'd use a DAC, but my problem is now about the data lines.. and other pins connectivity... ne ideas?
any help is appreaciated
Tyron
tyron123 said:is there any way to inc the current comming out of the op amp? i am currently getting .3mA and 2V from the op amp , the op amp(LM 741) is hooked up from the DAC(0832). the op amp is hooked up as a voltage follower, i need at least 4mA , between 4mA to 16ma actaully..
i treid hooking it to a transistor NPN2222A but i got the same current out.
tyron123 said:yes i tried it that way? but i only got 0.136 mA... so i had to try it into a voltage follower.. its kinda werid.. coz i was expecting more from the op-amp... the data that the dac is reciving is 1111 1111. so a full fledged thing... isnt there some sorta transistor resistor circuit that can boost of the current? or act like some sorta buffer?
tyron123 said:the current and voltage i measure using a multimeter.. and voltage is supplied externally by a DC +/- 15 v
i forgot to metnion that before..
Tyron
tyron123 said:ok.. im a lil fuzzy on this now.. how do i measure the current comming out of the opamp..
i am not puttin in any load.
tyron123 said:was the site down a few days ago... thats y it took me long ot reply..
ne ways i tried a coupla different methods to amp the current such as current amp for opamp and transistor as a buffer and now we are using a FET (no avail) .the external power supply that i am using provied +- 20 and upto 0.5ma
that is fed into the DAC and op amp.
Tyron
tyron123 said:if i change the external power supply to 6v i can get upto 2.5ma from it.. but i am guessing that would not be enough to drive the opamp and the DAC
thats was y i wanted some sorta current amplifier..
so umm.. what do u recommend i do? :?:
Tyron
:?