hello,there.I want to make a 0 to 12V variable dc power supply using lm 723.since Vref has to be more than 2V(for diff amps in 723 to work)my o/p is in the range 2 to over 14V. The problem i am having is in finding a virtual ground of around 2V.I put a 741op amp and used it as a unity follower with Vref of around 2V as i/p and +Vcc connected to unreguated supply and -Vcc to ground.Can i use op amp wid -Vcc as grnd this?
With this cofiguration the maximum Short ckt current is arnd 32mA whereas i need it to be arnd 100mA.Also when i short 723 ic's o/p to o/p of 741 the op amp is not working as unity follower.Its o/p and thus -ve i/p goes to the value of o/p of 723 and not of Vref.
how can i increase the current value..even pass transistor isnt helping
Please help .I need to make the circuit urgently.thanks in advance
With this cofiguration the maximum Short ckt current is arnd 32mA whereas i need it to be arnd 100mA.Also when i short 723 ic's o/p to o/p of 741 the op amp is not working as unity follower.Its o/p and thus -ve i/p goes to the value of o/p of 723 and not of Vref.
how can i increase the current value..even pass transistor isnt helping
Please help .I need to make the circuit urgently.thanks in advance