it is fed 8.4v and should output 6.5v. instead its outputting 0.2v. when i first soldered it in, i had the two voltage set resistors flipped. could this have fried it?
The circuit looks OK.
With the resistors swapped I would expect an output of 200mV (no frying).
Check the values of R11 and R12 and make sure that R12 is connected (with it disconnected I would again expect 200mV output).
thank you. its working now (the solution was simple - the resistors where right the first time but the power supply was not), 0402 resistors are hard to deal with.
however, the negative voltage (sercond "regulator") is outputting -6.164v. this is the supply for a differential op amp circuit. it simulates at -6.5v, any reason why the actual value is so much lower? i figure for op amps the +- supply should be as close as possible to matching. thanks
my bad - the schematic is wrong. the actual value is 237R. so it should be -6.472V. my bad for mislabled schematic, the part number is for 237 so thats whats installed. 0.1% resistors.
nothing but whats shown in the above schematic - im soldering on and debugging as i go. i thought that the output filtering would meet the minimum current draw, am i wrong?
C15(?) and C35 need to be low ESR and connected by short leads to the chip otherwise it will reduce the regulated voltage. Is this constructed on a PCB?
On the negative regulator's output, the tantalums (C35, C36) are backwards. Since it is a negative rail, the positive of the caps goes to ground. I'd toss those and put new ones in.
/mike
On the negative regulator's output, the tantalums (C35, C36) are backwards. Since it is a negative rail, the positive of the caps goes to ground. I'd toss those and put new ones in.
/mike