I have observed that it is always suggested that the secondary VAC of the transformer should be VDC/1.414 for a bridge rectifier with a capacitor filter. i.e an 18-0-18 for ±25VDC .
Now isn't the case only at no-load condition ? which is not quite what happens most of the time(no-load). There will always be a load - even minimal - like the chips drawing idle current. So the chips would really be operating at about ±18-20VDC - depending on whether the transformer is at full load or not and ofcourse the % regulation of the transformer. Am I thinking this right ? If so then why arn't people using something like 24-0-24 to get ±25VDC ?
Thanks for clearing this up for me.
Now isn't the case only at no-load condition ? which is not quite what happens most of the time(no-load). There will always be a load - even minimal - like the chips drawing idle current. So the chips would really be operating at about ±18-20VDC - depending on whether the transformer is at full load or not and ofcourse the % regulation of the transformer. Am I thinking this right ? If so then why arn't people using something like 24-0-24 to get ±25VDC ?
Thanks for clearing this up for me.