Moderators: Dave Moll, Steve Anderson
Steve Anderson wrote:..I'll start a separate thread for the bench multi-meter...
Harry Dalek wrote:Oh that sounds like crap
Steve Anderson wrote:This 'simple' exercise of a DIY bench power supply is/has (and probably will) go/gone through a number of alterations/mutations and has almost come back full-circle. Read Rod Elliot's pages referred to above.
It will use the LM317/337 devices, but without those dreaded pots...they'll be replaced with rotary encoders that program the output voltages on the +ve and -ve variable outputs. It may seem this adds complexity but it may confer other advantages and flexibility....and in getting rid of those pots, improve reliability.
The other 'disadvantage' of the LM317/337 duo is the output as usually configured cannot go down to zero volts. The minimum is +1.25V and -1.25V respectively. However there is a way to get around this if you really want or need to. Myself, I'll probably not bother, how often do you need less than 1.25V of either polarity?
I'm still in the early stages of (re)design so no schematic to post as yet.
Updates as and when...
Steve A.
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