Q
quietguy
- Jan 1, 1970
- 0
Bit the bullet and bought myself one of those 0-30V 2.5 amp power
supplies from DSE. Nice unit, but two problems I didn't anticipate.
1. It has a power switch on the front panel - just on/off. Doesn't seem
safe to me, as switching it on with an unknown voltage setting while
connected to one of my TTL/PIC projects might result in tears if the adj
knob was jarred etc while the unit was in the off state - and it seems
silly that I have to either disconnect projects every time I switch the
PS off, or fit a 7805 etc on every board.
2. The voltage control is rather 'iffy' in that it is difficult to set
the output at (say) exactly 5.0v - a twitch and its 4.5, another twitch
and its 5.6 (get the drift) fiddle some more and get 4.9 or 5.2 etc
etc. I realise some variations may not be a problem, but I don't like
it. Life should be easy. V should be easy to adjust
So, I am thinking of
1. Fitting a load on/off switch - possibly by fitting a mains power
switch to the rear of the case, and using the current front panel on/off
sw as a load switch
2. If I can, changing the voltage adj. pot to a multiturn pot, assuming
I can find one that will fit in the original pots space - bit doubtful
there, but there is not really enough room on the front panel to fit
another (fine control) pot.
Any comments? Ideas? Anyone else done these (or other) mods?
David - who knows the mods will nullify the guarantee, but these PS's
should be easy to fix, so...
supplies from DSE. Nice unit, but two problems I didn't anticipate.
1. It has a power switch on the front panel - just on/off. Doesn't seem
safe to me, as switching it on with an unknown voltage setting while
connected to one of my TTL/PIC projects might result in tears if the adj
knob was jarred etc while the unit was in the off state - and it seems
silly that I have to either disconnect projects every time I switch the
PS off, or fit a 7805 etc on every board.
2. The voltage control is rather 'iffy' in that it is difficult to set
the output at (say) exactly 5.0v - a twitch and its 4.5, another twitch
and its 5.6 (get the drift) fiddle some more and get 4.9 or 5.2 etc
etc. I realise some variations may not be a problem, but I don't like
it. Life should be easy. V should be easy to adjust
So, I am thinking of
1. Fitting a load on/off switch - possibly by fitting a mains power
switch to the rear of the case, and using the current front panel on/off
sw as a load switch
2. If I can, changing the voltage adj. pot to a multiturn pot, assuming
I can find one that will fit in the original pots space - bit doubtful
there, but there is not really enough room on the front panel to fit
another (fine control) pot.
Any comments? Ideas? Anyone else done these (or other) mods?
David - who knows the mods will nullify the guarantee, but these PS's
should be easy to fix, so...