Re: Too hot 7805

["Bruce Plecan" <nacelp@bright.net>]

They are for sure 74LS161's.
The inputs are "grounded".
The 7805 is cool until I plug the 2732A in.
I had already let the smoke out of the Amp section of my DVM.
Hmm, might be time to get a new one.
Grumpy
 
| Do the digital chips have any floating inputs?  With a CMOS chip, the
| inputs can float at an intermediate level - causing the chip to consume
| _lots_ of current.
| Put an ammeter in series with the input of the 7805 and report how much
| current your circuit is drawing.
| > a 2732, and 2 74LC 161s, all the load is
| > a LED with a 1K inline resistor.
| LC?  Do you mean HC, LS, or something else?  It would be kind of hard to
| drive an LED with an HC device.  I seem to remember that you were asking
| if you could use a 74S device because 74LS was unavailable.  If you are
| indeed using 74S161's, they can draw lots of current.


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