21/12/2014 14:59
I am pretty hopeless with, what to me, is a very complicated 7854. It
has 7A26, 7A19, 7B85 and a 7B54 plug in array. I have a venerable old
Farnell power supply that has just killed some CMOS devices. I
suspected my circuit building skills for a while, then realised one
output of this series / parallel/ independent dual output PS was
spiking over the set 5V badly. I can see from the scope display it's
going to at least 10V when the power switch for the side in use is
turned on. The othwer side of the supply does not appear to spike at
all. What I do not know how to do, assuming it's possible, is to
get a trace displayed and held, showing just how bad and how fast this
spike is. Could anyone describe in simple and detailed terms how I
might acquire a trace? Thanks. I got the scope for a song with its own
PS issues which are fixed, but it's probably a lot more sophisticated
than I will ever need, in reality!
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Best Regards,
Chris Wilson.
mailto: chris@...
