1 Jun
2007
1 Jun
'07
3:55 a.m.
On Thu, 2007-05-31 at 09:00 -0700, Chris M wrote:
uhh, I dunno. You stare at it and gleen what you can
from that (problem if you have multiple layer boards).
Then use an ohm meter to ferret out the rest? I think
I've heard something to the effect that *some* chips
could be damaged that way though. But I suppose if
you're well acquainted with electonic stuff, you'd
know when and where to apply that. Like I said, I dunno.
Pretty much. Sometimes (like when I was sorting out the analogue end of
my Ensoniq Mirage) I'll remove a couple of chips to figure out what the
tracks underneath are doing. If there are a group of similar chips you
can often figure out what a bunch of them are doing just by looking at
one. For instance, in the Mirage there are a few 4051 multiplexers, and
some TL084 op-amps, and some capacitors with one end connected to
ground. These form the sample-and-holds for the VCF cutoff and
resonance control voltages. Once you've got one, the rest are obvious.
Gordon
--- Gordon JC Pearce <gordon at gjcp.net>
wrote:
Yup, but if that's the case you can generally work out roughly what it's
meant to be, particularly if others around it have survived.
If you've got a total unknown then you can probably figure it out once
you've got the rest of the circuit figured out.
Well, the value and voltage rating is stamped on
them...
Not if the cap is extra toasty. You still haven't told us how you work up a
schematic
either. I'm losing my patience.
Have a guess. Go on, just have a guess. It's
simple really.