[Tech] Voltage inversion

[guddler]

[ukvac] [Tech] Voltage inversion
Okay, then - the Gauntlet issue is sorted for now, but the response I
got from that one has led me right down another train of thought on
another topic.

For one of my boards I don't actually NEED -12v as I've heard it working
okay with -5, but I was going to invert the sync properly using a bit of
vero board, so I got to thinking about inverting the +12v too in order
to provide voltages as they were really meant to be.

Now obviously I would check output voltages before I connected this up
to the board, but do any of you tech heads out there know if could
achieve the inversion simply by using an ICL7660S voltage inverter, with
a pump capacitor of 10uF and a corresponding 10uF reservoir cap, or
would I need to worry about a resister in the output section?? (confused
- me too!)

Jeez, it's starting to sound like I know what I'm talking about ;o)

For anyone who's interested, I'm talking about the diagram in fig. 14a/b
of this URL:

http://www.maplin.co.uk/PDF/ICL7660S.pdf

Ta again,
Guddler.
PS: REALLY ought to get on with some work!

---------------------------------------------------
Martin White

http://www.guddler.com



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[d-type]

[ukvac] Re: [Tech] Voltage inversion
The 7660 is offten used to provide a voltage inversion.

But, note that a 7660 (I think there's a 7661 as well) does not give
much of a current capacity - it's really only suitable for providing
a very low current signal for small inverting op-amps etc. It's
probably not much use for a speaker amplifier, which is what most
PCBs would use it for.

Check the output currect capacity of a PC PSU and then compare it
with a 7660. There'll be a BIG difference!

D-Type