Re: Is there a dual equivalent to the quad LP324?


Joerg wrote:
Hello Klaus,


... I just wish someone would write a book on these special uses
of CMOS ICs and other special uses of other devices (like using the LED
for a simple current source to cancel out most of the thermal drift
(recent discussion on SED))


Too little market for it. Many kids coming off universities these days
can't design analog anymore. Some can't even solder. All they did was
calculate and simulate.


My problem is though convincing my colleagues that this is ok for large
scale production. If they cannot read a spec for it in the data*** it
is not allowed. That obviously kind-off makes sense since
characterization of a device cannot provide a guarentee that the
manufactor won't change a process (upholding the spec'ed data) that
will significantly change the characterization/measured data.


Your colleagues are right. Check Philips, they have about the best and
most detailed family specs for CMOS logic I can think of. But be
patient, their web site is horrible IMHO. Not so bad from Europe though
because of less latency.


(in my last project I made a low-power SMPS from LM139 and CD4093 and
discretes (great savings there). My two most favorite parts :-)


I only afforded my leanest switcher two sections of a hex Schmitt
trigger (needed the other four elsewhere) but no LM139. Cost even less
than a TL494 plus mine can go to 90% duty cycle (the TL can't). It has
current mode control, power sense, voltage cap and current ramping. And
it turns itself off when there is no load and back on when there is one,
to conserve battery juice.


Very nice indeed - looking forward to your first book release *G*

Cheers

Klaus

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