But seriously, they have all gone
to PICs ... or their equivalent. For
example, the MK151 clock kit sold
by Ramsey and others uses a
programmed PIC16C54C-04 micro-controller as its sole IC. So let me put
up a challenge to our readers. Come
up with a working PIC, Atmel, or
Motorola microcontroller and I will
see that it is made available to our
readers — with compensation for your
time, of course. For further details con-
tact me at TJBYERS@aol.com. Thanks!
QI am looking for an Intersil
ICM7260 Programmable 59
Timer/Counter. This is an
older chip and I have tried
several suppliers without luck. So I
thought you may have a source.
AIntersil has been acquired
by Maxim, and short of
a bulk purchase from an
jobber, the only place to buy this chip
is from www.maxim-ic.com/parts.
cfm/p/ICM7260. It appears this chip
will be in production for the short
term. But more and more, microcontrollers are taking over these chores.
So be leery when using older ICs in
a new design without first checking
with the manufacturer to see how
long they expect to make and support
For example, as of this writing,
Microsoft has pulled the plug on
Windows 98 — a stable operating
system used by many hobbyists. That
means no more updates, no more bug
fixes, and no more answers when things
go wrong. The same applies to ICs that
have run their course.
■ FIGURE 8
5 1 7 Clicks
10 5 Clicks
4 3 Clicks
CLICK IS ONE,
CLICK-CLICK IS TWO ...
QAt night, pilots can control
runway lights at small
airports by clicking their
radio microphone. Seven
clicks within five seconds turns on the
bright lights. Five clicks is medium and
three clicks is low. After 15 minutes,
the lights turn off — an obvious way to
save electricity. Well, I’m looking
for a circuit that will let me control
operations via the number of received
clicks within five seconds. Ideally,
the circuit would have a timer that
once activated would shut off after a
Petals Around The Rose: They say
the smarter you, the longer it
takes to solve the puzzle. Rumor
has it Bill Gates took one full
week to solve it. Stupid me
solved it in four moves.
Urban legends: fact or fiction?