From: "Frank Bemelman"
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Subject: Re: How to get CMOS counter to drive a relay?
Date: Tue, 22 Oct 2002 20:33:10 +0200
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Organization: EuroNet Internet
NNTP-Posting-Date: 22 Oct 2002 18:33:15 GMT
"Dave VanHorn" schreef in bericht
> I'm curious what you're building with this.
> I used to make power cyclers for our equipment in burn-in, that used a
> of 4060s, through a multi-in or gate and dipswitch, so that I could get
> or less random length on and off times, at variable speeds. They killed a
> lot of terminals, but them that survived were golden :)
I not building anything with this. The OP wanted to drive a relay with
a 4060, and several solutions were presented. The last solution was
a fet + diode for the relay, the usual advice. I could not resist,
and asked if we really needed that fet; knowing that the 4060 (or any
other 4000 cmos) would probably be able to drive that 25ma directly,
with some voltagedrop of course.
The next step was cutting away the diode, and I have to admit I was
surprised to see that even this does not cause trouble. Then I turned
up the supply to 25V, and pff said the 4060. As I said earlier, I would
never consider this for a real design, I have enough problems as it
is. Yet it's funny to do this silly experiments.
Now I got the relay between output and gnd. This works even better,
the 4060 continious to work up to 28,5V and does not get fried at
If I were on a bounty island, and a 4060 and a relay were the
only available parts, I'd hook them up right away, and spend
the rest of day on the beach ;)
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