Electronics Forum / Design / March 2009

We had a power glitch yesterday, and all of the computers shut down. So,
everybody had to reboot, and the hub in the front office needed to be
reset.
The boss asked, "Don't we have one of those surge things?" I said, yeah,

I'm looking for a design for a 120VDC 60mA constant current
supply.  This is what's needed to drive old 60mA Teletype machines.
The classic solution is to run a constant voltage supply through a
2K 10W resistor, but that approach dissipates 8W when idle, which

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So, besides some other things the Tektronix 7704A had croaked. T'was the
switcher. No schematics available, the usual. Looks like someone really
"jammed it together" which is strange since this unit has always had
top-notch service at calibration places. Anyhow, got it fixed now ...

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I need to generate the accurate waveform from TTL input. The swing
should be ~20Vpp, slew rate > 1kV/us, load current ~5mA, top and bottom
tied to the reference voltage. The switch like that can certainly be
done with few discrete components, however I wonder if there is a single ...

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John

Once again, a scavenger hunt is at the top of the list.  As an employee,
some decisions are handed to me.
In times long past, I have seen relays whose coil was wound with fewer
turns and heavier wire.  The coil, wired in series with a load, pulls the

i think when a dc-dc convert works at discontinue mode , the switch
state is on-> off -> another off  ->on ->off .....
but i use the ltspice it tell me lt1316's worke state is on->off->on-

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I am trying to learn a bit about wavelets, but never studied
the subject academically.
A semester length textbook would be overload.  I am looking
for maybe a chapter of a book, or a tutorial paper in one of the

plse send me a circuit of a op amp used in a end of line resistor in a alarm
system
Thks
Rob