High Side Pulse Transmitter

Actually, we buy parts, stick them on boards, and sell the result. The customer pays for specs and performance, so I want to get the maximum performance from the mininum number and price of the parts, taking into account the cost of placement, pcb real estate, and test costs, too. We run about 22% parts cost overall, but have relatively high (actually, very high!) labor costs.

One good thing about simple circuits is that they're easier to build and test, so sometimes it makes sense to spend a little more for parts if it simplifies the product.

John

LOL- that's all adding up too. For a minute there, I thought you were thinking about that Maxim isolated RS-232 drive with 50V withstanding voltage, but their drive power is so weak, they're unusable.

snipped-for-privacy@ncon.com wrote: > I DID see other circuits in the thread, but I did not have time to > look and play with them. I had to ship the project last Friday and > did not have time to play around. But I assure you I will eventually > examine all replies for their technical merits.

LOL- that's a good one...*you* will examine?..too funny. And you didn't ship anything, those circuits of yours would burn up on the first bit at

1200 baud. You know, the ones that cost you 50 Watt per bit to send- too much and too funny.

Oh yeah- and reading comprehension is something else absent from your tool suite..

I read in sci.electronics.design that John Larkin wrote (in ) about 'High Side Pulse Transmitter', on Tue, 11 Oct 2005:

Are you selling parts or buying, though?

--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

Right. Drains to the output.

Pretty obviously you don't want a sustained high on the input. If that's a concern, you can use a common-base transistor to dc couple things...

which is actually nicer, but a bit slower. Still 6 parts including the [Rsc] thingie.

John

Are you describing this? View in a fixed-width font such as Courier.

. V+ . | . +------+ . | | . z | . a | . + | ||- . +---||----+---||>

. | | ||- . | [Rb] | . | | [Rsc] . | | | . | --- +------>

. | /// | . | ||- . CMOS IN>----+-------------||< . ||- . | . | . | . --- . /// . . .

Was it? That's silly. Why would anybody want to do that?

That would take 5 parts, too.

John

Ain't it obvious?

John

There's not a whole lot of ways to arrange 5 parts.

John

[snip]

Come on John, show us, or we'll conclude you're BS-ing ;-)

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
I love to cook with wine.      Sometimes I even put it in the food.

Are you and Fred telling me you can't figure out how do this with 5 parts? How disappointing.

John

I haven't been following. Is this a circuit for making a +12V / -5V, 0.25A-capable gate-drive pulse from a wimpy TTL logic signal? I can see doing it crudely with six parts, but five ... ???

--
 Thanks,
    - Win

No, that's something else. It's described in the original post. Logic in, output swings from V+ to V+ minus 6 volts, where V+ is pretty big.

I didn't read the op's specs carefully, so my first suggestion swung V+ to ground (Fred trapped me on that one) but the limited-swing version can still be done with 5 discretes, 6 if you include current limiting.

John

But the requirement was to clamp the low going output at 6V down from Vcc which was in the range 24-48 volts.

Well- where do you put them?

Stop screwing around and describe the circuit- unless it's proprietary or something...you could be talking about any number of circuits.

I see, 24 to 50V.

Yes, five.

Yes, assuming V+ current limiting only, and all loads to the most negative output voltage. Crude, but workable.

--
 Thanks,
    - Win

I prefer the term "elegant" to "crude."

John

I placed a collection of circuits and spice simulation outputs (a couple belonging to Fred Boggs) in a thread of the same name in the news group:

alt.binaries.schematics.electronics

Thank you all for your suggestions.

Jeff Stout