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From: John Larkin on 4 Jul 2010 10:53
On Sun, 4 Jul 2010 00:36:50 -0500, "Tim Williams"
<tmoranwms(a)charter.net> wrote:

>Your MOSFET is shown as a P type?? 33N10 certainly isn't..
>

I hate that mosfet symbol. I draw mosfets as



|
|-
--------| |
|>
|


and


|
|<
--------| |
|-
|


which is much more obvious.

John


From: dagmargoodboat on 4 Jul 2010 11:08
On Jul 4, 10:53 am, John Larkin
<jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote:
> On Sun, 4 Jul 2010 00:36:50 -0500, "Tim Williams"
>
> <tmoran...(a)charter.net> wrote:
> >Your MOSFET is shown as a P type??  33N10 certainly isn't..
>
> I hate that mosfet symbol. I draw mosfets as
>
>             |
>           |-
> --------| |
>           |>
>             |
>
> and
>
>             |
>           |<
> --------| |
>           |-
>             |
>
> which is much more obvious.
>
> John

I use the old symbol. I don't like it, but there it is.

Yours looks a little like an IGBT. Might that cause confusion?

James
From: John KD5YI on 4 Jul 2010 11:15
On 7/4/2010 6:22 AM, Grant wrote:

(snip)

> I don't know how to tell LTSpice how to model the TL431 and
> trust I'd get an accurate simulation. So it's the old soldering
> iron method for me. I think it doesn't do trimpots either, but
> it's been a while since I use LTSpice. Might have a go at it
> later.
>
> Grant.


Use the LT1431 which comes with LTSpice. Look in the Op-Amps folder.

Cheers,
John
From: David Eather on 4 Jul 2010 12:17
On 4/07/2010 11:29 PM, Grant wrote:
> On Sun, 04 Jul 2010 12:46:36 +1000, Grant<omg(a)grrr.id.au> wrote:
>
>> I've built a one amp current sink and ...
> ...
> It's now compensated and on overnight test :) New circuit is up too.
>
> http://grrr.id.au/current-sink/CurrentSink-circuit-2-750x567.jpg
>
> or, see http://grrr.id.au/current-sink/ for the revised web page.
>
> Restoring C1 across the 13V zener had no effect, adding supply bypass
> and the usual feedback compensation components worked first try. The
> circuit may be under-damped, I need to make a load step switcher so I
> can see how the circuit responds for dynamic response, another day.
>
> Makes small sparks when shorting the output with a nickel plated
> alligator clip to stainless steel resistor lug. Would you expect
> that from a one Amp constant current sink running from 24V?
>
> Power supply is fairly stiff, a pair of 12V, 100AH SLA batteries
> through a 35A auto spade style fuse and a couple or three metres
> of cable.
>
> Grant.


Would a small cap between GND and the junction of R4 and The mosfet gate
be of any use? SOmetimes a stopper resistor (R4) is not enough on its own.
From: John Larkin on 4 Jul 2010 12:31
On Sun, 4 Jul 2010 08:08:12 -0700 (PDT), dagmargoodboat(a)yahoo.com
wrote:

>On Jul 4, 10:53�am, John Larkin
><jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote:
>> On Sun, 4 Jul 2010 00:36:50 -0500, "Tim Williams"
>>
>> <tmoran...(a)charter.net> wrote:
>> >Your MOSFET is shown as a P type?? �33N10 certainly isn't..
>>
>> I hate that mosfet symbol. I draw mosfets as
>>
>> � � � � � � |
>> � � � � � |-
>> --------| |
>> � � � � � |>
>> � � � � � � |
>>
>> and
>>
>> � � � � � � |
>> � � � � � |<
>> --------| |
>> � � � � � |-
>> � � � � � � |
>>
>> which is much more obvious.
>>
>> John
>
>I use the old symbol. I don't like it, but there it is.
>
>Yours looks a little like an IGBT. Might that cause confusion?
>

It doesn't confuse me! Besides, my source and drain thingies come out
horizontal, and an IGBT uses angles, and a funny emitter thing.

And I don't use IGBTs!

The symbol lets you know, intuitively, which direction the current
flows, and that the gate is insulated, namely not a BJT. After that,
you have to look up the datasheet.

I've seen "my" symbol used in some IC equivalent schematics. I've also
seen


>> � � � � � � |
>> � � � � � |-
>> --------| |
>> � � � � � |_
>> � � � � � � |
>>
>> and
>>
>> � � � � � � |
>> � � � � � |-
>> -------o| |
>> � � � � � |_
>> � � � � � � |
>>

which I don't like much.

I draw mesfets and phemts just like jfets, because they behave that
way.

Oh, I put a dot in the middle of schottky diodes...

|\ |
| \ |
----------|* \|--------
| / |
|/ |

That's the hot carrier.

John

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