What's a Good Sub for a 45V Zener?

[JeffM]

the turkeys shut down the electronics prog at our college
Watt Sun

Which school is that?

 

[Jim Thompson]

On Mon, 29 Mar 2004 14:30:59 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"JeffM" <jeffm_@email.com> wrote in message
news:f8b945bc.0403290915.7b44fe1a@posting.google.com...
the turkeys shut down the electronics prog at our college
Watt Sun

Which school is that?

www.sac.edu or more specifically
http://www.sac.edu/faculty_staff/academic_progs/departments/index.htm
where electronics technology is not clickable.

But they offer DANCE! (I couldn't find Basket Weaving ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Watson A.Name - \"Watt Su]

"Jim Thompson" <thegreatone@example.com> wrote in message
news:029h60tbubbvfvmecuki7bn77sv47k3ih0@4ax.com...

On Mon, 29 Mar 2004 14:30:59 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"JeffM" <jeffm_@email.com> wrote in message
news:f8b945bc.0403290915.7b44fe1a@posting.google.com...
the turkeys shut down the electronics prog at our college
Watt Sun

Which school is that?

www.sac.edu or more specifically
http://www.sac.edu/faculty_staff/academic_progs/departments/index.htm
where electronics technology is not clickable.

But they offer DANCE! (I couldn't find Basket Weaving ;-)

A suitable substitute would be pottery.

Right now I'm rather POed. Last wk I attempted to sign up for a service
having to do with electronics. I got as far as the $50.00 fee, which
was _not_ mentioned up front, and I backed out of it, but before I
backed out, I had filled out a form with my address, email address, etc.
and sent it.

Now the SOBs are sending me spam at my work email address for some SoC
conference! Dirty rotten SOBs are using my email address! Yes, there's
an unsubscribe link at the bottom, but odds are that even if I do unsub,
they'll sell the addr to some other related org to spam me some more.

Luckily we're implementing Sophos Pure Message(TM) at work. Costing us
a bit of money, but there are a whole lotta people getting spammed to
death and especially the p0rn, it's making a lotta people mad. Has
legal implications of a hostile workplace, etc. So after complaints
from the president, the decision was finally made.

On another front, I watched the spams build up in the junk email folder
of my Yahoo acct all last wk from Sun night to Sun night, and I got 75
spams. Nasty ones, too. They do things in the Subj line like "account
overdue" or other trickery, now clearly illegal. The amount of mortgage
ads and "c1al1s" (they never spell it right) ads were unbelievable. I'd
been deleteing a few every day, turned out it was more than ten a day.
Now they are _all_ going directly to the trashbin, no waiting.

...Jim Thompson
--

 

[Jim Thompson]

On Mon, 29 Mar 2004 20:32:52 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:029h60tbubbvfvmecuki7bn77sv47k3ih0@4ax.com...
On Mon, 29 Mar 2004 14:30:59 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"JeffM" <jeffm_@email.com> wrote in message
news:f8b945bc.0403290915.7b44fe1a@posting.google.com...
the turkeys shut down the electronics prog at our college
Watt Sun

Which school is that?

www.sac.edu or more specifically
http://www.sac.edu/faculty_staff/academic_progs/departments/index.htm
where electronics technology is not clickable.


But they offer DANCE! (I couldn't find Basket Weaving ;-)

A suitable substitute would be pottery.

Right now I'm rather POed. Last wk I attempted to sign up for a service
having to do with electronics. I got as far as the $50.00 fee, which
was _not_ mentioned up front, and I backed out of it, but before I
backed out, I had filled out a form with my address, email address, etc.
and sent it.

Now the SOBs are sending me spam at my work email address for some SoC
conference! Dirty rotten SOBs are using my email address! Yes, there's
an unsubscribe link at the bottom, but odds are that even if I do unsub,
they'll sell the addr to some other related org to spam me some more.

Luckily we're implementing Sophos Pure Message(TM) at work. Costing us
a bit of money, but there are a whole lotta people getting spammed to
death and especially the p0rn, it's making a lotta people mad. Has
legal implications of a hostile workplace, etc. So after complaints
from the president, the decision was finally made.

On another front, I watched the spams build up in the junk email folder
of my Yahoo acct all last wk from Sun night to Sun night, and I got 75
spams. Nasty ones, too. They do things in the Subj line like "account
overdue" or other trickery, now clearly illegal. The amount of mortgage
ads and "c1al1s" (they never spell it right) ads were unbelievable. I'd
been deleteing a few every day, turned out it was more than ten a day.
Now they are _all_ going directly to the trashbin, no waiting.

Yep, I'm going to systematically retire my well-known E-mail address
because of such crap, and create an obscure one :-(

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Jan Panteltje]

On a sunny day (Tue, 30 Mar 2004 07:43:01 -0800) it happened "Watson A.Name
\"Watt Sun - the Dark Remover\"" <NOSPAM@dslextreme.com> wrote in
<c4c4fj$6h4bm$1@hades.csu.net>:

Jan Panteltje wrote:
On a sunny day (28 Mar 2004 06:21:15 -0800) it happened
superscan811@operamail.com (Scott B) wrote in
4647a23d.0403280621.6bf5058e@posting.google.com>:


I'm a newbie, no in-depth knowledge expressed or implied.
Don't know whether this may be usefull but have a look at this site
Harry's Home Brew...

http://w1.859.telia.com/~u85920178/power/vconv_01.htm

He has a lot of usefull circuits and at worst there are several ways
to make your own Alcohol...

Cheers

It is a cool circuit, but these multipliers have high zi, so
can deliver little current.
Much simpler is to use a small pot core transformer, anyone can wind
some turns on it, much less components, more reliable,
better efficiency (all the diode voltage drops).
-------------------------------- + 5V
| |
--- 10u |
=== /
| b |<e
| ---| BC557
| | |\ c (general purpose PNP)
| | \
| | | -----------|>|---------------- + 45V
| | | | | 1N4148 |
|-- --- || {82t | |
| | 1t} | -{ | |
2k2 [ ] | | | {10t === ===
| ----- | | | 22n --- 10u
| pot core| | pol |
---------------------------------------------------------- GND

Something like this.

If you want to regulate / stabilize the output, I have done this
by using a series transistor in the input power, and using the
output via a voltage divider and zener / transistor to control that.
But that is less efficient.
To some extend you could try to control the base current of the bc557,
but that is always a bit tricky.
JP

Here's a schem of one way to regulate the output. Ignore the Jpn font
error msgs and nonsense, just look at the pic.
http://www-user.interq.or.jp/ecw/manu/L-0010.pdf
Yes, good stuff, cannot read the values, all little dots, but still

good stuff.
JP

 

[Winfield Hill]

Fred Bloggs wrote...

Winfield Hill wrote:

. +130 - 170Vdc
. Vin Linear High-Voltage Regulator
. ---+---220----, with 300uA quiescent current
. | 10W | Vbe band-gap voltage reference
. 270k |--'
. | ||<-, Q2
. +------||--+ IRF630
. | , 12V | with heatsink
. +--|<|-----+
. | |
. | Q1 +----o +100V
. | LND150 | to 100mA
. '--| 1.00M
. ,->|| |
. +--||------+
. | |
. \_|_ |
. / \_________| 1.24V
. /___\ |
. | 12.4k
. | LMV431 |
. --+----------+-----

I've also added a resistor in series with Q2's drain, to act as
a poor-man's current limit. It keeps output shorts from causing
complete mayhem, restricting the mayhem to its poor self. Any
serious user of this circuit would want a conventional foldback
current limit added in Q2's source pathway, but showing that here
would mess up the already-cluttered ASCII drawing.

Now the challenge is to come up with a similar simple circuit for
a linear negative high-voltage regulator.

LOL- BULL!

LOL, yourself! :&gt Actually a negative version is easy at first
glance: Q2 can be a high-voltage (to 500V) p-type power MOSFET, and
the LMV431 can be replaced by LM385-ADJ, which works in an inverted
fashion, with its 1.24V reference running from the positive-most pin.
The problem is Q1, and the answer must be to give up and use small
high-voltage PNP transistors, biased with extra resistors, etc.

The benefit from the extra circuitry is a better, tighter regulator
than is possible with the classic zener-diode transistor-feedback
high-voltage regulator circuit, e.g., as shown below.

.. +130 - 170Vdc
.. Vin Linear High-Voltage Regulator
.. ---+---220----, zener-based voltage reference
.. | 10W |
.. 150k |--'
.. | ||<-, Q2
.. +------||--+ IRF630
.. | , 12V | with heatsink
.. +--|<|-----+
.. | 1n5242 |
.. | +----o +100V
.. | 2n5500 | to 100mA
.. | Q1 93.1k
.. \| |
.. |--------+
.. v/| |
.. | |
.. \_|_ 6.81k
.. /_\ 6.2V |
.. | 1n5234A |
.. --+----------+----

This circuit relies on the special properties of zener diodes with
breakdown voltages in the 6-volt region (see AoE pp 332 - 333).

Obviously this circuit can be easily adapted to negative operation
(e.g., with Q1 = 2n5401, Q2 = IRF9630, etc., for 125V and below).

Versions of this circuit I've designed generally have included a
loop-compensation cap across Q1's c-b junction with a concomitant
Veb protection diode.

Thanks,
- Win

whill_at_picovolt-dot-com

 

[Jimmy]

"Fred Bloggs" <nospam@nospam.com> wrote in message
news:40644071.1040402@nospam.com...

could not see the original post so I am going to take a shot that the
proble is finding the 45 volt zener at the current he wanted as small ones
arent that hard to find. To increase the current rating of a zener just
connect it from collector to base on an appropriate sized transitor. now the
collector and emitter will act as a high current zener.