lm324 op amp

[Tim Wescott]

Tim Shoppa wrote:

Tim Wescott <tim@wescottnospamdesign.com> wrote in message news:<10mghcf7uhovm84@corp.supernews.com>...

How negative? Are you going below the negative rail?

http://www.analog.com/library/analogDialogue/Anniversary/6.html


Ha! That was an enjoyable little read. I especially liked

The figure was drawn with thermionic tubes to avoid any suggestion of
partiality in favour of any particular semiconductor device. Since
thermionic devices at present are not generally available in IC chip form

I'd never seen that section of their website, I gotta read the rest
now

Tim.
"Not _generally_ available". I didn't even notice that -- I just

searched down to the section on phase inversion to make sure that it was
what you were looking for. Now _I_ gotta read it...

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Joerg]

Hi SioL,

BAV70, dual SMD schottky.


These are not Schottky but regular diodes. They are great diodes and I

just used them in a design last week. Basically the same as BAV99 except
that the BAV70 is common cathode.

Regards, Joerg

http://www.analogconsultants.com

 

[M.Randelzhofer]

"Joerg" <notthisjoergsch@removethispacbell.net> schrieb im Newsbeitrag
news:cFlad.11075$nj.3317@newssvr13.news.prodigy.com...

Hi Winfield,

... Schottkys are kind of pricey.



Not that bad... For example, Vishay BAT82S (44348 in stock),
SD101A (16922 in stock) are both $0.03, qty 1k at Newark, $0.05
in singles, and the LS101C smd part a bit more, $0.04 for 1k...


That is a good price for a Schottky diode. Wish they were in SMT though.
This could actually beat the transistor which can be had under 2 cents
but it needs a resistor for base current and that adds a penny back in.

The BAT54S is SMT but over 10 cents. Well, at least you get two in one
SOT23 pack for that. They are nice for building mixers.

Regards, Joerg

http://www.analogconsultants.com

The BAT54xW in a SOT323 / SC70 case seems to be much cheaper. A 3000 reel
costs me 2.5 euros per 100 - the SOT23 was 8.5 euros.

MIKE

 

[Joerg]

Hi John,

But be careful: a small-signal schottky may not conduct hard enough to
protect an LM324!


The OP was only concerned about the input where you could limit the max

current. But you have a point here since the LM324 abs max is spec'd at
300mV. Less than a Schottky would offer. So I'd still favor either the
reversed transistor or a pre-biased silicon diode.

Regards, Joerg

http://www.analogconsultants.com

 

[Daniel Haude]

On 10 Oct 2004 03:17:51 -0700,
Tim Shoppa <shoppa@trailing-edge.com> wrote
in Msg. <bec993c8.0410100217.3810f8b7@posting.google.com>

I'd never seen that section of their website, I gotta read the rest
now

Same here; I think it's fantastic!

--Daniel

--
"With me is nothing wrong! And with you?" (from r.a.m.p)

 

[Jim Thompson]

On Sat, 9 Oct 2004 20:34:09 +0100, "timmmmayyy!"
<timmmmayyy@nospamplease.com> wrote:

Has anyone found this problem,

When a negative voltage is connected to the input of this op amp the output
will go positive, and the other outputs will go slightly positive.

Do you know what causes this?

Thanks

Duh!?!?

...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.