bit-tech.net

Go Back   bit-tech.net Forums > Modding > Modding

Reply
 
Thread Tools View Mode
Old 24th Feb 2003, 17:16   #1
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Substitutions for LM308 Op Amp IC ?

Hi,
Does anyone know of a IC which can substitute the LM308? Need this for a IR project I'm working on. Fast answers are greatly appreciated...
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 19:32   #2
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Do you think the LM741 could work???
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 19:52   #3
eaterofpies
I *am* a Dremel
 
Join Date: Feb 2002
Posts: 1,745
eaterofpies has yet to learn the way of the Dremel
isnt the 308 a quad op amp? tho at college we used 741 and 108 without worrying which it was really (tho pinout might be different) *shrugs* we just looked up the pinout when we needed em
eaterofpies is offline   Reply With Quote
Old 24th Feb 2003, 19:57   #4
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Yep, an op amp. So you think I could use the 741, then? I have datasheets of both, so the pinouts aren't a problem.
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 20:05   #5
eaterofpies
I *am* a Dremel
 
Join Date: Feb 2002
Posts: 1,745
eaterofpies has yet to learn the way of the Dremel
u may have to rearrange the pinouts and will definitelyu if u r moving from 308 to 741 because a 308 has 4 op amps in it and a 741 has 1 op amp in it ok?

and i think they actual specs of the op amps are similar but i cant remember too well

best look at the datasheets yerself and work it out
eaterofpies is offline   Reply With Quote
Old 24th Feb 2003, 20:11   #6
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Thx! I'll take a better look at the sheets tomorrow. I'm getting a bit tired now (it's 21:11 here)
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 20:19   #7
eaterofpies
I *am* a Dremel
 
Join Date: Feb 2002
Posts: 1,745
eaterofpies has yet to learn the way of the Dremel
its 8 pm here and ive still got to write a lab report *grumbles*

ok so a bit off topic

oh and a lab report is pretty much an essay
/me hates essays
eaterofpies is offline   Reply With Quote
Old 24th Feb 2003, 20:20   #8
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
lol At least I don't have to work on any lab report, but I have an essay to write... (whoops, bit off topic... )
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 20:22   #9
cpemma
Ecky thump
 
cpemma's Avatar
 
Join Date: Nov 2001
Location: S.Yorkshire, OK
Posts: 12,329
cpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysis
It's a bit more upmarket than a 741, so tread wary.
Quote:
The LM108 series are precision operational amplifiers having specifications a factor of ten better than FET amplifiers over a -55C to +125C temperature range.

The low current error of the LM108 series makes possible many designs that are not practical with conventional amplifiers. In fact, it operates from 10 M Ohm source resistances, introducing less error than devices like the 709 with 10 k Ohm sources. Integrators with drifts less than 500 V/sec and analog time delays in excess of one hour can be made using capacitors no larger than 1 F.
cpemma is offline   Reply With Quote
Old 24th Feb 2003, 20:24   #10
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Upmarket?
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 20:41   #11
eaterofpies
I *am* a Dremel
 
Join Date: Feb 2002
Posts: 1,745
eaterofpies has yet to learn the way of the Dremel
the 108 is a better ic probably better response over different temps / frequencys

if your doing stuff that requires a high quality signal where the shape / amplification ammount matter a lot use 108. if on the other hand it dosent matter too much about the quality of the signal or accuracy (led temp sensors etc) then go cheep

hmmm sorry im not so good at explaining
eaterofpies is offline   Reply With Quote
Old 24th Feb 2003, 20:49   #12
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Not good at explaining? I understood pretyy clear what you meant. Could I substitute the 308 with a 108/208, then?
Plasma is offline   Reply With Quote
Old 24th Feb 2003, 21:04   #13
cpemma
Ecky thump
 
cpemma's Avatar
 
Join Date: Nov 2001
Location: S.Yorkshire, OK
Posts: 12,329
cpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysiscpemma can run Crysis
108, 208 and 308 are all about the same specs, just the first is single, second dual and third a quad package.

Full spec
cpemma is offline   Reply With Quote
Old 24th Feb 2003, 21:12   #14
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Ok, so I just went through Elfa's online catalog of op amps again. I turns out they have none of the LMx08's!?! I think that's too bad. Does anyone know of a place which sells these to Norway (online) with good prices, and not to high shipping?
Plasma is offline   Reply With Quote
Old 25th Feb 2003, 14:58   #15
Plasma
Multimodder
 
Plasma's Avatar
 
Join Date: Nov 2002
Location: Norway
Posts: 144
Plasma has yet to learn the way of the Dremel
Ok, I think I've found a godd substition, the NTE938. And ELFA GOT IT!!
Plasma is offline   Reply With Quote
Reply

Thread Tools
View Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 14:17.
Powered by: vBulletin Version 3
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.