[sdiy] LM301 vs LM308 in feedforward compd filters

[anthony]

I thought the 301 was pretty slow too unless you used a feedforward 
compensation network.

So does the 308 not benefit as much from feedforward as the 301?
I just thought it might since it's also noncompensated.

The datasheet I have for the 308 isn't all that helpful either. Especially 
since it treats the LM101 along with it which I'm guessing has much better 
specs.

But a chart that I have that compares many opamps shows the 301 to have a 
slew rate of 0.5V/uS and the 308 0.3V/uS

Hardly an order of magnitude's difference, but the chart doesn't consider 
performance with compensation.

So my question is which one would you guys use?

I'd sure like info that shows the huge disparity in performance between 
these two though.

The datasheets are interesting but don't quite answer my questions.  The 
applications for the 308(108) show using a 101 to increase the speed and 
bandwidth.

But I suppose the main thing I'm wondering is does the 308 benefit in speed 
from feedforward compensation as does much as the 301 does. The datasheet 
says it does, but not really how much. It also says that the LM108 is 
/interchangeable/ with the LM101 and uses the same compensation. But another 
compensation scheme can be used to reduce power supply noise etc... So would 
the same be true for LM308 & LM301?

I can tell the LM108 is better than the LM308: higher input impedence etc...
I hate it when the datasheet I have is really for a different part and the 
part I have is just along for the ride.

I guess I /could/ just say "Ah nevermind. I can get 301's a lot cheaper than 
308's anyways. And besides I have more 301's than 308's."

Just thought I could get an edge.
I suppose my effort could be better spent on something else...

> LOL !!!
>
> sorry, you are not wrong !
>
> H^) harry
>
> Michael Ruberto wrote:
>
>> Somebody correct me if I'm wrong but the LM308 has a slew rate many 
>> orders
>> of magnitude slower than the LM301.
>>
>> M. A. Ruberto
>>
>> >From: "anthony" <aankrom at bluemarble.net>
>> >To: <synth-diy at dropmix.xs4all.nl>
>> >Subject: [sdiy] LM301 vs LM308 in feedforward compd filters
>> >Date: Wed, 3 Aug 2005 19:07:48 -0500
>> >
>> >I've been slowly putting together an adaptation of Juergen Haible's
>> >Stormtime Flanger (when I'm not working on my Dim C clone) using 2 
>> >R5106's.
>> >
>> >He mentions that the filter at the input is built around an LM301 and 
>> >won't
>> >work with othr opamps. But I have some LM308's and it seems like these
>> >/would/ work since I think they benefit from feedforward compensation 
>> >like
>> >the 301.
>> >
>> >Actually I have some of both opamps I was just wondering if there might 
>> >be
>> >some adavantage to using the 308 over the 301. The 301's are a lot 
>> >cheaper
>> >though...
>> >
>> >
>> >aa
>> >
>> >
>
>