[sdiy] LM301 vs LM308 in feedforward compd filters

[Bob Weigel]

The 308 was developed as a 'tight spec' amp with very nice input design 
having exceptional characteristics for a bipolar on offsets and input 
bias particularly.  Naturally there are compromised aspects that result 
in other areas and slew rate would be a logical one to suffer. They 
appear in some old instrumentation circuitry but I seldom see them find 
use in music applications though I have seen them a time or two. Trying 
to recall where. But they are more expensive and their emphasis of 
design is not needed in most audio apps right off the bat... -Bob

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
>>
>>
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