[sdiy] Sub for LM324?

[James Patchell]

Judging by the circuit diagram at that page, I would say, NO, it is going 
to be difficult to sub just any opamp.  They seem to be taking advantage of 
the fact that the common mode input range is going down to the pin 11 
voltage, plus, the power supply voltage is +5 volts.  For example, a TL084 
would not at all be happy in this circuit...  There are some newer low 
voltage opamps that probably would be happy....difficult to say if they 
would be a better choice than a 324...the 324 is a very nice opamp for 
general purpose applications...(putting on flaming arrow proof 
vest....waiting for barrage from Harry :-)

At 02:28 PM 2/21/2005 -0500, Bill Berzinskas wrote:
>this one is another example
>
>http://m.bareille.free.fr/ds7clone/ds7.htm
>
>----- Original Message ----- From: "Bill Berzinskas" <wberzinskas at nc.rr.com>
>To: "James Patchell" <patchell at cox.net>; <synth-diy at dropmix.xs4all.nl>
>Sent: Monday, February 21, 2005 1:48 PM
>Subject: Re: [sdiy] Sub for LM324?
>
>
>>for example, the syntom, syncrash, synchime circuits,,
>>all drum tone.. seem to me to be a similar design, also similar to some 
>>other things i've saw..
>>
>>----- Original Message ----- From: "James Patchell" <patchell at cox.net>
>>To: <synth-diy at dropmix.xs4all.nl>
>>Sent: Monday, February 21, 2005 1:25 PM
>>Subject: Re: [sdiy] Sub for LM324?
>>
>>
>>>It depends on the circuit.  In general, yes, any opamp can sub for any 
>>>other opamp.  However, the LM324 is rather unique in that the common 
>>>mode input range of the inputs can go down to the voltage at the 
>>>negative voltage terminal (Pin 11).  If the design takes advantage of 
>>>this feature, then the answer is no.  I would have to see the specific 
>>>circuit to give you a firm answer.
>>>
>>>At 12:57 PM 2/21/2005 -0500, Bill Berzinskas wrote:
>>>>Can I just sub any opamp for a lm324?   i'm looking at some drum tone 
>>>>schems, and most are 324..  whats the differences here?
>>>
>>>         -Jim
>>>***************************************************************
>>>http://www.oldcrows.net/~patchell
>>>
>>>***************************************************************
>>>
>>>
>>
>>
>

         -Jim
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http://www.oldcrows.net/~patchell

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