[sdiy] OpAmp question

[Seb Francis]

I don't think you will find anything that will pull both to ground and 
the positive supply rail (but I might be wrong?)

I always use the LM358 when I need an opamp that goes down to ground.  
The quad version of this is the LM324 (or LM124/LM224/LM2902).  It's not 
FET though, and the common-mode voltage range only goes up to approx 
1.5V below the +ve power rail.

Seb


Carsten Tönsmann wrote:

> That is exactly what I mean.
>
> I designed and built a simple circuit to scan a Fatar keyboard. This 
> circuit uses TL064 comparators to get the binary information key 
> pressed / key not pressed. The TL064 are supplied with 5V and 0V and 
> it seems that they don't do the job correctly. So before I do a 
> redesign of the circuit I want to try opamps which can pull to ground 
> and to 5V.
>
> -Carsten
>
> ----- Original Message ----- From: "James Patchell" <patchell at cox.net>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, September 05, 2005 10:28 PM
> Subject: Re: [sdiy] OpAmp question
>
>
>> Define single supply....
>>
>> Any opamp can run on a single supply.  Generally, when people say 
>> single supply, they are referring to an opamp whose common mode imput 
>> range includes the negative rail (ground) and whose output can also 
>> go down pretty close to ground....
>>
>> If you do not require either of those atributes...then the TL074/084 
>> fit the bill....
>>
>>
>> At 01:45 PM 9/5/2005 +0200, Carsten Tönsmann wrote:
>>
>>> Hi list,
>>>
>>> does anybody know a single supply fet input quad opamp which can be 
>>> obtained in DIP? The AD824 only exists in SMD format...
>>>
>>> Thanks in advance
>>>
>>> Carsten
>>
>>
>>         -Jim
>> ***************************************************************
>> http://www.oldcrows.net/~patchell
>>
>> ***************************************************************
>>
>>
>>
>
>
>