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From: eegauthe@cybaswan.UUCP (o)
Newsgroups: sci.electronics
Subject: Re: 1458/4558 pin compatable op-amps?
Summary: Other op-amps
Message-ID: <462@cybaswan.UUCP>
Date: 25 May 89 08:41:04 GMT
References: <2185@thor.acc.stolaf.edu>
Reply-To: eegauthe@cybaswan.UUCP (Olivier Gautherot)
Organization: University College of Swansea, UK
Lines: 33

In article <2185@thor.acc.stolaf.edu> holdenm@thor.stolaf.edu (Mark Holden) writes:
>
>	I'm looking for pin-compatable replacements for 1458/4558 op-amps.
>It's for an audio application, so I'm looking for the best frequency response
>(secondary) and the lowest noise (primary).  

The few references I know that would fit your needs are:
	TL071 - TL081 - LF353 uA772: all those are equivalent cheapy dual
		op-amps . The input equivalent noise level is around
		15-18 nV/(Hz)^1/2, and the gain * band product is around 3MHz
		(not bad for microphone amplifiers)

	NE5532 - LM833: those ones are a bit more expensive but the result is
		better: noise level around 5 nv/(Hz)^1/2 and gain * band of
		10 to 15 MHz (very good mic amps!)

>	Are there any ones that have a FET *output* stage, or don't such
>things exist?

Sorry, I haven't heard about such devices.

Hope that helps.

	Olivier.




-- 
Olivier GAUTHEROT,// Postgraduate // Electrical Engineering Dept.
University of Wales // Swansea, SA2 8PP, U.K.	(+44 792 205678 ext 4564)
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