TL071 replacement

[metaldetector107]

hi all
please help with this

[rael]

Hi,
What is the problem?
This schematic is too difficult?
For what it is needed this schematic?
Maybe is needed to change schematic, not the amplifier?

[kt315]

hi. you think (and maybe hope) your schematic is super and fresh. but you are deeply mistaken I must say. the schematic is not new very oldie and has been discussed many many time ago. nothing new. turn on another projects I can suggest you only. a waste of time what you did dig from Internet bottom out and in nerve effort trying get out the holy metal. this authour was here and did speak many texts. WHERE IS HE NOW -?
a space is silent on that. white noise is only noise.
gold does people crazy...

yours

[WesP]

Diffrent Ver. same MD

Check this link. This one does away with the need for a radio.
http://servo.texterity.com/servo/200401/?pg=68
http://servo.texterity.com/servo/200401/?pg=70
http://www.servomagazine.com/media-f...ack-fig-3b.tif

[Max]

hi all
please help with this

Hi,
good and about easy replacements are TL081, LF351, TLC271, LM301 or also CA3140.

Now are about all obsolete stuff... but some still in production.

The LF351 was very popular a 20years ago... used in many stuff...others a bit little priced so you find in later stuff and more rarely.

You can find in old electronics all them about easy, check expecially old analog instruments, meters etc but can find in many electronic junk of past 20years. Even unexpected stuff could have them inside... like old house gas detectors... cause are general purpose stuff.

Kind regards,
Max