TGSL help

[metaldetector107]

Hi all
i have tested my tgsl today the sound not stable it is like tak tak tak tkkkk olso doesnt detect anything when i move the tx rx coil the sound changes but still not detecting i am using 741 instead LM308 so please help me
please note i have connected the 1k missing resistor after 22n and +8

thanks again

[Unregistered]

please note i have connected the 1k missing resistor after 22n and +8
thanks again

who said you could use 741 instead 308 you ask before then dont listen how can any help you not take time good describe which 1k resistor you dont take advice you need mor help than i have time

is your time so important you cant use punctuation stop running your words together

[Unregistered]

Brother unregistered; 741 if used, will degrade performances for sure, yet device must work and have some detection. But here it is case with no detection, so problem is not in 741 but somewhere else. So in testing purposes (only) 741 could be used and later replaced with more suitable one. If 741 used than omit 100pf on 8.pin.