component I.D please?

[Neil Groves]

This is my other project that i'd like to build before i finally sit down and actually learn some analogue electronics:

https://www.electro-tech-online.com/custompdfs/2011/12/Syntom.pdf

Can anyone I.D IC1 for me, i assumed it was a au741 but the way it is connected here doesn't make sense with the pin out for this device?

Neil.

 

[House0Fwax]

Did you not scroll down? After the scan you'll see this --> "Since it's impossible to read the parts list for the Syntom circuit, here it is...."

 

[Neil Groves]

No i didn't, let me go look.

Neil.

 

[Neil Groves]

ooops!....lol sorry guys *red face*

I still have another question though, pin 1 isn't an output according to the pin out for this device?

 

[Nigel Goodwin]

ooops!....lol sorry guys *red face*

I still have another question though, pin 1 isn't an output according to the pin out for this device?

No, it's pin 6, as is 'clearly' shown on the PCB layout.

I've just tried to find the original article, and I'd have posted a better scan - but I can't find that issue.

It's from 1981, so 30 years old - there were a number of Syn???? projects that year, and the magazine ended at the end of the year, and became 'Electronics - The Maplin Magazine'.

 

[Neil Groves]

Thanks for the mag info Nigel....i didn't think to check the schematic against the PCB layout which of course would have explained it.

I am learning so many techniques and fault finding clues from you guys, this is an amazing forum.

thankyou so much!

Neil.