Hi all
I am getting back into electronics project building after a long break (40 yrs), I have just about got my workshop ready and tooled up, so much has changed,
firstly i am having difficulty locating some IC op amps from suppliers (obsolete)
they are -: MN3004, MN3101, NE570N, i got these part Nos from "Electronic projects for guitar by RA Penfold.
Can anybody please help with the alternative part Nos

Many thanks
Den

 

Can you post a link to a schematic of the project you're interested in?

 

Hello,

The mentioned chips are special audio related chips.
The MN3004 is a BBD (bucket brigade delay).
The MN3101 is the clockchip for the MN3004.
The NE570 is an expander chip.

If you want schematic related to guitar effects, you might want to visit the following page:
http://www.geofex.com/

Bertus

 

I've found the best place to buy obsolete ICs is Ebay. The shipping is usually very low if you're just buying a handful of ICs, even if they're from another country, so it's affordable. I've bought those BBD chips on there myself (MN3004 and MN3101). People warn about "counterfeit" IC's from China but I've bought dozens and dozens of ICs from China and never had any problems, and they arrive surprisingly quickly (often only about a week after purchase). Good luck!

 

Ebay means exactly what? It is the same saying "I bought them from someone on the street".

 

I'm just saying that there is so much stuff for sale that there is usually someone selling whatever you need.

 

they are -: MN3004, MN3101, NE570N, i got these part Nos from "Electronic projects for guitar by RA Penfold.
Can anybody please help with the alternative part Nos

if you are restarting, you should ask if you want to restart on the same subjects. if you do, then ask yourself what those chips do and what chips today can do the same. finding highly specialized and off brand old chips can be difficult / expensive. finding their modern alternatives (functionally) may be better.

 

I just picked one of your parts: The NE570; http://www.digikey.com/product-detail/en/on-semiconductor/NE570DG/NE570DGOS-ND

A lot of things have happened in 40 years. The big things are:
1) The use of lead free solder
1a) Higher Temperatures. Harder to work with,
1b) Solder comes in a paste form
2) The migration to surface mount (SMT). The DIP package is on the way out.
2a) Labor has decreased
3) ROHS - the reduction of Hazardous substances contained in IC's.
3a) All IC's that they kept basically got new suffixes when the hazardous substances got removed.

4) A temperature controlled solder/desolder station with both iron and hot air is almost becoming mandatory.

So, the NE570 is a compander, but SEEMS to be made in the SMT version. www.proto-advantage makes adapters that convert SMT to DIP. They can place the part for you on one of their adapters for an additional charge IF the part has a DigiKey part number.

www.UTsource.net which is an obsolete parts source has the NE570N

I've used he links mentioned. Best bet, is likely to have the SMT part version placed on an DIP adapter and work with that.