SOME LINKS OF IMPORTANT REFERENCE RELATED TO ZN414 AND EQUIVALENTS:
The Radio Board(Forum)
MDS975.co.uk
Cool386 webpage of John Hunter from Australia
Homepage of Alan Yates
Homepage of Dick Cappels
Homepage of Owen Pool
A Valuable Radio Book
ZN414 Info by Wikipedia
Homepage of Austin Hellier
Jaycar (Ferranti Datasheet)
Rapid Datasheet No.1
Rapid Datasheet No.2
Kitsrus MK484 Kit
Two Wave MK484 receiver and various circuits by Raymond Haigh
1.5 Volts - Medium Wave Radio
ZN414  Receiver of G.A. French (March 1975 issue )
Mono Jack Plug
Mono Socket
Stereo to Mono
Adapter
Homepage of Scott Loewe
e-mail of Kelvin
ebaY Page of Kelvin
Volume Control
Stereo Socket
Stereo Plug

Homepage of George and Jenny
Circuits Today Homepage
LMF501T Database of Mitsumi
A Reliable and Friendly ebaY Seller of TA7642 for a reasonable price
Irwin Math's Notes,
Another MK484 Receiver
MK484 Radio Designs of VK6FH
MK484 radio with loudspeaker
Some interesting links (In German)
A simple TA7642 Receiver recommended by Burkhard Kainka
A MK484 Radio
RBO Website (A Page from Belgium )
Retro Radio by Franzis Verlag of Germany
A Matchbox Radio
Dear Visitors,
Above links contain a wealth of information related to ZN414 and equivalents.
I tried to exclude as much as I can more detailed circuits which is beyond the scope of this modest article. You may however use the IC Stage for your own extension.
I also tried to refrain including homepages with identical content.There are a lot of other
references in Japanese , Chinese, Korean  etc homepages which can be reached via the search engine Google .
The information reflected in such languages can be translated by the aid of
online translators.Some translations are in broken English; however they  are still sufficient to give a  good idea, tips etc. regarding the article.
Thank You for Your Interest in Reading My Article.

     
An Alternative link by Geoffrey Brown to Above Sources
Mitsumi LMF501 shares the fate of ZN414
An Alternative Circuit ( in Japanese)