Below is the circuit diagram .As You easily remark  there is no major change except the coils and

the switch ,which is the former on/off switch  now acting for bandchange . The S1 in series with the battery is the switch on 5K pot.

10K Resistor

100K Resistor

A   G   B

G  =  GROUND

A  +  G =    60 pF

B  +  G  = 160 pF

  A  +  B  and  G = 220 pF 

Above are the details of  160+60 Pf Polyvaricon Variable lead connections

Mini Wavechange Switch

Pole (1) is connected to SW Coil and Telescopic Aerial.

Pole ( 2) is the middle lead and connected to the Input (I) of IC. and VC1

Pole ( 3) is  connected to MW Coil.

Pole (1) and (3) can be interchanged as per Your Wish

SOME LINKS TO SW CIRCUITS RELATED TO ZN414 OR EQUIV ALENTS :

A ZN414 SW Receiver by Andy Collinson.

A  MK484 SW RADIO by Tom Merryfield 

A Toroidal Core  ZN414 TRF SW  and a collection of other Two Wave

( MW and LW ) Receivers(some are already reflected under other links)

3 Band( 2 SW + MW ) Radio using LMF501T

The last of above articles is in Japanese but translation regarding info and coil details can be made by Online Bing or alternative translator.

Volume Control