4 Gang AM FM Variable Capacitor 266pF 20pF X2 With Screws

This is one item of new variable capacitor comprising two 266pF AM sections and two 20pF FM sections. Three M2.5 6mm length screws are provided along with three M3 nuts for use as spacers.

All the sections can be connected together if required to create 572pF in total for receiving loop antennas or for a crystal set tuning capacitor which calls up 500pF. The matching 266pF sections allow use in low power Z-match type antenna matching circuits. The shaft is a standard short type of 6.0mm diameter and it measures 4.0mm across the flats. The thread in the middle of the shaft is M2.5, as are the two mounting holes.

I have this available with a plastic shaft extension and a suitable knobs on another listing in the shop.

The trimmer capacitors C1 to C4 on the rear measure about 15pF maximum. These C1 and C2 are internally connected across the two FM sections but C3 and C4 have separate external connections rather than internal connections to the AM sections. All the connections have long, easy to solder tabs or they can even be connected without soldering using 2A terminal block connectors. Connection diagrams are shown in the pictures.

Connection Diagram Key

A Common (GND)
B VC1, 20pF + C1 15pF trimmer, FM
C Common (GND)
D VC2, 20pF + C2 15pF trimmer, FM
E VC4, 266pF, AM
F VC3, 266pF, AM
G C4, 15pF trimmer
H Common (GND)
I C3, 15pF trimmer

Headline Specs:

Maximum voltage: 100V DC
Mounting bolts: 3X M2.5, 6mm length provided
Bolt spacers 3X M3 nuts provided
Mounting bolt separation: 14mm
Overall box dimensions: 22 x 22 x 17mm
Height including shaft: 21mm
Shaft length: 4mm normal, 16.5mm with extension