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70cm In-band Talk-Through

Rather than buy a metre or two of 3 wire or 4 wire cable, see what you already have.  An old mouse cable, USB cable or keyboard cable may be suitable.

About those dreadful 6 way mini-DIN plugs.  Tension on the cable shouldn't put any tension on the thin conductors soldered to the pins or they will snap.  The cable grip should slightly squeeze the outer cable insulation.  If your cable is a small diameter, increase it within the cable grip using PVC tape, a rubber sleeve, heat shrink tubing etc.

The links to the Maplins web site and prices are from August 2012.

Component

Value

Maplins Code

Price

Note

PLG1

6 way mini-DIN

JX04E

1.29

Receive plug

PLG2

6 way mini-DIN

JX04E

1.29

Transmit plug

IC1

SFH618-2

CY94C

1.39

Opto-coupler

R1

1K Ohms

M1K

26p

Up to 5K works

VR1

50K Ohms

N54BR

59p

Not fussy

T1

Blue LT44

HX82D

2.29

Transformer

 

4 wire cable

XR89W

99p

  1 metre

Box

T2 plastic

KC91Y

2.79

Large but cheap

Total

10.89

 

Stripboard

Think!

JP47 ?

3.49

Best to buy large and cut off as required.

 
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Page updated on 09 January 2017

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