Crystal radio evaluation board with Cat’s Whisker,DIY no soldering Germanium


A circuit board which allows experimentation with Crystal radio. The board comes pre soldered and various components are added to the terminal strip. Different germanium diodes can be substituted to compare.

A cat’s whisker and Iron Pyrite crystal is included, other crystals could be substituted. Four inductors are included to cover a wide frequency range, you could also connect an external wound coil or ferrite rod and coil. ( not supplied in this kit).

Inductors Supplied

AM  inductor    1000uH    Brown Black Red                         423KHZ -1.7MHZ

AM  Inductor       470uH   Yellow Violet Brown Silver        600KHZ – 3.6MHZ

HF  Inductor    100uH     Brown Black Brown Silver         1.3MHZ -7.9MHZ

VHF  Inductor      .39uH   Orange White Gold  Black         60MHZ -180MHZ  With on board 18pF capacitor in circuit.

If you want an amplifier for this board please go to it is listed in the shop and is also suitable for the Poldhu One Tube Radio.

Built and shipped from UK – dispatched air mail within 3 days. You will require a good earth connection to realise the best potential from this radio. A small screwdriver is required  to build the radio, no soldering required, the basic board is made up. 

This is a solderless kit. Components and links  are fitted to the board via the terminal block –  no soldering is required. The kit is ideal for new experimenters to crystal radio or for developing your own design. 

The kit includes everything you need to produce a crystal radio including the  ear piece and indoor aerial. The  kits can be broken down after use and rebuilt, so ideal for groups of students, after school clubs etc. 

A tested Iron Pyrites  “Cats Whisker” type detector is also included so you can compare with a modern germanium diode. The main assembled board has two variable capacitors and the phono socket fitted but extra capacitance can be introduced via the pads on the board. 

Four header pins and power terminal block  on the board can link the board with an amplifier .

A suitable amplifier lead and speaker can be bought seperatly and not included. 

Kit of Parts for Radio Evaluation Board

1 x Built Evaluation  board with Holder

Bag 1

1 x 1 metre earth wire

1 x crocodile clip

Bag 2

4 x inductors  1000uH 470uH  100uH .39uH

1x resistor

1x germanium diode

2 x Link wire

Bag 3


Bag 4

Cat,s Whisker and  Iron Pyrites crystal


1x crystal earpiece – tested


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