Audio-Visual Multiband VLF receiver (3Hz - 300kHz)

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Micro 40 DSB

 

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RX Superheterodyne SSB multiband

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0V2

 

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RX CW SSB 160 - 10m

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DKM-302

 

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QRP transceiver DSB, 80m

 

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ARDF 80m

 

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K174XA2 = TCA440 = A244D: datasheet

Three-band direct conversion receiver

 

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Crystal radio

    Most electronics enthusiasts started with this diagram.

    Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of wire, a capacitor, a crystal detector and earphones (>2000 ohms).

Crystal radio made by Radiola (1922)

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