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1929 style ham transmitter, rear view.

Home made radio.

3ワット モノラルアンプの画像:オーディオ大好きおやじの日記

A Truly Radio-Active Vehicle

電鍵 – Telegraph key - JapaneseClass.jp

ピンもと:Make: DIY Projects and Ideas for Makers

Lovely junk-built crystal radio

ラジオのもの,鉱石ラジオ,ラジオ,Chrytal Radio,Radio Punk,Diy Radio,Radio Sets,Crystal Radio Plus,Built Crystal

ピンもと:Make: DIY Projects and Ideas for Makers

Altoids Tin Radio

MAKE | Altoids Tin Radio

It uses a very high Q Spider Coil. The coil is wound with 660/46 Litz and the Q is in excess of 1000, too high to measure on my HP 4342A Q Meter. The radio has only one tuned circuit, the spider coil using a "Holy Grail" silver and ceramic variable capacitor. The antenna is coupled to the spider coil with the smaller non-resonant spider coil. This coil does not resonate anywhere in the broadcast band, if it it did it would try to inject stations at its resonant point.