350pF Air-Spaced Radio Tuning Capacitor with 34:1 Reduction Drive, Ormond 0.00035mF
$34.17
This is a used, single gang vintage 350pF air spaced variable tuning capacitor. The manufacturer is Ormond. The reduction drive system has an approximately 34:1 reduction ratio when turning the smaller 3.5mm diameter shaft. The larger part of the shaft is 6.0mm diameter. The plates are brass.
Here are some example projects where you could use such a part:
Crystal Set One
https://www.interestingelectronics.com/old/henrys_interesting_electronics/loud_crystal_set_radio/loud_crystal_set_radio.htm
Crystal Set Two
https://www.interestingelectronics.com/old/henrys_interesting_electronics/crystal_radio_v2/crystal_set_radio_v2.htm
Choccy Block Crystal Set Radio Kit
https://www.usefulcomponents.com/main_contents/projects/choccy_block_crystal_radio/choccy_block_crystal_radio.html
Tuned Loop Aerial
https://www.interestingelectronics.com/old/henrys_interesting_electronics/am_radio_loop_aerial_booster/mw_lw_am_loop_aerial_antenna.htm
Superheterodyne MW AM Radio
https://www.interestingelectronics.com/old/henrys_interesting_electronics/mediumwave_radio/mediumwave_radio.htm
The Ladybird Book "Learnabout... Making a Transistor Radio." Radio
https://www.interestingelectronics.com/old/henrys_interesting_electronics/ladybird_radio/ladybird_radio.htm
Breadboard Six Transistor MW AM Radio Kit
https://www.usefulcomponents.com/main_contents/projects/breadboard_trf_radio/breadboard_trf_radio.html
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