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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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24th May 2017, 6:17 am | #21 |
Nonode
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
Posts: 2,944
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Re: Varicap tuning
It would appear that the name “varicap” was first used by Pacific Semiconductors Inc., who released a range of such devices in 1958. There was a brief mention in Radio-Electronics for 1958 January, page 45. This was followed with a 3-page article “Using the Varicap” in the 1958 May issue, page 57ff.
These Radio-Electronics articles are available at: http://www.americanradiohistory.com/...aster_Page.htm. Cheers, |
25th May 2017, 8:05 am | #22 |
Hexode
Join Date: Oct 2010
Location: Box End, Beds. UK.
Posts: 271
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Re: Varicap tuning
I have been wondering for a while how well photodiodes would work as varicaps, obviously painted black to stop the light getting in. The point is, of course, that the area of the junction of some of them is vastly greater than most diodes, so that they capture more photons, so presumably have more capacitance. I am not thinking of the PIN photodiodes, of course. I must try it sometime when I have nothing else to do!
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25th May 2017, 9:20 am | #23 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Varicap tuning
Good idea. That's kind of the inverse of the old OC transistors i.e. remove the paint to add new and interesting features
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26th May 2017, 5:26 pm | #24 | |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
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Re: Varicap tuning
Quote:
Didn't do it on MW/LW. A new transistor was fitted. |
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