Talk:Varicap

Electronics Mid‑importance

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As information to the authors of the article: the 2 diagrams with back-to-back varactors show them in the wrong direction. The DC control input should be connected to the cathode of both varactors so that they both receive a reverse bias. — Preceding unsigned comment added by 194.36.229.232 (talk) 14:18, 15 March 2024 (UTC)[reply]

I thought a NMOS transistor has two n+ implants sitting in an p-well, while a NMOS accumulation capacitor has two n+ implants sitting in a n-well. I will appreciate any clarifications about the terms used.

"Pn-junction in varicap when it's used reverse-biased(plain scheme).PNG"

Just note the plain picture I used for russian version of the article, which showed idea of how did varicap work... don't know if it's appropriate for english version. ellol 00:04, 30 April 2006 (UTC)[reply]

Thickness and Width

Width usually indicates a horizontal dimension. In the illustration [1], one sees that the depletion zone has both (horizontal) width and (vertical) thickness. Using width to describe the vertical dimension can be confusing to those not familiar with the artful use of the term 'width' in the books. Using the word 'thickness' avoids that confusion by being consistent with the orientation of the illustrations [2] and [3]. 24.26.128.185 (talk) 04:36, 16 February 2008 (UTC)[reply]

Re. 2N2222 and others

Hi, I noticed the comment. In my experience and many, many others the 2N2222 is especially good at this. I have also found that it sometimes has a lot more use if a lower gain spotted one, these were often discarded during production but Sinclair made a lot of money recycling these and other "seconds" for some radios.

Seems that low gain can be a sign of a good unit for varicap use. BC547 is also a common NPN transistor and also very cheap. — Preceding unsigned comment added by 185.3.100.45 (talk) 08:20, 30 September 2018 (UTC)[reply]

Wikipedia is not a how to guide. Glrx (talk) 01:29, 28 October 2018 (UTC)[reply]

Capacitance inversely proportional to

In the Wikipedia article, there are details indicating that the capacitance is inversely proportional to the square root of the applied reverse voltage. In other text sources, there is mention of the capacitance being inversely proportional to the applied voltage. So the big question is - which is it? Which is correct? KorgBoy (talk) 03:28, 2 April 2019 (UTC)[reply]