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2N35 Projects


Sylvania introduced the NPN 2N35 in 1953 targeting it to hobbyists along with its PNP 2N34 and 1N34 diode. Being NPN, the 2N35 found home in many applications in complementary configurations with the then more popular PNP types. But there are numerous projects using it as the single or main transistor, aided by Sylvania publications and articles in magazines by authors as Lou Garner Jr.

2N35 fans usually started Sylvania's 28 Uses for Junction Transistors and other booklets at N4TRB's Semiconductor Documents Library.

After getting acquainted with 28 Uses, they, like other hobbyists, branched out adapting circuits from other sources.  Those working in the consumer-electronics service industry adapted circuits and techniques they found in Sylvania News.  See the American Radio History web site.

Sylvania fans later substituted the 2N229 for the 2N35.  The 2N229 was one of the better early transistors for shortwave projects up to 7 MHz (with selected 2N229s).  This range covers
the 160-meter (1.8-2 MHz) and 80-meter (3.5-4.0 MHz) amateur radio bands, the 5-MHz WWV NIST standards frequency and the popular 49-meter (6-MHz) international broadcast band (best in winter).  A 7-MHz converter might consist of a 2N229 as a radio-frequency amplifier, another 2N229 as a crystal-controlled local (converter) oscillator and a 1N82 as the mixer diode.  The type 1N82 could also be used as the detector in amplified diode receivers well into the UHF frequencies.

Popular Electronics' VHF T-Ear combines the 1N82 diode with a 2N35 and a CK722 transistor.  The full Popular Electronics, July, 1959 article is needed for coil-tapping data and other construction essentials.  The article may be obtained from American Radio History.  As usual read down the left-side fine print to find the wanted magazine.  Then select the desired issue.

Project Schematics

Sylvania 2N35 and 2N229 transistors may be purchased from the Transistor Museum Store.

For tips on receiver building, see this site's 2N107 Projects page.