HISTORIC TRANSISTOR HOBBYIST SUPPLIES!
Supplies for the Transistor Historian and Kit Builder.
Only from the TransistorMuseum™
Originally known as the
“double-base diode”, the unijunction transistor was invented at the General
Electric Electronics Lab in Syracuse in the early 1950s. This unique, single “pn” junction device
became a very big seller for GE in the late 1950s and into the 1960s. The
first high volume commercial unijunction product line was labeled as 2N489
– 2N494, with each of these different types selected for specific switching
characteristics. Motorola and TI
were second source suppliers for unijunction transistors, with improved
devices available even today using a variety of model numbers.
The unijunction transistor exhibits
a performance characteristic known as negative resistance, which
contributes to the usefulness of this device in switching and timing circuits
that require a minimum number of additional components.
Your 2N489 – 2N494 Transistor
Order Will be Supplied in the Storage/Display Envelope Shown Above, which
Includes an Insert with Historical Description
and a Schematic.
2N489 – 2N494
VINTAGE UNIJUNCTION TRANSISTORS
N-Type Silicon Bar
Order Will Contain:
Tested Unijunction Transistor
(Style Shown Above)
Insert Depicting the Historical Importance of this Unique Semiconductor
Device, Includes a Schematic Using the Vintage Unijunction in a Relaxation
Oscillator - LED Flashing Circuit.
and Display Envelope
$10 per Package (One Transistor)
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COPYRIGHT © 2005
By Jack Ward