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HISTORIC TRANSISTOR HOBBYIST SUPPLIES!
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Authentic
Supplies for the Transistor Historian and Kit Builder.
Available
Only from the TransistorMuseum™
All
Transistors Tested
Before
Shipment.
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Historical Background
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.
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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.
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2N489 – 2N494
VINTAGE UNIJUNCTION TRANSISTORS
N-Type Silicon Bar
Unijunction Transistors
Vintage
1950s –1960s
Use:
Timing/Waveforms
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Your TransistorMuseum™
2N489-2N494
Order Will Contain:
One
Tested Unijunction Transistor
(Style Shown Above)
Hobbyist
Insert Depicting the Historical Importance of this Unique Semiconductor
Device, Includes a Schematic Using the Vintage Unijunction in a Relaxation
Oscillator - LED Flashing Circuit.
A
TransistorMuseum™ Classic
Semiconductor
Storage
and Display Envelope
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ORDER NOW
$10 per Package (One Transistor)
Includes
Shipping Within U.S.
Email
me at
transistormuseum@aol.com
To
Determine Payments Options
(Paypal
or Check)
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COPYRIGHT © 2005
By Jack Ward
All Rights
Reserved.
http://www.transistormuseum.com
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