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Item:( QTY 4 ) UJT Osc, Sawtooth/ ± Pulse Generator, Flasher

( QTY 4 ) UJT Osc, Sawtooth/ ± Pulse Generator, Flasher

Item condition:--
Ended:Nov 15, 200920:53:29 PST
Bid history:0 bids
Starting bid:US $9.00
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Price:US $9.95
Shipping:$2.95US Postal Service First Class MailSee more services 

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Other item info
Item number:350273556628
Item location:South Central, United States
Ships to:United States
Payments:
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0905

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Oddball "Transistor"
a.k.a. Uni-Junction Transistor (UJT)
Auction is for (4) transistors.

APPLICATIONS:

  • SIMPLE LED Flasher
  • Sawtooth / Ramp Generator
  • Positive Pulse Generator
  • Negative Pulse Generator
  • Relaxation Oscillator
  • Only 3 Leads in a TO-92 Package
Please, don't let the name "transistor" confuse you. This is a rare, unique, even oddball but fun device for any experimenter who takes the time to explore it's properties. They don't make these any longer and our stock is limited.

Actually, the UJT doesn't work anything like a conventional bipolar transistor. It doesn't even have the same junction configuration. The UJT has two bases with an emitter in between. And it has no collector. The UJT is actually a Negative-Resistance device that can be used as an oscillator, much like a Tunnel Diode.

NOTE: The circuits shown below are suggested applications. This auction is for (4) UJT Transistors only. The other components are NOT included.

The UJT enjoyed popularity after it's introduction in the late '50s, particularly for firing SCRs. But with the introduction of DIP8 timer chips, the UJT has all but disappeared from sight. Nevertheless, the sheer simpicity, even compared to the LM555 or LM3909, makes them perfect for exploration by curious experimenters.

These UJTs were manufactured by General Electric numbered "GE 5L507". A Google search will yield volumes of information on UJTs and their applications. Enjoy!


Versatile, Multiple
Waveform Generator
  • Sawtooth, + Pulse, - Pulse
  • Very Linear Ramp ( R2 > 10K )
  • Simpler than LM3909, LM555
  • Single Supply


LED Blinky
Flasher
  • Only 1.5 mA as shown
  • Works with All LEDs
  • Simpler than any other Flasher
  • Increased CT = brighter flash

UJT-4

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PCB parts are thru-hole, NO SMD/SMT
Small parts may be bulk shipped
Manufacturers may vary from picture
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Item location: South Central, United States
Shipping to: United States
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Estimated delivery*
US $2.95
United States
US Postal Service First Class Mail®
4-7 business days
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*The estimated delivery time is based on the seller's handling time, the shipping service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
Domestic handling time
Will usually ship within 2 business days of receiving cleared payment.
Return policy
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Refund will be given as
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7 days after the buyer receives it
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Please email us your payment method and shipping address in 3 days. Pay in 10 days. A Shipping & Handling discount is available for most auctions won over 5 days if paid with ONE PAYMENT. (Books and pre-packed items are excluded). We request you delay payment until all eligible auctions have ended and then email us for a combined invoice. Items usually ship next business day after payment (checks clear). Thank you for bidding
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