Check the listing for details. (3) Rare UJT for making a Flasher, Oscillator, Sawtooth / ± Pulse Generator. Condition: New. Listed at 8.95 USD. --> 0813 Most purchases qualify for a ** Combined Shipping Discount ** Fast eMail Fast Shipping Guaranteed Good-on-Arrival Oddball "Transistor" a.k.a. Uni-Junction Transistor (UJT) Price is for (3) transistors. NOTE: Circuits are for example only and other parts are NOT included. 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 projecteers. These UJTs were manufactured by General Electric numbered "GE 5L507". 2N2647. --> A Google search will yield volumes of information on UJTs and their applications. Enjoy! Versatile, Multiple Waveform Generator Sawtooth, + Pulse, - Pulse Simpler than LM3909, LM555 Very Linear Ramp ( R2 > 10K ) Single Supply --> LED Blinky Flasher Draws only 1.5 mA as shown Works with All LEDs Increased CT = Brighter Flash Simpler than any other Flasher --> UJT-3 ************************************* ham radio etronic e-tronic hamtronic qba BootsParts USA boots PAYMENT and SHIPPING ** We offer a Combined Shipping Discount for most purchases (excluding books) if paid with ONE SINGLE PAYMENT with eBay's SHOPPING CART ** Condition of Goods Unless otherwise noted above: NOS (New Old Stock) or better, clean, unused 30 day Non-DOA, Good-on-Arrival Guarantee Untested, but NO JUNK or suspect parts PCB parts are thru-hole, NO SMD/SMT Small parts may be bulk packed Manufacturers and Date Codes may vary Attention International bidders only: Sorry, we ship to US ZIP Codes ONLY. We DO NOT ship Internationally. We ONLY ship to Registered US PayPal addresses. We DO NOT accept INTERNATIONAL PayPal payments. IMPORTANT: The parts we sell are categorized as new because they are unused, but many of our parts are those rare, hard-to-find, discontinued, manufacturing surplus and / or old stock commonly known in the parts business as 'NOS' (New Old Stock). Some of our stock pictures show date codes which may vary from the actual product shipped. Parts from a larger OEM package may be repacked for smaller lot size orders or for more practical handling and shipping. We strive to give full and accurate descriptions to earn your 5-Star Feedback. Any known deficiencies are listed in the detailed description. Datasheets are provided when available. Some datasheets may be close but not a perfect match because of part revisions or because they may be from a different manufacturer. If you have any questions concerning our products please email us before purchasing. Your complete satisfaction is important to us before and after the sale. Thank you.