Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 30,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 

Unijunction Transistor Circuits
Last Updated on: Tuesday, April 01, 2014 04:30 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Poor Man's Frequency Converter for a squirrel Motor -  The idea is opposite of typical motor frequency converter where the main voltage is first rectified and later chopped to a variable frequency. Outputting voltage must be in proportion of frequency. The lower the frequency the lower the voltage must be.  This simple circuit is operating as a cycloconverter. It picks every 3th half wave....(added 02/05)
Silicon Controlled Rectifier Model Railroad Throttles & London Model Railroad Group SCR Throttle -  The following is a schematic drawing of a Silicon Controlled Rectifier type throttle for use on larger scale model railroads. Three versions of this throttle are shown on this page. They are not sophisticated designs but work well and are tough and reliable. [from Rob Paisley's Model Train web site]
UJT Test -  This testing procedure is for use with a digital multimeter in the OHM's test-range.  The UJT is a solid-state 3-terminal (TO-18 case) emiconductor.  UJT's are used in pulse/timing, oscillator, sensing, and thyristor triggering circuits. The most common one being probably the 2N2646 from Motorola…. [Tony van Roon's circuit]

Unijunction Transistor -  The unijunction transistor (UJT) is a three terminal device with characteristics very different from the conventional 2 junction, bipolar transistor. It is a pulse generator with the trigger or control signal applied at the emitter .  This trigger voltage is a fraction (n) of interbase voltage, Vbb. The UJT circuit symbol, junction schematic, and characteristic curve are....(app note added 02/05)

Unijunction Transistor Circuits


HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Contact Info


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2013 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.