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Unijunction Transistor Circuits
Last Updated on: Friday, October 03, 2014 10:38 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

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