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2. Emitter-coupled logic - Wikipedia

   en.wikipedia.org/wiki/Emitter-coupled_logic

   Note the Q5 and Q6 emitters coupled to the output. In electronics, emitter-coupled logic ( ECL ) is a high-speed integrated circuit bipolar transistor logic family . ECL uses an overdriven bipolar junction transistor (BJT) differential amplifier with single-ended input and limited emitter current to avoid the saturated (fully on) region of ...

3. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   In an organic light-emitting diode , the electroluminescent material composing the emissive layer of the diode is an organic compound. The organic material is electrically conductive due to the delocalization of pi electrons caused by conjugation over all or part of the molecule, and the material therefore functions as an organic semiconductor ...

4. Blocking oscillator - Wikipedia

   en.wikipedia.org/wiki/Blocking_oscillator

   Control voltage (or current) to the switch is now free to "flow" into the control input and close the switch. This is easier to see when a capacitor "commutates" the control voltage or current; the ringing oscillation carries the control voltage or current from negative (switch open) through 0 to positive (switch closed).

5. Bipolar junction transistor - Wikipedia

   en.wikipedia.org/wiki/Bipolar_junction_transistor

   The collector–emitter current can be viewed as being controlled by the base–emitter current (current control), or by the base–emitter voltage (voltage control). These views are related by the current–voltage relation of the base–emitter junction, which is the usual exponential current–voltage curve of a p–n junction (diode). [3]

6. Common collector - Wikipedia

   en.wikipedia.org/wiki/Common_collector

   The circuit can be explained by viewing the transistor as being under the control of negative feedback. From this viewpoint, a common-collector stage (Fig. 1) is an amplifier with full series negative feedback. In this configuration (Fig. 2 with β = 1), the entire output voltage V out is placed contrary and in series with the input voltage V in.

7. Semiconductor device - Wikipedia

   en.wikipedia.org/wiki/Semiconductor_device

   A semiconductor diode is a device typically made from a single ... This creates a much larger current between the collector and emitter, controlled by the base ...

8. Unijunction transistor - Wikipedia

   en.wikipedia.org/wiki/Unijunction_transistor

   The schematic diagram symbol for a unijunction transistor represents the emitter lead with an arrow, showing the direction of conventional current when the emitter-base junction is conducting a current. A complementary UJT uses a p-type base and an n-type emitter, and operates the same as the n-type base device but with all voltage polarities ...

9. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   Light-emitting diodes (LEDs) produce light (or infrared radiation) by the recombination of electrons and electron holes in a semiconductor, a process called "electroluminescence". The wavelength of the light produced depends on the energy band gap of the semiconductors used.