Electronic Component Kit for Starters and Beginners from ProTechTrader

jojo June 14, 2016 No Comments

Are you a beginner in Electronics wondering where to start? Well, we’ve all been there once like you, swimming on the shores not knowing where to go and wondering, “What’s the difference between resistance and capacitance?” or “Who is...
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Characteristics of a UJT

jojo September 17, 2009 5 Comments

UJT Characteristics The static emitter char­acteristic (a curve showing the relation between emitter voltage VE and emitter current IE) of a UJT at a given inter base voltage VBB is shown in figure.  From figure it is noted that...
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UJT-Uni Junction Transistors

jojo September 18, 2009 26 Comments

Unijunction transistor (abbreviated as UJT), also called the double-base diode is a 2-layer, 3-terminal solid-state (silicon) switching device. The device has-a unique characteristic that when it is triggered, its emitter current increases re generatively (due to negative resistance characteristic)...
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LASCR-Light Activated SCR

jojo September 17, 2009 2 Comments

Light activated SCR (LASCR) or a Photo SCR  is just an ordinary SCR except that it can also be light triggered. Most LASCRs also have a gate terminal for being triggered by an elec­trical pulse just as a conventional...
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Gate Turn Off Switch

jojo September 18, 2009 1 Comment

Gate turn-off switch (GTO) is, like an SCR, is a four layer, three junction semiconductor device with three external terminals, namely, the anode, the cathode and the gate, as illustrated in figure. The basic construction, schematic symbol of a...
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Silicon Unilateral Switch

jojo September 16, 2009 1 Comment

The diac and the silicon bilateral switch are grouped as bilateral or bidirectional devices because they can breakover in either direction. There are also breakover devices which breakover in only one direction; they fall in the category of unilateral...
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Silicon Bilateral Switch

jojo September 16, 2009 2 Comments

Silicon bilateral switch (SBS) is another breakover device which is capable of triggering triacs, and it is popular in low-voltage trigger control circuits. They have breakover voltages lower than those for diacs, ± 8 V being the most popular...
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Shockley Diode

jojo October 2, 2013 No Comments

To know more on the invention and history of the device click on this link – Shockley Diode – Invention History The four-layer diode, also called the Shockley diode after its inventor William Shockley, is essentially a low-current SCR without...
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SCS-Silicon Controlled Switch

jojo September 16, 2009 2 Comments

Silicon controlled switch (SCS), like the SCR, is a unilateral, four layer three junction P-N-P-N silicon device with four electrodes namely cathode C, cathode gate Gx, anode gate G2 and the anode A, as shown in figure. Infact, the...
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GCS-Gate Controlled Switch

jojo September 16, 2009 1 Comment

As mentioned earlier, low-current drop out is the normal way in which the SCR is turned off. Gate-controlled switch is designed for easy opening with a reverse-biased trigger. A gate controlled switch (GCS) is closed by a positive trigger...
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