UJT FIRING CIRCUIT PDF

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Is it possible to replicate a random pattern of trigger and charge times to an UJT firing circuit for an SCR configuration? What I mean is that, UJTs usually have a periodic sequence to them. Charging and discharging of the capacitor connected between its E and B1 terminals occurs in a periodic fashion.

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Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Is it possible to replicate a random pattern of trigger and charge times to an UJT firing circuit for an SCR configuration? What I mean is that, UJTs usually have a periodic sequence to them. Charging and discharging of the capacitor connected between its E and B1 terminals occurs in a periodic fashion.

Now, say the power supply is about 5V and I assigned this the binary value 1 and the binary value 0 to 0V. Since charging and discharging happens in a regular periodic fashion say, Is there a way that a UJT firing circuit can be configured in order for the charging and discharging to occur in say an irregular un-smooth fashion like ? What I'm asking is if it's possible to redesign this circuit:. Then can a circuit be designed to produce a firing scheme such as that repeats itself instead of that repeats after every ??

So that if you zoom the waveform out, then you can see that repeating pattern though it's not as smooth and nice as the regular sequence. Since there are no random components in that circuit and it is fed from a constant DC supply it should perform exactly the same on each cycle. If you want random firing you need to introduce some further circuit elements.

Given that you're probably looking for low frequencies you could use a small micro or a pseudo-random sequence generator. Figure 1. Sign up to join this community.

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Viewed 8k times. What I'm asking is if it's possible to redesign this circuit: so that it can produce an irregular waveform. Please provide a schematic there's a button on the editor toolbar and explain what you are trying to achieve. Active Oldest Votes. Transistor Transistor k 9 9 gold badges silver badges bronze badges. You need to edit your question and explain what you really want.

Can any sequence of this charging and discharging be replicated, that is with repeating pattern, say , or , instead of the regular clock like sequence ? Once you use a micro you can program it to do whatever you like. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast JavaScript is ready to get its own place. Featured on Meta. What posts should be escalated to staff using [status-review], and how do I….

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SCR Triggering using UJT

Unijunction transistor: Although a unijunction transistor is not a thyristor, this device can trigger larger thyristors with a pulse at base B1. A unijunction transistor is composed of a bar of N-type silicon having a P-type connection in the middle. See Figure a. The connections at the ends of the bar are known as bases B1 and B2; the P-type mid-point is the emitter.

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The Unijunction Transistor (UJT)

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