UJT firing circuits for SCR

Question

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, 1001001001... 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 0010110011110?

Here's a website that describes how a UJT firing scheme works: http://www.electronics-tutorials.ws/power/unijunction-transistor.html

As you can see, the $$V_{R2}$$ waveform is regular and periodic. What I'm asking is if it's possible to redesign this circuit:

so that it can produce an irregular waveform. Assuming that the high values of$$V_{R2}$$ and $$V_{ON}$$ are 1 and the low values $$V_{R2}=0$$ and $$V_{OFF}$$ are 0. Then can a circuit be designed to produce a firing scheme such as 0010110011110 that repeats itself instead of 1001001001 that repeats after every 100?? 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 100100100 sequence.

Answer 1

No. 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. From Clabacchio's answer to https://electronics.stackexchange.com/questions/30521/random-bit-sequence-using-verilog.