Pulse Generator Using Ujt Circuits

UJT Relaxation Oscillator consists of a UJT circuit with its emitter connected to a resistor and a capacitor. The timing of the output waveform is determined using the RC time constant. Supply voltage VBB is applied to the circuit. UJT Relaxation Oscillator can be used as a pulse generator when the voltage across the discharge resistor is used.

The first design below demonstrates a simple pulse generator circuit made up of a UJT oscillator such as 2N2420, Q1 and a silicon bipolar output transistor such as BC547, Q2. The UJT output voltage, obtained over the 47 ohm resistor R3, switches the bipolar transistor between a couple of thresholds saturation and cutoff, generating

The charging current in the second sawtooth generator circuit above could be changed, by a measure from 90 microamperes to 1 milliampere using the PERIOD potentiometer R5. This would result in a 0.01 microfarad timing capacitor producing a rates-of-rise of 9 volts per millisecond to 100 volts per millisecond.

Sawtooth wave generator circuit using UJT. Suitable to be applied in the field of music equipment and narrow pulse output. Also, we are able to be a random circuit and Hold. This circuit include of current variable power supply circuit T1, T2-BC557 and trigger N1, N2 of CD4011 and switch T3-BC547. When applying voltage to the circuit

Fig. 3 - Base connections of 2N2646 UJT. Fig. 4 - Wide-range pulse generator. Fig. 5 - Wide-range sawtooth generator. Fig. 6 - Linear sawtooth time-base generator. Thus, the circuit can be used as a pulse counter, frequency divider, or step-voltage generator for use in such applications as transistor curve tracers. Circuit operation is as

PULSE amp DIGITAL CIRCUITS LAB - 14AEC16 Objectives To familiarize student with 1. Generation and processing of sinusoidal and non-sinusoidal signals. 2. Fundamentals of basic logic gates and its applications. 3. Analysis and design of various multivibrator circuits. 4. Design and analysis of UJT relaxation oscillator and boot-strap sweep circuits

A one transistor pulse generator Note this inverts the pulse. This basic pulse generator circuit uses a differentiator to provide the pulse and then it uses a transistor to provide the pulses switching between virtually the rail voltage and 0V, while inverting the pulse. For this circuit, typically the value of R2 R1.

The firing circuit consists of a control circuit, a driver circuit, and a power circuit. The output of the pulse generator is fed to the pulse amplifier for amplification. Amplified pulses are given to the pulse transformer through shielded cables. This power dissipation in the gate circuit can be reduced by using a UJT in the firing

The Unijunction Transistor or UJT for short, is another solid state three terminal device that can be used in gate pulse, timing circuits and trigger generator applications to switch and control either thyristors and triac's for AC power control type applications.. Like diodes, unijunction transistors are constructed from separate P-type and N-type semiconductor materials forming a single

Working of UJT. The working of UJT can be understood by its equivalent circuit. The voltage applied at the emitter is indicated as V E and the internal resistances are indicated as R B1 and R B2 at bases 1 and 2 respectively. Both resistances present internally are together called as intrinsic resistance, indicated as R BB.The voltage across RB1 can be denoted as V 1.