Triangular wave generator

Different wave generator circuit is used troubleshoot electronics circuit. We have already published different type of wave generator. Now, Here is a circuit of advanced triangular wave generator for generating triangular wave with maximum peak level (VMAX) and minimum peak level (VMIN) in order to overcome the limitation of changing frequency with changing frequency with change in the value of generated waves.

triangular wave generator

Circuit descriptions of advanced triangle wave generator

The whole circuit of triangle wave generator is build around quad operational amplifier IC TL048 (IC2) and analogue multiplexer IC CD4053. IC1 is separated as A1, A2, A3 and A4 functioning as differential amplifier, integrator, buffer amplifier and comparator respectively.

The two reference voltage is given from analogue multiplexer to differential amplifier A1. The output voltage V1 = -(VMAX – VMIN) from A1 is given to A2 for integration. When the integrated output of A2 having positive slope it exceeds the level VMAX and the comparator output (output from A4) goes negative. Similarly, when the integrated output of A2 having negative slope comparator output (output from A4) goes positive.

Formula for calculation time period of oscillation of triangle wave generator

At time t1, output goes from the initial value VMIN to final value VMAX.

VMAX = VMIN + (V1/RC2).t1

Where R = VR3 + R5


t1 = VMAX – VMIN.RC2/V1

But the output of differential amplifier is Triangular wave generator

Therefore, t1 = RC2

At time t2, output goes from initial value VMAX to final value VMIN.

Therefore, VMIN = VMAX – (V1/RC2).t2

Therefore, t2 = (VMAX – VMIN).RC2/2

Again V1 = (VMAX - VMIN)

Therefore, t2 = RC2

From above calculation, time period of oscillation is

T = t1 + t2 = 2RC2

and is independent of the peak value set. The oscillation range is 50 Hz to 5 KHz.


Resistors (all ¼-watt, ± 5% Carbon)

R1, R2, R3, R4 = 10 KΩ

R5, R7, R8, R9, R10, R11 = 1 KΩ

R6 = 47 KΩ

VR1, VR2 = 10 KΩ

VR3 = 100 KΩ


C1, C2, C3 = 0.1 µF


IC1 = CD4053 (analogue multiplexer IC)

IC2 (A1, A2, A3 A4) = TL084 (quad operational amplifier)

D1 = 1N4148



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