Wednesday, September 24, 2014
Triangular wave form Generator Circuit
A triangular waveform generator can Vi be made by using one amplifier of a LM3900N device as an integrator and another amplifier as a Schmitt trigger circuit.
A suitable circuit is shown, it has the unusual advantage that only the one power supply is required. When the output voltage from the Schmitt trigger circuit is low, the current flowing through Ra is integrated by C; to produce the negative slope of the triangular wave at output 1. When the output 2 voltage from the Schmitt trigger ls high, current flows through R; to produce the rising part of the waveform at output 1. The output waveform will have good symmetry if R1 = ZR;. The output frequency ls given bythe equation: f=V(+) - Vbe/2R1C1V Whel8 R1 = 2Rg, V35 ii the steady voltage at the inverting input (0.5 V) and V is the difference between the tripping points of the Schmitt trigger.
A suitable circuit is shown, it has the unusual advantage that only the one power supply is required. When the output voltage from the Schmitt trigger circuit is low, the current flowing through Ra is integrated by C; to produce the negative slope of the triangular wave at output 1. When the output 2 voltage from the Schmitt trigger ls high, current flows through R; to produce the rising part of the waveform at output 1. The output waveform will have good symmetry if R1 = ZR;. The output frequency ls given bythe equation: f=V(+) - Vbe/2R1C1V Whel8 R1 = 2Rg, V35 ii the steady voltage at the inverting input (0.5 V) and V is the difference between the tripping points of the Schmitt trigger.
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