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555 Pulse Width Modulator (Voltage Controlled Duty Cycle)

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555 Pulse Width Modulator (Voltage Controlled Duty Cycle)

Circuit Description

This is one variant of Pulse Width Modulator using the 555 timer. This circuit configures the 555 in monostable multivibrator mode periodically triggered by a rectangular signal. Control of the period of the monostable pulse is through the voltage applied to the timer's CONTROL pin. The 10 kOhm modulation resistor attenuates the modulating signal by a factor of 4. When the modulating signal is at 0 V, the control voltage is at one half the supply voltage (Vcc/2). For a +Vcc/-Vcc modulation signal the control voltage varies between Vcc/4 and 3Vcc/4. Currently the carrier signal is set to 87.5% duty cycle so that a narrow pulse (the remaining 12.5%) will be applied to the TRIGGER input of the 555. This prevents high frequency oscillation from occurring when the timing capacitor voltage is near the control voltage. When the carrier has a large space width, the true solution is to employ an RC differentiator in the TRIGGER input of 555. My objective is for this circuit to be opened and simulated in Free Subscription version of Multisim Live, due to Components per circuit limitation, I simply used the trick above to make the circuit work.

user-105504 says:

Another schematic with wrong pinouts.

1 year, 2 months ago

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Private Copy

Electronica Básica-UAC

1 Members

Creator

GGoodwin

1116 Circuits

Date Created

7 years, 7 months ago

Last Modified

7 years, 7 months ago

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555 Pulse Width Modulator (Voltage Controlled Duty Cycle)

Circuit Description

user-105504 says:

user-695530

RA2111003010429

Sundaresvar

antarasingh

Bolu1942

JoanSavallGirau

amysis

КГТУ

ec.zala

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