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How do I change the duty cycle of an oscillator?
Charge the capacitor faster (or slower) than you discharge it. Now, when discharging (Vout low), D1 conducts putting R1 and R2 in parallel. This will reduce the period, but also increase the duty cycle (by decreasing the low period). If you wanted to reduce teh duty cycle, reverse the diode.
What is the voltage limit of capacitor in relaxation oscillator?
At the instant the capacitor falls to a sufficiently low value (e.g., 1/3 of the power supply voltage), the switch flips to let the capacitor charge up again. The popular 555’s comparator design permits accurate operation with any supply from 5 to 15 volts or even wider.
Which type of feedback is used by Colpitts oscillator?
Voltage series feedback
Which type of feedback is used by Colpitts oscillator? Solution: Voltage series feedback is used in Colpitts oscillator. In voltage series feedback a part of output voltage is fed back to input.
How is the period of a relaxation oscillator determined?
The period of a relaxation oscillator is mainly determined by the relaxation time constant. Relaxation oscillations are a type of limit cycle and are studied in nonlinear control theory.
Who was the inventor of the relaxation oscillator?
The first relaxation oscillator circuit, the astable multivibrator, was invented by Henri Abraham and Eugene Bloch using vacuum tubes during World War I. Balthasar van der Pol first distinguished relaxation oscillations from harmonic oscillations, originated the term “relaxation oscillator”,…
Why is a relaxation oscillator called a hysteretic trigger?
This relaxation oscillator is a hysteretic oscillator, named this way because of the hysteresis created by the positive feedback loop implemented with the comparator (similar to an operational amplifier ). A circuit that implements this form of hysteretic switching is known as a Schmitt trigger. Alone, the trigger is a bistable multivibrator.
What was the purpose of a vacuum tube oscillator?
During the vacuum tube era they were used as oscillators in electronic organs and horizontal deflection circuits and time bases for CRT oscilloscopes; one of the most common was the Miller integrator circuit invented by Alan Blumlein, which used vacuum tubes as a constant current source to produce a very linear ramp.