Tag Archives: 555 IC

555 Timer Oscillator

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A voltage-controlled oscillator (VCO) using the timer 555 is shown in figure. 555-timer-voltage-controlled-oscillator The circuit is sometimes called a voltage-to-frequency converter because the output frequency can be changed by changing the input voltage. As discussed in previous blog posts, pin 5 terminal is voltage control terminal and its function is… Read more »

555 Timer as Monostable Multivibrator

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A monostable multivibrator (MMV) often called a one-shot multivibrator, is a pulse generator circuit in which the duration of the pulse is determined by the R-C network,connected externally to the 555 timer. In such a vibrator, one state of output is stable while the other is quasi-stable (unstable). For auto-triggering… Read more »

555 Timer as an Astable Multivibrator

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An astable multivibrator, often called a free-running multivibrator, is a rectangular-wave generating circuit. Unlike the monostable multivibrator, this circuit does not require any external trigger to change the state of the output, hence the name free-running. Before going to make the circuit, make sure your 555 IC is working. For… Read more »