Timer IC


The Monostable Operating Mode in 555 Timer IC Circuit, an Application Datasheet

There are basic modes operation in 555: Monostable, Astable (oscilatory), and Schmitt Trigger. The following application will discuss about Monostable Operating Mode in 555 Timer IC Circuitry since monostable mode are commonly useful in producing timing signal such on a light of automatic garage door openers. Accordingly, the monostable operation mode is a circuit that […]


National LM555 Datasheet, Replacement for SE555/NE555 Series and the Connection Diagram

The following LM555 Datasheet consist of informations about a highly stable device for generating accurate time delays or oscillation. As stated in the datasheet, this LM555 is direct replacement for SE555/NE555 since the LM555 has an additional terminals for desireable triggering or resetting. The illustration beside shows the top view of LM555 Connection Diagram which […]


555 Timer as Monostable Multivibrator

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 of output from quasi-stable state […]


555 Timer as an Astable Multivibrator

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 that go through the article: […]


555 Timer Oscillator

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 to control the threshold and […]