DATASHEET and Circuit Diagram

The diagram below circuits the piezo transducer which is used to trigger a 555 monostable circuit. Instead of triggering a monostable circuit, a piezo transducer commonly be used to trigger a thyristors.

When it is deformed, a piezo transducer will generate a voltage. If the piezo is tapped it will generate a small voltage, which is enough for triggering a circuit instead of the uncased piezo (which makes a good transducer).

The 556 timer is a dual version of the 555 single timer, they suitable for monostable or astable operation. It results in providing effective solutions for timing and pulse circuit applications.

The picture shows you with Tone Burst Generator Circuit Diagram using the 556 dual timer. It is connected as a one shot circuit. The pulse established by one shot turns on the oscillator allowing a burst of pulses to be generated.

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A sequential timer circuit device are used in many applications for initializing conditions during start-up or for activation of test signals in sequences such in test equipment device. The circuit diagram below shows a sequencer circuit with possible applications in many sistems.

As you can see, it uses the NE555 precision timer IC which capable of producing accurate time delays or oscillation. These timing circuits can be connected to provide such sequential control with various combinations of astable or monostable circuit connections. You can used it with or without modulation for extremely flexible waveform control.

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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 has 8 pinouts (ground, trigger, output, reset, +Vcc, discharge, threshold, control voltage). In the depth read of the datasheet, you will find explanations about LM555 monostable operation, multivibrator running mode, frequency divider, some waveform examples of pulse width modulator (PWM), pulse position modulator, linear ramp, and 50% duty cycle oscillator.

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The following NE555 datasheet includes another 555 Precision Timers series which is produced by Texas Instruments such NA555, SA555, and SE555. In the datasheet you can find application information for designing monostable operation, astable operation, missing-pulse detector, frequency divider, pulse-width modulation, pulse position modulation and sequential timer using the NE555 series with circuit diagram for each application.

The figure above shows you the NE555 Missing-Pulse Detector Circuit Diagram. According to the datasheet, this circuitry design can be used to detect a missing pulse or abnormality long spacing between consecutive pulses in a train of pulses. When the pulse spacing is less than the timing interval, the timing interval is retriggered continuously by the input pulse train.

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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 produces an output pulse of fixed duration each time the input circuit is triggered. As in the garage door example above, the monostable is triggered when the door is opened and turn the light on for duration of the output pulse. It can produce up to 200 mA output supply that is more than enough to drive LED or small loudspeaker.

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