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NE555 Datasheet(PDF) 9 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

Part No. NE555
Description  PRECISION TIMERS
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Manufacturer  ARTSCHIP [ARTSCHIP ELECTRONICS CO.,LMITED.]
Direct Link  http://www.artschip.com/
Logo ARTSCHIP - ARTSCHIP ELECTRONICS CO.,LMITED.

NE555 Datasheet(HTML) 9 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

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NE555,SA555,SE555
PRECISION TIMERS
www.artschip.com
9
APPLICATION INFORMATION
Pin numbers shown are for the D, JG, P, PS, and PW packages.
Note A: The modulating signal can be direct or capacitively
coupled to CONT. For direct coupling, the effects of
modulation source voltage and impedance on the bias
of the timer should be considered.
Figure 18. Circuit for Pulse-Width Modulation
Time – 0.5ms/div
Figure 19. Pulse-Width-Modulation Waveforms
Pulse-position modulation
As shown in Figure 20, any of these timers can be used as a pulse-position modulator. This application modulates the threshold
voltage and, thereby, the time delay, of a free-running oscillator. Figure 21 shows a triangular-wave modulation signal for such a
circuit; however, any wave shape could be used.
Pin numbers shown are for the D, JG, P, PS, and PW packages.
NOTE A: The modulating signal can be direct or capacitively
coupled to CONT. For direct coupling, the effects of modulation
source voltage and impedance on the bias of the timer should
be considered.
Figure 20. Circuit for Pulse-Position Modulation
Time – 0.1 ms/div
Figure 21. Pulse – Position – Modulation Waveforms


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