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NE556V Datasheet(PDF) 10 Page - Texas Instruments |
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NE556V Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page B B B R D = R R 2 1 2 + o A A f R R C 1 2 1.44 (( 2 ) ) = + 1 2 3 4 5 6 7 14 13 12 11 10 9 8 LM556 Vout Vin 0.01 µF 10 µF 100 µF 0.01 µF 0.01 µF R2A R1A R1B R2B LM556 SNAS549A – MARCH 2000 – REVISED OCTOBER 2015 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The LM556 timer can be used in various configurations. A typical application for the LM556 timer in astable mode is to drive an audio device (such as a beeper) to provide a pulsed sound. This simple application can be modified to fit any application requirement. 8.2 Typical Application Figure 13. Typical Application 8.2.1 Design Requirements The main design requirements for this application require setting one of the timers (Timer A in this case) to the same resonant frequency as the piezo transducer which can be set by choosing R1A, R2A, and CA with Equation 1: (1) The other design choice is to decide how often and long to produce the bleeping sound. This can be set by choosing R1B and R2B of Timer B (acts as the reset button for Timer A) with Equation 2: (2) Other useful design equations like Equation 3 and Equation 4 are given below where th represents the time it takes to charge the capacitor of each individual timer and tl represents the time it takes to discharge the capacitor. 10 Submit Documentation Feedback Copyright © 2000–2015, Texas Instruments Incorporated Product Folder Links: LM556 |
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