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Launchpad

Launchpad. P1.1 attached to touch screen top P1.2 attached to touch screen right. But…. P1.1 and P1.2 attached to J3. Multivibrators and wave shaping circuits. Multivibrators. Bistable Monostable (one shot) Astable. Monostable multivibrator. Schmitt Trigger (voltage output).

eugenia-parsons
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Launchpad

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  1. Launchpad P1.1 attached to touch screen top P1.2 attached to touch screen right

  2. But… P1.1 and P1.2 attached to J3

  3. Multivibrators and wave shaping circuits

  4. Multivibrators • Bistable • Monostable (one shot) • Astable

  5. Monostablemultivibrator

  6. Schmitt Trigger (voltage output) Figure 13.19 (a) The bistable circuit of Fig. 13.17 with the negative input terminal of the op amp disconnected from ground and connected to an input signal vI. (b) The transfer characteristic of the circuit in (a) for increasing vI. (c) The transfer characteristic for decreasing vI. (d) The complete transfer characteristics.

  7. Relaxation Oscillator, astablemultivibrator Figure 13.24 (a) Connecting a bistable multivibrator with inverting transfer characteristics in a feedback loop with an RC circuit results in a square-wave generator.

  8. Relaxation Oscillator Figure 13.24 (Continued) (b) The circuit obtained when the bistablemultivibrator is implemented with the circuit of Fig. 13.19(a). (c) Waveforms at various nodes of the circuit in (b). This circuit is called an astablemultivibrator.

  9. Output Limiting Figure 13.23 Limiter circuits are used to obtain more precise output levels for the bistable circuit. In both circuits the value of R should be chosen to yield the current required for the proper operation of the zener diodes. (a) For this circuit L+ = VZ1 + VD and L– = –(VZ2 + VD), where VD is the forward diode drop. (b) For this circuit L+ = VZ + VD1 + VD2 and L– = –(VZ + VD3 + VD4).

  10. 555 Timer Figure 13.27 A block diagram representation of the internal circuit of the 555 integrated-circuit timer.

  11. Astable Figure 13.29 (a) The 555 timer connected to implement an astable multivibrator. (b) Waveforms of the circuit in (a).

  12. Monostable Vcontrol , varies width Figure 13.28 (a) The 555 timer connected to implement a monostable multivibrator. (b) Waveforms of the circuit in (a).

  13. Variable voltage

  14. Figure 13.31 (a) A three-segment sine-wave shaper. (b) The input triangular waveform and the output approximately sinusoidal waveform.

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