Semiconductors

Download 110 Waveform Generator Projects for the Home Constructor by R.M. Marston PDF

By R.M. Marston

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Extra resources for 110 Waveform Generator Projects for the Home Constructor

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13a. c. 13b. Here, highvalue resistor R2 is simply wired in series with the input of gate A. e. characteristics on the final circuit performance, and so enhances the circuit's thermal stability and improves the symmetry of the output waveform. 13c. e. is simply wired in series with the output of the astable circuit. This gate acts as an output buffer, and sharpens up the shape of the final output waveform and minimises the effects of varying output loads on the circuit's operating frequency. 14 shows how the basic circuit can be modified so that it produces a variable mark/space ratio output.

13b. Here, highvalue resistor R2 is simply wired in series with the input of gate A. e. characteristics on the final circuit performance, and so enhances the circuit's thermal stability and improves the symmetry of the output waveform. 13c. e. is simply wired in series with the output of the astable circuit. This gate acts as an output buffer, and sharpens up the shape of the final output waveform and minimises the effects of varying output loads on the circuit's operating frequency. 14 shows how the basic circuit can be modified so that it produces a variable mark/space ratio output.

The 61 6 V + 15V + V E 2-2kO3 R Ra« 22kO/ OV C«. 1 /; F R . | 1 0 k5 O< SOUARE ^ WAVE TRIGGER INPUT I Re' 10kO Ldi ~ srH q 8-PIN D l i p 555 TIMER -C A 5th •001 j / F Qi 2N3704 2N3704 Ci •01j/F Ci V A L U E SAWTOOTH PERIOD 10/yF 1 A/F 0-1 / y F •01 / / F •001/yF 9 0 ms 9 ms 0-9 m s 90/vs 9//s - 7 U (SEE TABLE) 1-2 120 12 1•2 120 RANGE OUTPUT < f o k j ? J\ (LEVEL) _ +VE (I OV ov sec ms ms ms //s Fig. 7. L 555 TIMER P 5Pn Q 2 2N370A c2_ •01/yF| 10kQ (LEVEL) Fig. 8.

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