By R.M. Marston
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Extra info for 110 Waveform Generator Projects for the Home Constructor
Circuit produces non-linear sawtooth waveform SYNC INPUT C 2 (SEE TEXT) 12V + V E (STABILISED) BEAM BLANKING OUTPUT R < 1 2 k2Q > OV Fig. 2. t. 2. This circuit can be used as an oscilloscope timebase. Here, Q\ is used as a temperature-compensated constant-current generator, with current variable over the approximate range 35 / / A to 390 JUA via R3. The linear sawtooth of C\ is available externally via 56 TRIANGLE, RAMP AND SAWTOOTH GENERA TORS potentiometer R 7and buffer transistors Q3 - £ ? 4.
Most times, the M/S ratio of the output will be within the range 5 : 4 to 4 : 5. 5V t o 15V * v e •100k f^600Hz M / S R A T I O = 1/11 t o I l / l IC,=CD4001 2 :R : iMfi 3 :R > inn L - - • T O PINS 8,9, 12 A N D 13 OV *D, AND D = LOW-LEAKAGE 2 SILICON DIODES. Fig. 14. 12b. This particular circuit covers the frequency range 600 Hz to 6 kHz. The basic COS/MOS astable circuit can be usefully modified in a number of ways. 13a. c. 13b. Here, highvalue resistor R2 is simply wired in series with the input of gate A.
A variety of practical waveform generators of all three types are described in this chapter. T. ) is a special-purpose device that is particularly suitable for generating sawtooth waveforms. t. circuit that produces a non-linear sawtooth waveform. t. turns on and rapidly discharges Cx. t. turns off again, Cx starts to recharge via Rx -R2, and so the sequence repeats ad infinitum. 1 circuit, and this sawtooth can be fed t o external circuits via potentiometer Rs and buffer transistors Q2 -Q3. i • The operating frequency 54 TRIANGLE, RAMP AND SAWTOOTH GENERA TORS 55 can be varied from less than one cycle per minute to over 100 kHz by changing the Cx value.
110 Waveform Generator Projects for the Home Constructor by R.M. Marston