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Extra info for 110 Waveform Generator Projects for the Home Constructor
5. 100 Hz to 1 kHz linear triangle generator with the component values shown. The frequency range can readily be extended by using alternative values of Cx. 5 circuit is made up of two sections, these being an integrator (ICX) and a differential voltage comparator switch (IC2). The integrating network, which is built around ICX, comprises R3 —R4 and C\, and is driven from variable potential divider/?! —R2, which in turn is driven from the output of voltage switch IC2. The triggering level of IC2 is determined by the ratios of Rn and Rs.
28. H e r e , / ? 3 a n d R 4 are wired as an adjustable potential divider across the supply lines, and the circuit's main timing resistor (series combination Rx and R2) is connected between timing capacitor Cx and the slider of R4. c. to another. The performance of this 'compensatable' circuit can thus be made independent of the CD 4001 characteristics. Note that the circuit must be used with a stabilised power supply, since the pulse length is influenced by supply variations. 27 circuits are not suitable for commercial manufacture is that the periods of their monostable pulses are influenced by as much as 20 per cent by the shapes and frequencies of their input trigger signals.
One of the most basic of all triggered pulse-generator circuits is the transistor monostable multivibrator. 21a shows the practical circuit of a manually triggered generator of this type. In this circuit Qi is normally cut off, Q2 is driven to saturation via Rx, and Cx is fully charged. When Si is momentarily closed, a regenerative switching action is initiated in which Qt is driven to saturation and Q2 is driven off by the resulting negative-going charge of Cx. As soon as this regenerative action is complete, Cx starts to discharge via Rx, until eventually its charge falls to such a value that Q2 starts to turn on again, at which point a second regenerative action is initiated in which the transistors revert to their original states and the action is complete.
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