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Additional info for 110 Waveform Generator Projects for the Home Constructor
19. Gated 1 kHz astable: (a) 'press-to-turn-off, (b) 'press-to-turn-on' x a diode as indicated and eliminating Sx. In this case the circuit will gate off when the input signal voltage is reduced below /3 Vcc . 20b circuit is connected so that it is normally gated off by saturated transistor Qx, but can be gated on by closing Sx and thus 32 SOU A RE AND PULSE GENERA TORS turning the transistor off. This circuit can be gated electronically by eliminating/? 5 and Sx and applying a gating signal to the base of Qx via a 10 k£2 limiting resistor.
A xand A2 can, for example, be used to give trailing-edge OR logic triggering with input B used to give 'enable' or 'disable' action, or input B can be used to give leading-edge triggering with A xand A2 used to give 'enable' and 'disable' action. 5V + V E I N P U T PIN 5 + EV Q O U T P U)T ov + VE _ Ov Q OUTPUT (PIN 1 ) OV (a 5V +VE NPUT JUL §, OUTPUT ITT 6 OUTPUT Fig. 36. 37a to c show a number of alternative ways of obtaining desired pulse lengths from the device. c. has three externally-available timing-component terminals.
Alternative frequencies can be obtained by changing the Cx value. 2 circuit is suitable for use as a simple timebase generator for an oscilloscope. In this application the output of the circuit should be taken to the external timebase socket of the oscilloscope, and positive 'flyback' pulses from R6 can be taken via a high-voltage blocking capacitor and used for beam blanking. The generator can be synchronised to an external signal by feeding the external signal to Q2 via C2. This signal, which should have a peak amplitude of between 200 mV and 1 V, effectively modulates the supply voltage (and thus the triggering point) of Q2, thus causing Q2 to fire in synchrony with the external signal.