Cost-effective Electronic Construction by John Watson

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This general principle can be used for synchronising all sorts of items of machinery, either in 'real time', or by recording on tape . Computer Operation Finally, the strobe can be triggered directly by the input/output port described in chapter 10! Simply connect the opto-coupler LED anode to the +5 V supply rail, and take the cathode to one of the output port lines via a 220 n resistor . The strobe will fire when the port line changes from logic 1 to logic 0, so the port line should normally be at logic 1.

And of course, the circuit is live to the mains, so take care to insulate everything properly . layout is uncritical, except that you should make the trigger connection between the coil and trigger electrode of the xenon tube short and well-insulated . 15 in. pitch should be used, as the wider spacing between the lands pro vides better insulation . 1 in. pitch was used for the opto-coupler socket. As the 5 kV or so of the tr igger coil will jump 2-3 mm, it is essential to remove the copper strips around the high-voltage connection to the trigger coil.

A 7-segment display would appear as a blur of figures until the counting stopped. The counter can , if you require it, be preceded by an amplifier stage . The circuit used as an amplifier for the xenon strobe in chapter 7 can be used here as well. This could enable the circuit to count tape pulses, for example , or any other low-level signals . I have not given any circuit layouts in this chapter -- the circuits involved are very simple, and it will be good practice designing Veroboard layouts for them!

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