ࡱ> ,.+rn5@ bjbj22 DXX ,Ipppp ZZZ8,4 ^\(3555555$jRzYYpp nFp|(33B ZX7063L64"pppp6`YY    Electronics Latching Most of the circuits weve used so far turn on in response to a sensor, but then turn off again when the sensor input changes. Often we need the output to stay on. For a burglar alarm, we want the alarm to go on and then stay on until reset, or a certain time has passed. Here are some latching blocks. Thyristor Latching A thyristor is like a transistor but once switched on it will stay on. To turn it off you either have to disconnect the battery or short-circuit the thyristor output. Here is a thyristor latch:  SHAPE \* MERGEFORMAT   SHAPE \* MERGEFORMAT  When the left-hand switch is pressed, current is fed to the thyristor which turns on. This allows current to flow through the bulb. When the thyristor is short-circuited by pressing the right-hand switch, the circuit will turn off. A standard potential divider input block can be used in place of the left-hand switch, for example an LDR shown in the second circuit above. When the LDR is darkened, its resistance rises and so the voltage output of the potential divider also rises. This turns on the thyristor. It will then stay on until the reset switch is pressed. Here is the circuit on protoboard:  SHAPE \* MERGEFORMAT  Relay Latching A dpdt (double pole double throw) relay can be used as a latch by using one of the sets of contacts to keep the relay on once it has switched. You need a push-to-break switch so that you can reset the circuit later. The spare pair of relay contact can be used for any switching that you want to do.  SHAPE \* MERGEFORMAT  555 Bistable Latch The 555 chip is designed as a timer but can easily be used as the basis of a bistable latch. Here is the integrated circuit pinout and the circuit diagram:  SHAPE \* MERGEFORMAT  Build the circuit using protoboard according to the layout shown below.  Transistor Bistable Latch A bistable is a circuit with two stable states and uses two transistors. When one is on the other is off. They have two inputs that can be push switches or other sensors. Here is the circuit:  Quiz Circuit This circuit uses two thyristors; when one switches on the other cannot switch, so it makes an ideal quiz system. The question master must press the reset button after each answer. Build the circuit as shown and then see if you can add some sound to it.  FILENAME 7a Latching page  PAGE 3 k a g 10k 470R 1k TIC106 LDR 0v +9v RL 7 6 5 3 1 8 2 4 Top Switch 10k 10k 470R 470R Bottom Switch 0v +9v 555  EMBED CrocodileClipsCircuit   EMBED CrocodileClipsCircuit  560R Push switch c b e Push switch 100k Resistor Variable 100k Resistor Variable 560R c b e BC548 0v +9v K ^ ! " # $ ; < = > ? 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