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Sagot Gulaman asked 555 electronic RS flip flop resetting automatically?
I built this electronic laser alarm circuit: http://img717.imageshack.us/i/sche.png correction: ten ohm resistor between pin 3 and transistors instead of wire link. It works, but the flip flop resets automatically after a certain time without the switch How can I fix this? Iam a engineering hobbyist only. Nothing professional.
And got the following answer:
The circuit looks like a bistable flip flop. The first problem is the transistor in the input trigger circuit (connected to pin 2) shorts out the power supply when it is on at present. It should have a resistor between the collector and the supply. This will then change state when a positive trigger pulse is received at the base. First time on, second time off etc.. When the light is off the base voltage and current rises sufficiently and turns the trigger transistor on, which pulls pin 2 from 5V to 0V, which triggers the operation. The 555 triggers when pin 2 is < 1/3 of the 5V so < 1.67V. See the link below for a bistable circuit like yours. Replace the trigger switch with your input trigger transistor. While this will work, the triggering is not based on the 555 trigger threshold but the transistor's "threshold" which is about 0.7V. A better circuit connects the LDR directly to pin 2, replacing the trigger switch in the link. The device triggers when the light exceeds a certain level. As this is a bistable, removing the transistor which inverts the signal just reverses the order of the sequence. Rewiring the relay contacts makes it on or off as you desire. If you want the relay on when the light is there and off when there is no light use the "schmitt trigger" configuration. This is not a bistable, just on or off when the threshold is exceeded. It defines the threshold properly though. The on or off trigger state (light or not light is the trigger) can be swapped by swapping the LDR and the resistor positions in the circuit. The resistor driving the transistors in the output (pin 3) should be more like 470 ohms not 10 ohms. There should be a separate resistor from pin 3 to each of the transistor bases if you want to connect them in parallel like that. Maybe there should be a 1 ohm resitor between the emitter and ground too, to help with current sharing. It should only need one transistor if it is turned on properly (enough base current to be almost 0Vcollector to emitter) as it is rated at 200mA. I expect the relay needs less than that. The current in the base circuit should be >1/30 of the relay current. If the relay is more than say 180mA (relay R < 27 ohms) then two transistors will be needed as described. The power supply has to supply 5V at more than the relay current + a few mA. It is very likely the transistors are damaged. The 555 may also be damaged. Have fun.