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zapotsky asked Circuit building help, detection circuit?
I want to use an IR detector and emitter to detect the prescence of a model train. I need a circuit that after an impulse of electricity will turn on a light and keep it on until another impulse is sent. Can someone please link me to an easy circuit to build that can do this. (my 555 strobe circuit cause the chip to burst in to flames so i need something relievedly easy to build) I want a simple on off system, momentary pushbutton normally open, when you push it and let go i want a light to stay on, and only turn off if that button is pushed again momentarily
And got the following answer:
There seems to be two questions here. One is for a latch circuit for the momentary push button. This can use a flip flop such as a "D" type used to toggle each time it receives a clock pulse (from the IR switch for example). The output of the D type is the Q and the inverted Q. This needs a driver to operate a relay or lamp. D types also have direct action inputs for set or reset/clear, which could be a manual "reset" switch. Connect the Inverted Q output to the D input to get the toggle action (divide by 2). Typical D types are dual packages like the 74HC4013 which uses a 5V DC supply. The link below shows how to connect a lamp driver etc. The pulse used for the clock input needs to be "clean", just a single pulse that rises and falls sharply, so it would make sense to pass the output of the infrared detector through a simple series R and shunt C filter and a monostable (pulse generator) to guarantee this. A 555 can be used for the monostable function. It may be all you need. It just gives a pulse for the preset duration once triggered. This can be say 100ms for triggering the D type (in this situation) or a few seconds or more if it is OK to use it directly to light the lamp. The infrared detector needs an infrared source and a photo-diode, along with an amplifier/threshold detector for the photo-diode. An LDR does not work with IR wavelengths. The IR source can be an incandescent lamp or an IR LED, but the IR LED will be marginal for distances greater than about 25mm. The range can be improved by adding lenses to focus the beam.. The second link shows an example of a basic IR light switch using a particular op-amp. The detector is a phototransistor, but a photodiode is used the same way, but reverse connected. Other op-amps may be suitable but the circuit will need modifying to suit. This could use a 12V supply with little change other than to adjust the LED current. If the circuit drives a 555 monostable as discussed above the relay and relay driver are not necessary. Just use a 2.2K to 10K resistor to the trigger pin.. Why did your 555 blow up? This is a grossly wrong situation. Wrong power supply, it should be 5-12V DC in most uses.. Reversed power. The + goes to pin 8, and the - to pin 1.. Wrongly wired. Some gross external voltage connected to it incorrectly. See link three for more details.
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