I have need of a relatively simple circuit that will achieve the following.
I intend to have 3 separate independant inputs (ie. LED/Phototransistor Interruptor).
If any single Phototransistor is triggered, a DPDT Relay changes state. (ie. if it's ON it turns OFF, if OFF it turns ON).
There must be a delay of approx 5-10 seconds between the Trigger Input and the Relay change of state.
At present I have a Model Railway with 3 tracks, (think of a Y). The Loco can move to all 3 legs of the 'Y' and is controlled by a simple 555 timer which changes Track Polarity. One of the arms of the 'Y' is about 1.5 Metres long and this determines the Timer setting. However, the other 2 legs of the 'Y' are only 300mm long and the delay before Polarity change is unacceptable. I have automatic Points control operating from the bottom leg of the 'Y' which work fine and is totally independant of the timing circuit.
I need the timing delay to allow the Loco to stop & wait before reversing direction.
There is a Diode imbedded in the Rail at each end of the 'Y' to stop the Loco untill the polarity is changed.
I have a circuit using a LM556 as an 'Alternating Input Driver', which will change the state of a relay each time an input is detected. I also have a circuit which will allow me to use the Photo Interruptors, independantly driving an LM 339 to give an output to the LM556 Circuit. This works in theory, but I haven't tested it yet.
I can competantly build circuits but unfortunately my electronics design is not up to scratch as my knowledge is limited in this area.
Can anyone assist perhaps.
Imagineering
New Zealand.
I intend to have 3 separate independant inputs (ie. LED/Phototransistor Interruptor).
If any single Phototransistor is triggered, a DPDT Relay changes state. (ie. if it's ON it turns OFF, if OFF it turns ON).
There must be a delay of approx 5-10 seconds between the Trigger Input and the Relay change of state.
At present I have a Model Railway with 3 tracks, (think of a Y). The Loco can move to all 3 legs of the 'Y' and is controlled by a simple 555 timer which changes Track Polarity. One of the arms of the 'Y' is about 1.5 Metres long and this determines the Timer setting. However, the other 2 legs of the 'Y' are only 300mm long and the delay before Polarity change is unacceptable. I have automatic Points control operating from the bottom leg of the 'Y' which work fine and is totally independant of the timing circuit.
I need the timing delay to allow the Loco to stop & wait before reversing direction.
There is a Diode imbedded in the Rail at each end of the 'Y' to stop the Loco untill the polarity is changed.
I have a circuit using a LM556 as an 'Alternating Input Driver', which will change the state of a relay each time an input is detected. I also have a circuit which will allow me to use the Photo Interruptors, independantly driving an LM 339 to give an output to the LM556 Circuit. This works in theory, but I haven't tested it yet.
I can competantly build circuits but unfortunately my electronics design is not up to scratch as my knowledge is limited in this area.
Can anyone assist perhaps.
Imagineering
New Zealand.