Hi there,
1) I have a cheap Xmas train set runnign on non-energised plastic tracks. The engine takes two AA batteries and has a switch forward / reverse / stop on it. The two batteries drive a 3 Volt electric motore who drives the wheels via a worm mechanism.That is all
Now, I woudl like to be able to push a switch (original or other) and the train to run for say 3 to 5 minutes after which to stop until the switch is pressed again or cycled.
The problem is that I have 3 volts available only and there shoyudl be very small current drawn after the delay time has elapsed and thew circuit switches off, so no relays.. although I have a small electric motor in there (it is a small train set with 3 carriages only so low amp draw when on)
It can be done with a 555 probably, but no idea how... I can solder and test with multimeter etc but circuit design...
2) Actually - I realised I actually need something similar for my car in case someone leaves the door or boot open - the circuit should turn on instantly and then switch off ater 10 minutes (longer time) even if the trigger is still on (door still open) - new cars have this feature to avoid battery drain. Again the current drain should be quite l;os once tghe circuit has switched off - so having a NC relay and using a typical delay on circuit woudl have the relay coil energised indefinitely which, with LED interior lights, will draw more current than the lights them selves
So, similar circuits except the delay time and operating voltage (3V vs 12v)...
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For 2) Yes, I have seen this
Will it do for the car application, although the reed relay will drain extra current? The new LED interior lights draw very small current... so no relay necessary and low current drain when activated would be required (else no sense in doing the whole thing). Is there really no simpler circuit I can use I wonder...
1) I have a cheap Xmas train set runnign on non-energised plastic tracks. The engine takes two AA batteries and has a switch forward / reverse / stop on it. The two batteries drive a 3 Volt electric motore who drives the wheels via a worm mechanism.That is all
Now, I woudl like to be able to push a switch (original or other) and the train to run for say 3 to 5 minutes after which to stop until the switch is pressed again or cycled.
The problem is that I have 3 volts available only and there shoyudl be very small current drawn after the delay time has elapsed and thew circuit switches off, so no relays.. although I have a small electric motor in there (it is a small train set with 3 carriages only so low amp draw when on)
It can be done with a 555 probably, but no idea how... I can solder and test with multimeter etc but circuit design...
2) Actually - I realised I actually need something similar for my car in case someone leaves the door or boot open - the circuit should turn on instantly and then switch off ater 10 minutes (longer time) even if the trigger is still on (door still open) - new cars have this feature to avoid battery drain. Again the current drain should be quite l;os once tghe circuit has switched off - so having a NC relay and using a typical delay on circuit woudl have the relay coil energised indefinitely which, with LED interior lights, will draw more current than the lights them selves
So, similar circuits except the delay time and operating voltage (3V vs 12v)...
-------
For 2) Yes, I have seen this
Will it do for the car application, although the reed relay will drain extra current? The new LED interior lights draw very small current... so no relay necessary and low current drain when activated would be required (else no sense in doing the whole thing). Is there really no simpler circuit I can use I wonder...