Hi Everyone,
I have decided that it is time i start to learns how to do some basic electronics and i am (trying to) build a simple relay circuit.
This basis for it is i have a sump on my fish tank, a pump within it sends the water back up to the tank. I have a solenoid and float valve which closes the down tube if the water level gets too high and wanted to make a reverse to this so that the pump in the sump turns off if the water gets to low, but i wanted it to stay off for about 30 seconds even after the water level has gone past the float switch.
I have a circuit built at the moment which i have put below (sorry about the bad graphics, but just put it together in paint) but have found that the voltage after the capacitor is 0.74 when it is 8.8 before it.
Obviously this means that there isnt enough voltage to make the relay switch. Reading around it appears that it is normal for the cap to reduce voltage while charging but this doesnt ever seem to switch so i am not sure how to redesign the circuit to still do what i want.
Many thanks for any help you are willing to give to a newbie!
I have decided that it is time i start to learns how to do some basic electronics and i am (trying to) build a simple relay circuit.
This basis for it is i have a sump on my fish tank, a pump within it sends the water back up to the tank. I have a solenoid and float valve which closes the down tube if the water level gets too high and wanted to make a reverse to this so that the pump in the sump turns off if the water gets to low, but i wanted it to stay off for about 30 seconds even after the water level has gone past the float switch.
I have a circuit built at the moment which i have put below (sorry about the bad graphics, but just put it together in paint) but have found that the voltage after the capacitor is 0.74 when it is 8.8 before it.
Obviously this means that there isnt enough voltage to make the relay switch. Reading around it appears that it is normal for the cap to reduce voltage while charging but this doesnt ever seem to switch so i am not sure how to redesign the circuit to still do what i want.
Many thanks for any help you are willing to give to a newbie!