hi,
Have a project that requires activating a 12dc 9w solinoid and was wondering if this circuit will work ok or if there might be a better way.
I am replacing a dozen urinal flush sensors with push buttons. Yeah I know it seems a step backward but it turns out a push button is the most water conservative device available and we are on a bit of a water saving trend here.
The current system has a 1.5 amp 16vac plug pack going into a black box containing pretty flasing lights and a microwave sensor, this in turn connects to a 12dc 9w solinoid on the water pipe.
I am going to try to rectify the ac, use a LM7812 regulator, a NE555 in monostable mode to drive a BD681 (NPN TO-126 36W 100V 4A 750 1.5A) to open the valve. I need an ajustable time from 5-20 seconds no matter how slow/fast the button is pushed.
Thanks
Have a project that requires activating a 12dc 9w solinoid and was wondering if this circuit will work ok or if there might be a better way.
I am replacing a dozen urinal flush sensors with push buttons. Yeah I know it seems a step backward but it turns out a push button is the most water conservative device available and we are on a bit of a water saving trend here.
The current system has a 1.5 amp 16vac plug pack going into a black box containing pretty flasing lights and a microwave sensor, this in turn connects to a 12dc 9w solinoid on the water pipe.
I am going to try to rectify the ac, use a LM7812 regulator, a NE555 in monostable mode to drive a BD681 (NPN TO-126 36W 100V 4A 750 1.5A) to open the valve. I need an ajustable time from 5-20 seconds no matter how slow/fast the button is pushed.
Thanks