I'm trying to turn a solenoid valve on and off from the output of a 4049 hex inverter. The solenoid valve is 14 watts, 10.3 ohms and 12 volts. The 4049 runs off the same 12 volt, 8 amp power supply.
I wanted to use a TIP3055 NPN transistor as a switch but I'm having problems.
I want the transistor to turn on when the 4049 output goes high.
If the bias resistor is about 1000 ohms, it works but the transistor runs hot. If the bias resistor is lower (under 400 ohms), it stays fairly cool and works but the output of the 4049 doesn't seem to drop fully low when it should. I have an LED and 1000 ohm resistor running from 12V+ to the 4049 output. The LED still glows slightly. The LED should turn fully off when the output goes low (i.e. input goes high) but it doesn't.
Also, how should the transistor be selected? I picked the TIP3055 because it is 90 watts. Is the hFE too low? Can the 4049 hex inverter put out enough current to drive this?
Thanks in advance for any help.
I wanted to use a TIP3055 NPN transistor as a switch but I'm having problems.
I want the transistor to turn on when the 4049 output goes high.
If the bias resistor is about 1000 ohms, it works but the transistor runs hot. If the bias resistor is lower (under 400 ohms), it stays fairly cool and works but the output of the 4049 doesn't seem to drop fully low when it should. I have an LED and 1000 ohm resistor running from 12V+ to the 4049 output. The LED still glows slightly. The LED should turn fully off when the output goes low (i.e. input goes high) but it doesn't.
Also, how should the transistor be selected? I picked the TIP3055 because it is 90 watts. Is the hFE too low? Can the 4049 hex inverter put out enough current to drive this?
Thanks in advance for any help.