Hi All, new member and looks like a nice and active forum.
Appreciate any help someone could give.
Because of some basic electronics I took over 20 years ago at DeVry, a friend has convinced me to design a valve controller for his new aquarium.
I am using the Arduino platform.
The Arduino will be controlling (3) 24vdc valves, which have a max current pull of ~0.5A.
Duty cycle is open/close every 3-5 minutes, 24x7.
I was initially going to use the standard relays, however they seemed expensive, bulky, and not suitable for the duty cycle. And, would prefer to use an Arduino/AVR 5v output pin to a logic level gate device.
I have the following power transistors available to use, not sure if there is any special considerations that need to be taken into account.
And, I believe I read that a diode is needed to prevent in-rush current?
Appreciate any help.
Cheers!
IRLZ14 HEXFET N-Channel Power MOSFET (IR)
Features:
Rated: 60V 10A
Dynamic dv/dt rating
Logic level gate drive
175°C operating temperature
Fast switching
Ease of paralleling
Simple drive requirements
TIP31B Silicon Plastic NPN Power Transistor (Motorola)
Features:
Collector-Emitter Saturation Voltage - VCE(sat) = 1.2 V (Max) @ IC = 3.0 Adc
Collector-Emitter Sustaining Voltage -VCEO(sus) = 80 Vdc (min)
High Current Gain Bandwidth Product fT = 3.0 MHz (min) @ IC = 500 mAdc
MJE802 Power 4A 80V NPND Transistor (Motorola)
Features:
High DC Current Gain - hFE = 2000 (Typ) @ IC = 2.0 Adc
Monolithic Construction with Built-in Base-Emitter Resistors to Limit Leakage - Multiplication
Appreciate any help someone could give.
Because of some basic electronics I took over 20 years ago at DeVry, a friend has convinced me to design a valve controller for his new aquarium.
I am using the Arduino platform.
The Arduino will be controlling (3) 24vdc valves, which have a max current pull of ~0.5A.
Duty cycle is open/close every 3-5 minutes, 24x7.
I was initially going to use the standard relays, however they seemed expensive, bulky, and not suitable for the duty cycle. And, would prefer to use an Arduino/AVR 5v output pin to a logic level gate device.
I have the following power transistors available to use, not sure if there is any special considerations that need to be taken into account.
And, I believe I read that a diode is needed to prevent in-rush current?
Appreciate any help.
Cheers!
IRLZ14 HEXFET N-Channel Power MOSFET (IR)
Features:
Rated: 60V 10A
Dynamic dv/dt rating
Logic level gate drive
175°C operating temperature
Fast switching
Ease of paralleling
Simple drive requirements
TIP31B Silicon Plastic NPN Power Transistor (Motorola)
Features:
Collector-Emitter Saturation Voltage - VCE(sat) = 1.2 V (Max) @ IC = 3.0 Adc
Collector-Emitter Sustaining Voltage -VCEO(sus) = 80 Vdc (min)
High Current Gain Bandwidth Product fT = 3.0 MHz (min) @ IC = 500 mAdc
MJE802 Power 4A 80V NPND Transistor (Motorola)
Features:
High DC Current Gain - hFE = 2000 (Typ) @ IC = 2.0 Adc
Monolithic Construction with Built-in Base-Emitter Resistors to Limit Leakage - Multiplication