I have always used USB power but it's time to take my project and box it. This means I now need an external power source. I plan on using a 9v battery. My problem is all of the components are rated for less. Can I just use resistors to step it down? (i.e. on 5.0v PIC @ 220uA should I just use a 10k resistor?)
Or, should I use a Voltage Regulator, such as one of the one's below?
1) http://www.radioshack.com/product/index.jsp?productId=2062599
2) http://www.sparkfun.com/products/107
Here are the parts I am using right now:
PIC16F690 2.0-5.5v 220 uA
7-Segment LED 2.0v 30mA (Currently using 100 ohm resistor)
MQ-3 Sensor 5.0v 100mA
3 LED's @ 3.3v typical, 20mA (Currently using 82 ohm resistors)
Also, any advice on how to use a voltage regulator if you think I should go that route? I read capacitors maybe are needed? Why I am not sure.
Or, should I use a Voltage Regulator, such as one of the one's below?
1) http://www.radioshack.com/product/index.jsp?productId=2062599
2) http://www.sparkfun.com/products/107
Here are the parts I am using right now:
PIC16F690 2.0-5.5v 220 uA
7-Segment LED 2.0v 30mA (Currently using 100 ohm resistor)
MQ-3 Sensor 5.0v 100mA
3 LED's @ 3.3v typical, 20mA (Currently using 82 ohm resistors)
Also, any advice on how to use a voltage regulator if you think I should go that route? I read capacitors maybe are needed? Why I am not sure.
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