I dont know what you just said. Can you explain it more...simply lol.
I only understand I need a 120 ohm resistor. Can someone explain this whole resistor thing, and what it does to everything, and what it does to the britness of the LED. DO I hook up the resistor to the - or+ of the LED, is there a + or - on the resistor?
Sorry for asking questions, I just...want to know.
The resistor in series with the LED limits its current. Its max allowed current is about 30mA. It is a very old LED so it isn't very bright at 30mA. At less current then it is less bright. A higher resistor value reduces its current.
The 9V battery does not have much capacity. Its voltage drops as it quickly runs down. The 5V regulator needs a minimum input of 7V so measure the battery voltage frequently and replace it frequently.Six AA cells in series have 5 times more capacity and cost about the same as a 9V battery.
The resistor in series with the LED limits its current. Its max allowed current is about 30mA. It is a very old LED so it isn't very bright at 30mA. At less current then it is less bright. A higher resistor value reduces its current.
The 9V battery does not have much capacity. Its voltage drops as it quickly runs down. The 5V regulator needs a minimum input of 7V so measure the battery voltage frequently and replace it frequently.Six AA cells in series have 5 times more capacity and cost about the same as a 9V battery.
6 alkaline battery cells make 9V when new, the same as a 9V battery except their capacity is double. The LED and its same resistor are connected to 5V the same as before.
My drawing doesn't have a 0.01uF capacitor.
Regulator manufacturers recommend an input capacitor of about 0.22uF and an output capacitor of 0.1uF. For some circuits a 10uF output capacitor is best.
I increased the value of the input capacitor to 100uF because a little 9V battery is weak and the 100uF filters it well.
Cause, the last person said that 9v wont charge anything. I read online that 7 or 6 AAA or AA will charge a ipod, so I was wondering mabye two 9v will to.
There are many ipods. One has a tiny battery and another has a pretty big battery. I don't know which battery yours has. What is the output rating of its charger and how long does it take to charge?
There are a few 'MinyBoost" ipod chargers or extra battery circuits on the internet. One says it doesn't work. Most are "instructables" with no schematic or errors on their schematic.
The best ones use 4 AA Ni-MH rechargeable cells that last a long time and don't need a voltage regulator (4.8V to 5.0V).
!! I got the 100ohm and 2 10ohm resitors(RS didnt have 120ohms) so now it works. I just used a 9v. It should be fine..cause, I didnt want to have a big box, i wanted it portable.
The resistor in series with the LED limits its current and adjusts its brightness.
120 ohms makes it very bright.
150 to 220 ohms makes it not so bright.
270 to 1000 ohms makes it dimmer.
1.5k to 10k ohms makes it very dim.
15k to 100k ohms makes it extremely dim.