Hi,
I need 5V to power up a receiver whose ratings are marked 5V, 5.5mA max. My idea of obtaining this voltage is to stack up 2 button cells of 3V each, since space is of concern. However, this will give me 6V and I thought of this to bring it to 5V:
Requirements of Receiver
V = 5V
I = 5mA
so R = 1kohm (resistance of receiver)
Plan: Add resistor R1 to bring down voltage supplied to receiver (R).
V = I (R + R1)
I = 5mA
R = 1kohm
V = 6V
Therefore, R1 = 200ohms. So, if I add this resistor, I should get 5V in my receiver and maintain 5mA current. I was hoping if someone can confirm this or am I missing something.
I need 5V to power up a receiver whose ratings are marked 5V, 5.5mA max. My idea of obtaining this voltage is to stack up 2 button cells of 3V each, since space is of concern. However, this will give me 6V and I thought of this to bring it to 5V:
Requirements of Receiver
V = 5V
I = 5mA
so R = 1kohm (resistance of receiver)
Plan: Add resistor R1 to bring down voltage supplied to receiver (R).
V = I (R + R1)
I = 5mA
R = 1kohm
V = 6V
Therefore, R1 = 200ohms. So, if I add this resistor, I should get 5V in my receiver and maintain 5mA current. I was hoping if someone can confirm this or am I missing something.