FreeTrack Forum - Power source of more than 500mA?

Home

Welcome, you're not connected. ( Log in - Register )

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Power source of more than 500mA?

RSS > Power source of more than 500mA?

DiGGeR	#1 02/08/2008 - 22h08 Top
Class : Apprenti Posts : 7 Registered on : 18/07/2008 Off line	I found that old cell phone chargers are a great source of power to run the LEDs, but its hard to find a charger that reduces its mA to less than 500mA, Its easy to find them at 700mA. Is there anyway to use these chargers or reduce the mA? "Freedom doesn't come Free"
tristan68	#2 03/08/2008 - 12h30 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello digger Cell phone chargers, batteries, ..... are voltage generators This means : they don't produce current but voltage. Current is driven from them when you connect a load to them. The current is load dependant, not generator dependant. As long as the current you try to drain doesn't exceed the Max current your generator is able to sustain , its OK. So I see no problem using a 700mA (max) adapter to power a freetrack setup, which needs only about 25mA to 220mA (approx), depending of your setup and resistor values. Cya
DiGGeR	#3 04/08/2008 - 00h21 Top
Class : Apprenti Posts : 7 Registered on : 18/07/2008 Off line	The current is load dependant, not generator dependant. As long as the current you try to drain doesn't exceed the Max current your generator is able to sustain , its OK. So I see no problem using a 700mA (max) adapter to power a freetrack setup ...... That just gave me a headache, trying to decipher that bit of info... so why can't you use more than 700mA then? Thank you for all your help! "Freedom doesn't come Free"
Deimos	#4 04/08/2008 - 03h51 Top
Class : Beta Tester Posts : 120 Registered on : 07/11/2007 Off line	In other words: charger's output rating (like 700mA) is the MAXIMUM current value it can supply. If you connect a circuit that requires 25mA to run to a 700mA supply, everything is going to be fine, since the supply's output rating isn't exceeded. But if you tried to connect a circuit requiring 700mA to run at full capacity (like a IR led array for reflective tracking) to a 500mA supply, your circuit will get only 500mA so it will be underpowered, and therefore not working at full capabilities (or not working at all, depending on the circuit type).
tristan68	#5 04/08/2008 - 11h25 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Thx deimos But if you tried to connect a circuit requiring 700mA to run at full capacity (like a IR led array for reflective tracking) to a 500mA supply, your circuit will get only 500mA so it will be underpowered, and therefore not working at full capabilities most likely, given the way those little adapters are usually made , the power adapter will fry cya

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Power source of more than 500mA?

> Stats

1 user(s) connected during the last 10 minutes (0 member(s) and 1 guest(s)).