I am making a mod for my computer, which uses 10 leds with a Decade counter, which is controlled by my remote.
I am using the 12volt supply with a 9v voltage regulator to power my mod. I am using the proper resistors for all 10 leds using the specs from the data sheets. So that parts fine. But the leds are really dim. So I disconnected the Decade counter and tried powering one of the leds directly to the power source with the proper resistor. It was twice as bright. Is The Decade counter drawing too much current?
Anyone know how I can make my leds brighter?
thanks.
Decrease the serial resistor for desired brightness.The counter output voltage always lower as supply voltage.If You drive the LEDs with multipplex-method, this also drastically decrease the brightness. Some CMOS IC-s have output current limiter about 6mA, in this case need transistors for each LED.
What are you using for the decade counter? A 4017? Many logic families can sink more current than they can source, so you're better off driving the LEDs in a common-anode configuration (sinking current) rather than common-cathode (sourcing current). That requires an inverter for each 4017 output, so it may be simpler to use Spuffock's idea. The low current/high-efficiency LEDs work well on as little as 2mA, vs. 20 mA for standard LEDs.