fewjr
New Head-Fier
- Joined
- Aug 10, 2009
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Hello All,
I was wondering if anyone could give me some insight as to how to choose the proper LED for the Mini3. They offer a calculator here, Calculate Resistors for LEDs which looks straight forward, but I am not sure what to put in the three blanks. I mean I want to be sure I understand what I'm doing.
In the parts list for the Mini3 The Mini³ Portable Stereo Headphone Amplifier it states that "the default resistor values work well for LEDs with rated intensity of about 15mcd to 400mcd. If you have LEDs with much higher intensity than that, you should increase the resistances". I believe the LEDs I ordered may be wrong for my application and need to know if I need to order different LEDs.
These are the ones I have-
Power On LED: http://www.mouser.com/catalog/specsheets/83016.pdf Which has a 5.6K ohm (R6) resistor as default on schematic to limit current.
Charge On LED: http://www.mouser.com/catalog/specsheets/83006.pdf
Which has a 10K ohm (R7) resistor as default on schematic to limit current.
Using the calculator do I use 9 volts as my voltage supply? The amp is powered by a 9 volt battery, but on the schematic I see 16 volts in the power supply: The Mini³ Portable Stereo Headphone Amplifier This may well be part of the charging circuit voltage. I am still trying to understand the schemo.
As far as LED forward voltage and LED current for the calculator, I figured I get those values from the specs for the LEDs I have, is that right?
I was hoping someone could help me understand how to choose the right LEDs.
Thanks,
fewjr
I was wondering if anyone could give me some insight as to how to choose the proper LED for the Mini3. They offer a calculator here, Calculate Resistors for LEDs which looks straight forward, but I am not sure what to put in the three blanks. I mean I want to be sure I understand what I'm doing.
In the parts list for the Mini3 The Mini³ Portable Stereo Headphone Amplifier it states that "the default resistor values work well for LEDs with rated intensity of about 15mcd to 400mcd. If you have LEDs with much higher intensity than that, you should increase the resistances". I believe the LEDs I ordered may be wrong for my application and need to know if I need to order different LEDs.
These are the ones I have-
Power On LED: http://www.mouser.com/catalog/specsheets/83016.pdf Which has a 5.6K ohm (R6) resistor as default on schematic to limit current.
Charge On LED: http://www.mouser.com/catalog/specsheets/83006.pdf
Which has a 10K ohm (R7) resistor as default on schematic to limit current.
Using the calculator do I use 9 volts as my voltage supply? The amp is powered by a 9 volt battery, but on the schematic I see 16 volts in the power supply: The Mini³ Portable Stereo Headphone Amplifier This may well be part of the charging circuit voltage. I am still trying to understand the schemo.
As far as LED forward voltage and LED current for the calculator, I figured I get those values from the specs for the LEDs I have, is that right?
I was hoping someone could help me understand how to choose the right LEDs.
Thanks,
fewjr