Print PDF
Favorite
Email
Step 4Mount the LEDs
Put the LEDs in the holes to see if they fit. if they don't enlarge the hole with the dremel or a file or whatever. Remove burrs with a sharp knive, remove plastic dust.
Now, on the bottom side of the keyboard (with the controller) locate GND and VCC near the connector where the cable gets in. Use a voltmeter for this. I found 4.5V supply voltage. No idea if this is a "standard" keyboard voltage.
Then calculate the current limiting resistors you need, using ohms law. I choose 15mA for the LED current. The blue LEDs from my junkbox had a drop of 4V@15mA (must be really crappy ones).
Solder a resistor to each LED.
Solder wires to the LEDs ( white=VCc, green=GND in the pictures)
Do a dry test with a battery or power supply.
Happy? Position the LEDs in such a way as that they shine in between the rows of keys.Get medieval with the glue gun and fix their position.
Now, on the bottom side of the keyboard (with the controller) locate GND and VCC near the connector where the cable gets in. Use a voltmeter for this. I found 4.5V supply voltage. No idea if this is a "standard" keyboard voltage.
Then calculate the current limiting resistors you need, using ohms law. I choose 15mA for the LED current. The blue LEDs from my junkbox had a drop of 4V@15mA (must be really crappy ones).
Solder a resistor to each LED.
Solder wires to the LEDs ( white=VCc, green=GND in the pictures)
Do a dry test with a battery or power supply.
Happy? Position the LEDs in such a way as that they shine in between the rows of keys.Get medieval with the glue gun and fix their position.
| « Previous Step | Download PDFView All Steps | Next Step » |
 |
Add Comment
|
