Instruction manual

LEDS1• 14
MORE LEDS!
If 9 LEDs isn’t enough you can purchase a 20 LED array, the LEDS1-LG, from
Ramsey Electronics. This plugs into your kit the same way as the 9 LED
board. We also sell an LED stick that works a little differently. It uses a 3.5mm
stereo phono jack instead of a power plug type jack. The stereo jack plugs into
jack J3 on the LEDS1 main board. To do this you need to solder up a cable
like you did earlier for the 9 LED board that came with the LEDS1. The only
difference is that this time you will solder together 2 stereo plugs that have 3
pins instead of 2. These come with the LEDS1-ST stick kit.
AUDIO RESPONSE TWEAK
Sometimes when using the LEDS1 in audio mode with the low-pass filter
selected, the lights will flash several times to what sounds like a single beat. If
this is annoying, the gain on the amplifier made with U1:B can be lowered to
present less audio peaks to U2, which triggers the LEDs. This means U2 will
trigger less often and there will be fewer flashes for a given sound. To lower
the gain on U1:B, just put a smaller resistor in place of R9. You can even use
a potentiometer. If the gain gets too low, the LEDs won’t flash at all.
Experiment to find the value that gives you the effect you want.
EXTERNAL TRIGGERING
You can trigger the LEDS1 to flash from an external source. This is done by
plugging a 5V DC to 12V DC voltage or pulse into Jack J3. Jack J3 is a
3.5mm stereo phono jack. To connect an external source, you need to buy or
make a double ended cable, each end having a 3.5mm stereo plug.
Observe the pinout shown in the picture. The Ramsey LEDS1ST kit comes
with these.