Operation Instructions

Page 5 of 18 Revision Date: February 20, 2007
SuperDroid Robots Inc
http://www.SuperDroidRobots.Com
Assembly of the 2 Relay board:
1. Start by laying the board out in front of you. The Label should be on the bottom right topside.
Refer to Figure 2.
Figure 2: TTL High Current Driver with 2 Power Relays
2. Insert all the LEDs as shown in Figure 2 in a staggered location. The long leg of the LED
should be towards the TTL Input edge of the board (they will not work if put in the other way).
Please Note: If you use the LEDs, the supplied voltage to the output will be about 10% less
than the Input voltage since it drops some voltage to ground to light the LEDs. (If
you put 12V as the input voltage, you will only get about 11 volts on the output
pins.) Both the 12V and 5V relays will still pull in fine at this slightly reduced
voltage. If the voltage drop is an issue either increase the output voltage supply
or don’t use the LEDs.
3. Insert all the resistors as shown in Figure 2. The orientation of the resistor is not important.