Solar Guide Light Model GSK-1004 This circuit illuminates 5 LED's when there is not sufficient sunlight for the solar panel to charge batteries. The LED's will automatically turn on and draw voltage from the batteries when the solar panel can no longer convert sunlight to DC voltage. Figure 1 Installing components Technical Specifications n Power Source: 3 rechargeable double AA batteries (not included) n Power consumption: 2.5 mA (standby), 80 mA (working) n Recharging circuit: Built in solar panel n Solar panel: 4 VDC, 60 mA n Intensity adjust: potentiometer n PCB dimensions: 2.39 x 1.70 inches Operating Principles This circuit consists of two parts, the charger and sensor. When the solar panel is facing sunlight it will convert the suns energy to DC voltage and run through transistors 1 and 3 charging the rechargeable batteries. The sensors are activated when the photo-transistor (solar panel) does not receive sufficient sunlight the internal resistance becomes greater triggering transistor 5 to light all LED's. Illumination intensity is controlled through transistor 2 and variable resistor 1. Circuit Assembly Please refer to Figures 1, 2, and 3 for aid in component placement. It is recommended to start with lower components i.e. diodes, resisters, electrolyte capacitors, and transistors. Be careful to check polarity before soldering. If a problem is detected it is best too use a desoldering pump or desoldering braids to remove component. This will minimize potential damage to the printed circuit board. Testing Turn the solar panel to receive the maximum sunlight. The LED's should be off as the circuit is in the recharging cycle. Cover or remove the solar panel from the sunlight and all 5 LED's should light. Set intensity by adjusting variable resistor 1. Note This solar panel will not convert fluorescent light to DC voltage. Electronic Kit Set for Hobby & Education Special handling instruction Extra care must be taken to ensure proper installation of solar panel to PCB. Server damage may occur to the solar panel if the positive and negative poles are short circuited when soldering. Troubleshooting This circuit has only a few components, the main cause of problems will come from misplaced components or faulty soldering. Utilize figures 2 and 3 to ensure proper placement/ polarity and then check solder points for connectivity. Accessories Use GSB-03 (sold separately) to house the PCB and batteries. Figure 2 SOLARNIGHT5 LEDCircuit Figure 3 Connecting circuits GSK-1004 Resistors R1, R2 10 k R3 5 k R4, R5 2 k R6 1 k R7, R8, R10 100 k R9 500 brown - black - orange - gold green - black - red - gold red - black - red - gold brown - black - red - gold brown - black - yellow - gold green - black - brown - gold Potentiometer VR1 100 k or 104 Electrolytic Capacitor C1 10 F Transistors TR1, TR2, TR4 TR3, TR5 C9012 C458, C828, C945, C1815 Diodes D1-D6 1N4148 www.globalspecialties.com