Solar Guide Light Model GSK-1004 This circuit illuminates 5 LEDs when there is not sufficient Figure 1 Installing components sunlight for the solar panel to charge batteries. The LEDs will automatically turn on and draw voltage from the batteries when the solar panel can no longer convert sunlight to DC voltage. 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 LEDs. Illumination intensity is controlled through transistor 2 and variable resistor 1. Circuit Assembly Special handling instruction Please refer to Figures 1, 2, and 3 for aid in component Extra care must be taken to ensure proper installation of placement. It is recommended to start with lower components solar panel to PCB. Server damage may occur to the solar i.e. diodes, resisters, electrolyte capacitors, and transistors. panel if the positive and negative poles are short circuited Be careful to check polarity before soldering. If a problem is when soldering. 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. Troubleshooting This circuit has only a few components. The main cause of Testing problems will come from misplaced components or faulty Turn the solar panel to receive the maximum sunlight. The soldering. Utilize figures 2 and 3 to ensure proper placement/ LEDs should be off as the circuit is in the recharging cycle. polarity and then check solder points for connectivity. Cover or remove the solar panel from the sunlight and all 5 LEDs should light. Set intensity by adjusting variable resistor 1. Accessories Use GSB-03 (sold separately) to house the PCB and batteries. Note This solar panel will not convert fluorescent light to DC voltage. Electronic Kit Set for Hobby & EducationFigure 2 SOLARNIGHT5 LEDCircuit Figure 3 Connecting circuits GSK-1004 Resistors R1, R2 10 k brown black orange - gold R3 5 k green black red - gold R4, R5 2 k red black red - gold R6 1 k brown black red - gold R7, R8, R10 100 k brown black yellow - gold R9 500 green black brown gold Potentiometer VR1 100 k or 104 Electrolytic Capacitor C1 10 F Transistors TR1, TR2, TR4 C9012 TR3, TR5 C458, C828, C945, C1815 Diodes D1-D6 1N4148 www.globalspecialties.com