Audio Control Switch Clap On/Off Model GSK-409 Classified as a remote controlled circuit this product uses an Figure 1 Installing components audio signal (clap on) to activate the on/off function of the switch. A sensitivity/volume controlled microphone picks up audio signal activating a relay generating an electrical signal to the switch. Technical Specifications n Power Source: 12 VDC n Power Consumption: 50 mA max. n Sensitivity Adjustment: potentiometer n Maximum Load: 10 A, 125 VAC or 5 A, 220 VAC n PCB Dimensions: 2.92 x 1.49 inches Operating Principles This circuit utilizes a sensitivity microphone to obtain an audio signal and a flip-flop circuit to turn the switch to the on and off position. The audio signal enters from the microphone to transistor 1 through capacitor 2 entering variable resistor 1 allowing sensitivity adjustments. The collector of transistor 2 is connected through capacitor 3 and 4 creating a flip-flop sector comprising of transistor 3 and 4 both taking turn functioning to the signal transmitted by the microphone. The transmittal of an audio signal through transistor 1 and 2 causes the collector of transistor 2 to be amplified creating a momentary low voltage while current at the base of transistor 4 is drawn through diode 2 and capacitor 4 to ground at collector Testing transistor 2 making transistor 4 stop inducing current. The Connect the 12VDC power source and adjust variable higher voltage will cause transistor 3 to draw current through resistor 1 to just past neutral. The LED may be on or off the base of transistor 4 and ground causing transistor 3 to test by clapping your hands LED should change from previous work in place of transistor 4. At this point the relay will release condition clap hands once more and LED should return to the contact face so the LED will be turned off. Transistor 4 will original position. The LED should go on and off by clapping be inactive until an audio signal is present to cause transistor 3 your hands if so, the circuit is working. Connect the audio to stop induction and then transistor 4 will start functioning. control switch at OUT terminal and connect the unit to the IN terminal. PCB Assembly Please refer to Figures 1, 2, and 3 for aid in component Troubleshooting placement. It is recommended to start with lower components The main cause of problems will come from misplaced i.e. diodes, resisters, electrolyte capacitors, and transistors. components or faulty soldering. Utilize figure 2 and 3 to Be careful to check polarity with Figure 3 before soldering. ensure proper placement, polarity and then check solder Take extra precaution to ensure electrolytic capacitors are points for connectivity. inserted correctly. If a problem is detected it is best too use a desoldering pump or desoldering braids to remove component. Accessories This will minimize potential damage to the printed circuit board. Use GSB-04 (sold separately) to house the PCB and batteries. Electronic Kit Set for Hobby & EducationFigure 2 Audio control switch circuit Figure 3 Connecting Circuits GSK-409 Resistors R1, R10 1 k brown black red gold R2 1 M brown black green gold R3, R8 10 k brown black orange gold R4 56 k green blue orange gold R5, R9 47 k yellow violet orange gold R6 3 k orange black red gold R7 5 k green black red gold Potentiometer VR1 103 or 14 or 10 k Ceramic Capacitors C1 104 or 0.1 F C6 273 or 0.027 F Electrolytic Capacitors C2 0.1 F C3, C4, C5 2.2 F C7 10 F Transistor TR1, TR2, TR3, TR4 C458, C828, C945, C1815 Diodes D1, D2, D3 1N4148 www.globalspecialties.com