Rongge

Circuit Description: Ever Imagined controlling your home appliances using your cell phone. You can find a lot of circuits for this application. But they make use of Telephone. I modified the circuit and redesigned it to make it compatible with normal cell phone headphone. Just connect the your phone headphone jack to the phone and the connections to the circuit as shown in the circuit. The relays are connected using the resistor and transistor. Use ULN2803 to reduce the circuit size and increase the performance. The connections from the output of flip-flops has to be given to the inputs of the buffer and relays has to be connected to the buffer. Normally the tip of the headset is connected to the circuit to the 0.1uF capacitor as shown in the circuit diagram. The ground pin of headphone is connected to the ground of the circuit. Circuit Diagram: Operation: When you press keys in your Phone, the other person will hear some tones with respect to keys pressed. This tones are based on the ...

Here are a simple electronic circuit diagram Project of Solar Cell NiCad Charger, this circuit is a very easy build. Solar Cell NiCad Charger Circuit Diagram: Parts List: R1 = 820K, 1% R2,R3 = 75K, 1% R4 = 1M, 5% D1,D2 = 1N5817, Schottky diode, or NTE585 L1 = 100uH, coil U1 = MAX639, integrated circuit C1 = 100uF/40V, Electrolytic capacitor C2 = 47uF/40V, Electrolytic capacitor Additional Notes: The MAX639 has its own current limiter build in, set for 200mA. Plenty! Make sure that the charging NiCads can handle the continuous current of 200mA, for example, NiCad battery packs of 1700+ mA used for R/C (Radio Control) cars and electric aircraft. The schematic is copyright © by Maxim and used with permission. However, the diagram as shown on the Maxim website, has a problem. It shows incorrect values for D1/D2 diodes (1N5117). I updated this value to 1N5817.