Humidity Soil Test

This indicator is called a series of soil moisture because this tool can be used to determine water content in soil or soil moisture. How to use this tool is very simple, namely: probe inserted in the soil near the plant that will be reviewed. LED will flash if the humidity does not work enough and if the humidity is less. Probe can be made from copper wire that dikelupas skins, probe length of approximately 100-150mm. LED should be inverted installation.
Components needed:

1. R 1 = 100ohm
2. R 2 = 10Kohm
3. R 3 = 100Kohm
4. R 4 = 1Kohm
5. R 5 = 100Kohm
6. R 6 = 39ohm
7. Rv = 10K
8. Tr 1 = BC548
9. Tr 2 = BC558
10. LED

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Bird Sound Door Bell

Friends may be bored listening to the sound only monoton bell at home, if you make a doorbell iongin with other sound you can try to make a sound with the series of birds. This series is quite simple and PCB is available at many electronics stores.
Components needed:

1. Resistor (R) 1 = 100Kohm
2. Resistor (R) 2 = 5K6
3. Resistor (R) 3 = 5ohm
4. VR = 10K
5. Capasitor (C) 1 = 47nF
6. Capasitor (C) 2 = 20nF
7. Capasitor (C) 3 = 100uF
8. Capasitor (C) 4 = 0nF
9. Capasitor (C) 5 = 10uF
10. Capasitor (C) 6 = 1uF
11. Transistor (TR) 1 = BC109
12. Transistor (TR) 2 = AC128
13. Speaker (LS) = 8ohm

Happy trying!!!

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ELECTRICITY # 4 (Macam-Macam The Electric Energy)

Electricity can be generated through various processes, such as the following:

1. chemical processes, examples and bateray = aki
2. mechanical process, for example = bicycle dynamo and generator

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