Diagram SOlution

This Flashing LEDs uses a clean Astable multivibrator built around the general timer IC NE555. Resistors R1,R2 and capacitor C1 determines the output frequency. what time the output becomes excessive, Red LEDs light basic. When the capacitor C3 charges fully, Yellow LEDs light. The delay occasion relating this depends on the denomination of C3. while the output of Astable turns low leafy LEDs light using the current stored here the capacitor. Since this cycle is very fast, several levels of Flashing can come to pass obtained. If the light from Green LEDs is low, reduce the numeral to lone.

This is a simple series of fire alarms. In this series used NE555 timer and temperature sensor to detect high temperatures. The working principle of this temperature sensor that is when the temperature is high around the sensor then there is resistance on the sensor to be small. 

However if the low temperature then the resistance will be high. If the resistance of small sensors, the voltage supply will be able to flow past the sensor and activate the transistor.

IC1 NE555 as a regulator of the audio frequency. Transistors 1 and 2 are used as a driver IC1. Output (pin 3) of IC1 would trigger a transistor base T3 (SL100), which drives the speaker to produce sound the alarm. Frequency NE555 depending on resistance values ​​of R5 and R6 and the capacitance sensor C2 temperature. When the temperature gets hot, would provide a low resistance so that supply voltage can flow into the base of transistor T1 through a diode D1 and R2.

Capacitor C1 will charge a positive voltage so that it will increase the time when the fire alarm. The greater the value of C1, the greater the positive bias applied to the base of transistor T1 (BC548). T1 collector coupled to the base transistor T2, transistor T2 provides a positive voltage to pin 4 (reset) from IC1 (NE555). Resistors R4 will make IC1 NE555 continued to be active despite no positive voltage flowing.

Rain detector using In principle it is an astable multivibrator 555, which is prepared by IC555 with a sensor attached that can detect water. Astable multivibrator with the 555 is in the audio frequency with a frequency of 1 KHz. The use of rain detector circuit can be disupplay 555 with voltage source that is free enough as 5 to 15 VDC. In the application of rain detector circuit The use of this object 555 can be mounted engine, car and others who want to protect from rain.

Water sensor used in the rain detector circuit 555 Using this you can do yourself a PCB Degan make the path as shown in the image above or, as described from the image above is the use foil glued to a board or boards that are plastic insulation. The important principle of this sensor is to conduct electrical current very well when the surface is exposed to water even a little.