Skema Rangkaian|Electronic Schematic Circuit Diagram

Device selection by 3-8 decoder

At this circuit, the selection of seven devices are done using the decoder(74HC138).

The alternative of the accessory is done by ambience the achievement of the decoder into the PNP-type transistor(2SA1015).

The breeze of the accepted through the transistor at the called accessory is possible. The transistor of the accessory which isn’t called is alone from the ambit because it is in the OFF condition.

BCD about-face (Input), Start about-face (Input) and LED (Output) are controlled alone by anchorage B. According to the called device, a approach of anchorage B is changed.

If you want to see more about the Count-down Timer Circuit, please visit here>>

Digital LCD Thermometer Circuit

At this thermometer, the IC thermo sensor (S8100) or the diode (1S1588) is acclimated as the thermo sensor. Back application the IC thermo sensor, the thermometry to +100°C from -40°C is possible. Also, back application the diode, the altitude to +150°C from -20°C is possible. Both sensors are independent in the kit.

This time, I acclimated the diode as the thermo sensor to admeasurement added than +100°C.

ICL7136 of Intersil (Harris) is acclimated for the thermometer and is barometer the change of the advanced administration minute voltages of the diode by the temperature. The 3-1/2 digits aqueous clear affectation (SP521PR) is acclimated for the display. The best cogent chiffre can affectation alone “1″.

The burning electric ability of ICL7136 is actual baby and it is accessible to accomplish about 3 months continuously with the 9-V cell.

The capital genitalia are independent in the kit. The artificial case and the corpuscle are contained. But, there is not a affiliation cable of the sensor.

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Rangkaian Pendeteksi Hujan-Rain Detector

This rain detector will accord you a heads-up the burning it starts to rain, hopefully giving you time to abutting windows and accompany in possessions. The battery-powered ambit draws around no accepted back the sensor is dry and the accepted burning is low back the buzzer is activated so a brace of AA beef will aftermost a continued time. Alternately, a molded ability accumulation with a simple voltage regulator to bead the voltage to 3 volts could be used. The ambit is basically a accessible flasher ambit that operates able-bodied on alone 3 volts application accustomed silicon transistors. Back the ambit is triggered, the buzzer is pulsed about already per additional for a actual abbreviate time, giving it a “dripping water” complete which seems appropriate. A slower, best beep may be had by accretion the 1 uF capacitor. The 10 k resistor may be added for a best beep time after abbreviating the beep amount but at some point the ambit will cease to action properly, depending on the accretion of the transistors.

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