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220V AC siren circuit  See Other projects in :  Alarm systems  •  Mini Projects  And:  Alarm sounds ,  Sirens   Posted by admin - May 16, 2014 at 12:33 am This circuit is a simple siren circuit that use 220V AC as power supply. It is small size and use a piezo speaker cause use low power and saving. How it works This circuit is shown as  Figure 1  which we use power source by reducing AC-voltage of 220 volts down by the resistors-R1, R2 ; the capacitor-C1 act as coupling AC-voltage. Secondly, the current will rectifier into DC voltage by diode bridge D1-D4. And there is C2 function to filter steady DC current. Figure 1 The simple 220V AC siren circuit. The some voltage will flow to emitter lead of Q5 and other will is sent to R3-R6 to reduce voltage to ZD1 before, which it will maintain the steady (DC) current regulated supply at about 9.1 volts. The capacitor-C3 will smooth or filter the pulsating voltage from a power supply into direct current. To begin with press

12 Volt to 220 Volt Inverter 500W  See Other projects in :  Cool Projects  •  Inverters  •  Mini Projects  And:  2N3055 ,  High Power inverter ,  Home power inverter   Posted by admin - April 11, 2007 at 6:59 am This is circuit Inverter 12VDC to 220V 50Hz 500W. It easy to make and Low cost. Friends favorite circuit about the the inverter, because like working outdoors, or to backup storage to use when necessary. Most of this is circuit low power, which is not suitable for practical applications. My friends said that he would be about 500 Watt. It is a good size. Use with television receivers and light bulbs as well. When looking for circuit. I get headaches. If you are a beginner or I can not buy expensive good quality circuits. Requires only one transistor. Or if you have free time. I want to build old circuit is alive again. This circuit will accommodate all your needs. It is a simple circuit. The same principle, I take battery voltage 12V to produce a oscillator about 10

Inverter 100W 12VDC to 220V by IC 4047 – IRF540  See Other projects in :  Inverters  And:  Home power inverter ,  IC 4047   Posted by admin - October 12, 2007 at 6:41 pm This is  inverter 100W  circuit, use  IC 4047  alike  inverter 100W transistor  I use  Mosfet IRF540  instead  Transistor 2N3055 . It good Idae, power output 100W from transformer 2-3A. Read detail more in circuit.

Inverter 500W 12V to 220V By 4047+2N3055  See Other projects in :  Inverters  •  Simple Circuits  And:  High Power inverter ,  Home power inverter ,  IC 4047   Posted by admin - May 28, 2007 at 12:20 pm Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. How to calculate transformer rating The basic formula is  P=VI  and between input output of the transformer we have  Power input = Power output For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1 So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A. author: Ashad Mustufa Source: electronic-lab.com Related Links More about High power inverter circuit More circuits about IC4047 500 watt inverter 12 Volt to 220

DIY DC Power Supply As most of us keep working on simple circuits at our home electronics lab. As anyone with a home electronics lab would say it is never complete without a good bench power supply. When I went to ask about the power supply I was shocked to hear that the price was about 2000Rs. for a circuit which would cost about 200rs at max. So I built my own DC Power supply which had a range from 0 to 25V of regulated DC power output. CHECKLIST: Here is the list of components you’ll require to build your own DC power supply: Item                                         Quantity (Nos.)                       Cost (Rs) AC plug ( 2 Pin)                                   1                                  10 A 10:1 1A Transformer                        1                                  110 LM 317 Voltage Regulator                   1                                  30 Heat Sink                                            1                                  4

UBAHSUAI SAMBUNGAN PAIP AIR Setelah bertahun sambungan dan  sistem automatik sedia ada digunakan, akhirnya ia perlu diubah, bersesuaian dengan perubahan keadaan semasa. bagaimanpun sistem pintarnya tetap di gunakan. GAMBAR 1 (litar asal sebelum ubahsuai) Dalam sistem lama, bekalan air (SAJ 2)  kepada tangki di bahagian supermarket adalah tidak mencukupi. Kadar aliran airnya yang perlahan tidak dapat menampung kegunaan semasa. Untuk mengatasi masalah ini, bekalan tambahan diperolehi dari bekalan air ke tangki toilet (SAJ 2). Bekalan air ke toilet ini pula dipam dari tangki sedia ada yang terletak dibahagian yang lebih rendah (tingkat 1). Oleh kerana kedudukannya yang rendah, saiz paipnya yang besar, maka jumlah air masuk ketangki ini adalah lebih tinggi dan dapat menampung air untuk kegunaan kedua-dua tangki toilet dan bahagian supermarket. Sistem litar air secara pintar digunakan untuk memudahkan kerja-kerja pembekalan air. Ianya menggunakan beberapa ko