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Skema Ukuran Box Subwoofer 10

noreply@blogger.com (Anonymous) — Mon, 21 May 2012 01:11:00 -0700

This subwoofer box was created to match and aid the 1.618 Hi-Vi 3-way tower loudspeakers. The main focus of the HiVi 10" subwoofer was to reproduce ultra low frequencies that the 1.618 could not reproduce and aid in overall low end musical reproduction. Low, flat and not "boomy" was priority one. This subwoofer project uses the 10" subwoofer driver which can deliver plenty of bottom end.

The enclosure design and model frequency response are shown below.10" 4 ohm subwoofer

1.O-Audio 500 Watt plate amplifier
2.Freq Response: 25Hz up to chosen x-over point.
3.Overall Dimension: 21"x 12.75"x 20"

3VDC Stereo Headphone Amplifier by IC LM4910

noreply@blogger.com (Anonymous) — Mon, 21 May 2012 00:47:00 -0700

3VDC Stereo Headphone Amplifier by IC LM4910 This is a stereo headphone amplifier circuit of using LM4910 IC. This circuit is very simple so it is very easy to make even for beginners once. because the voltage source is used only 3 VDC you can use 2 x A3 battery in series stacking.

LM4910 Boomer belonging to the series of National Semiconductors is an integrated stereo amplifier is primarily intended for headphone stereo applications. The IC can be operated from 3.3V ans its 0.35mW can deliver output power into a 32 ohm load. The LM4910 has very low distortion (less than 1%) and the shutdown current is less than 1uA. This low shutdown current makes it Suitable for battery operated applications.

C1 and C2 are the input DC decoupling capacitors for the left and right input channels. R1 and R2 are the respective input resistors. R3 is the feed back resistor for left channel while R4 is the feed back resistor for the right channel. C3 is the power supply filter capacitor. The feedback resistors also sets the closed loop gain in conjunction with the corresponding input resistors.

Skema BA5417 stereo amplifier

noreply@blogger.com (Anonymous) — Mon, 21 May 2012 00:26:00 -0700

BA5417 stereo amplifier circuit has of good features like thermal shut down, standby function, soft clipping, wide operating voltage range etc. The circuit can be deliver 5W × 2 when VCC = 12V and RL = 4Ω, or 2.8W x 2 when VCC = 9V RL = 3Ω.This and amplifier circuit has excellent sound

quality, and low THD (total harmonic distortion) around 0.1% at F = 1kHz; Pout = 0.5W C-in are DC decoupling capacitors which block any DC level present in the input signals. C3 and C5 couples the amplifiers left and right power outputs to the corresponding loud speakers. C2 and C6 are bootstrap capacitors. Bootstrapping is a method in which a portion of the amplifiers is taken and applied to the input. The prime objective of bootstrapping is to improve the input impedance. Networks R1,C1 and R2,C7 are meant for improving the high frequency stability of the circuit. C4 is the power supply filter capacitor. S1 is the standby switch. C8 is a filter capacitor. RF1 and RF2 sets the gain of the left and right channels of the amplifier in conjunction with the 39K internal feedback resistors.

Rangkaian regulator IC 7905-7912-7915

noreply@blogger.com (Anonymous) — Tue, 8 May 2012 07:58:00 -0700

The available voltage from a voltage source that is usually not appropriate to the needs. It is necessary for a voltage regulator that functions to maintain the constant voltage value on a certain value. Voltage regulator chip is usually a code with the 78xx or 79xx. For the 79xx series is used for DC negative voltage regulator. xx indicates the regulator output voltage. For example, the system needs is a -5 volt

negative, the regulator used is 7905. Chip regulator consists of three pins, namely input, output and ground. In this IC uses the input voltage must be greater several percent (depending on the data sheet) from the value output voltage.

Skema Adaptor 12 volt 20 ampere

noreply@blogger.com (Anonymous) — Tue, 8 May 2012 07:58:00 -0700

Now it should not have to wrestle again seek op-amp, transistor and other components to realize a massive circuit of regulators, because the circuit of this kind have been packed into a fixed voltage regulator IC. Currently, many components known as the 78XX series fixed positive voltage regulator and the 79XX series is a voltage regulator to remain negative.

Even the components are usually already equipped with a flow divider (current limiter) and also the constraint temperature (thermal shutdown). This component is only three pins, and by adding some components can only have a circuit of ration power ter-regulation with either.

For example, 7805 is a voltage regulator to get a 5 volt, 7812 voltage regulator 12 volt, and so on, for example, while the 79XX series is the 7905 and 7912 respectively are negative voltage regulators 5 and 12 volt.

RANGKAIAN ADAPTOR 12 VOLT

The adapter has a set of outputs (output) 12 volt which is teregulasi well. If the components that were installed in accordance with the scheme under the set of the circuit of this adapter safe burdened to 5 ampere, if you want this adapter is able to provide a greater flow you can add a power transistor (2N3055) and replace the bridge diode with diode which has a more ampere high. Exodus circuit of this adapter can be used to run the tape the car, the radio transmitter, CCTV cameras, and other electronics equipment.

Gbr. Skema rangkaian adaptor 12 volt, 5 ampere

List of components adapter 12 volt:
1.D1-D4 = 6 A
2.D5 = 1 A
3.C1 = 4700u/50V
4.C2 = 220u/25V
5.C3 = 100u/25V
6.R1 = 1k
7.R2 = 0.2Ohm/5Watt
8.F1 = Fuse (skring) 2 A
9.F2 = Fuse (skring) 6 A
10.IC1 = 7812
11.TR1 = 2N3055
12.T1 = Trafo 15Volt/5A

Scheme following a circuit of adapter has the ability to supply higher current (20 ampere is reached). For fans radio transmitter (radio station) following a circuit of adapter is suitable to use. Provide a good cooling on the power transistor (MJ 2955) because the transistor will be very hot when the adapter to provide a large flow.

HEXFET® Power MOSFET

noreply@blogger.com (Anonymous) — Sun, 6 May 2012 08:38:00 -0700

Advanced HEXFET® Power MOSFET from International Rectifier utilize advanced processing techniques to achieve extremely low on-resistance per silicon area. This benefit, combined with the fast switching speed and ruggedized device design that HEXFET power MOSFETs are well known for, provides the designer with an extremely efficient and reliable device for use in a wide variety of

applications. The TO-220 package is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts. The low thermal resistance and low package cost of the TO-220 contribute to its wide acceptance throughout the industry.

IRF Z44N

Absolute Maximum Ratings

Notes:

Repetitive rating; pulse width limited by max. junction temperature.

Starting TJ = 25°C, L = 0.48mH RG = 25W, IAS = 25A.

ISD £ 25A, di/dt £ 230A/μs, VDD £ V(BR)DSS, TJ £ 175°C.

Pulse width £ 400μs; duty cycle £ 2%.

This is a typical value at device destruction and represents operation outside rated limits.

This is a calculated value limited to TJ = 175°C .

IRF Z44N

Description

Fifth Generation HEXFET® power MOSFETs from International Rectifier utilize advanced processing techniques to achieve the lowest possible on-resistance per silicon area. This benefit, combined with the fast switching speed and ruggedized device design that HEXFET power MOSFETs are well known for, provides the designer with an extremely efficient device for use in a wide variety of applications. The TO-220 package is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts. The low thermal resistance and low package cost of the TO-220 contribute to its wide acceptance throughout the industry.

Notes:

Repetitive rating; pulse width limited by max. junction temperature.

VDD = 25V, starting TJ = 25°C, L = 1.0mH RG = 25W, IAS = 10A.

ISD £ 10A, di/dt £ 280A/μs, VDD £ V(BR)DSS, TJ £ 175°C

Pulse width £ 300μs; duty cycle £ 2%.

IRF Z48N

Description

Advanced HEXFET® Power MOSFETs from International Rectifier utilize advanced processing techniques to achieve extremely low on-resistance per silicon area. This benefit, combined with the fast switching speed and ruggedized device design that HEXFET power MOSFETs are well known for, provides the designer with an extremely efficient and reliable device for use in a wide variety of applications. The TO-220 package is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts. The low thermal resistance and low package cost of the TO-220 contribute to its wide acceptance throughout the industry.

Absolute Maximum Ratings

NOTES:

Repetitive rating; pulse width limited bymax. junction temperature.

Starting TJ = 25°C, L = 0.37mH RG = 25W, IAS = 32A.

ISD £ 32A, di/dt £ 220A/μs, VDD £ V(BR)DSS, TJ £ 175°C

Pulse width £ 400μs; duty cycle £ 2%.

This is the destructive value not limited to the thermal limit.

This is the thermal limited value.

Rangkaian Regulator 78xx -7805 -7812 -7815.

noreply@blogger.com (Anonymous) — Thu, 3 May 2012 19:03:00 -0700

Rangkaian Regulator 78xx - 7805,7812,7815...)

The available voltage from a voltage source that is usually not appropriate to the needs. It is necessary for a voltage regulator that functions to maintain the constant voltage value on a certain value. Voltage regulator chip is usually a code with the 78xx or 79xx. For the 78xx series is used for DC positive voltage regulator. xx indicates the regulator output voltage. For example, the system needs is a + 5 volt

positive, the regulator used is 7805. Chip regulator consists of three pins, namely input, output and ground. In this IC uses the input voltage must be greater several percent (depending on the data sheet) from the value output voltage.

Chip lm78xx provide facilities in the affairs regulator. price is also relatively inexpensive and easy to find in the market

Features important in the IC LM 78xx:
current up to 1A
Security short internal
Safe temperatures 0°C - 70°C
Temperature max 150°C

Voltage out put in the offer:
LM7805C 5V
LM7806c 6V
LM7808 8V
LM7809 9V
LM 7810 10V
LM7812C 12V
LM7815C 15V
LM7824 24V
To be able to work with both the input voltage must be greater (voltage output volt + 3) of the output voltage. Example of the 7812 then bisanya skitar input voltage 15v

Skema Regulator 3 volt menggunakan IC LM317

noreply@blogger.com (Anonymous) — Mon, 30 Apr 2012 11:14:00 -0700

Skema Regulator 3 volt menggunakan IC LM317 This is based circuit of the LM317 adjustable voltage regulator with a maximum output of 3V/1.5A. The output voltage depends on the Pin 1 (pin ADJ) of IC LM317 or R1 and R2 values, so the circuit Can be modified to use with a maximum output of greater than 3V. while for the maximum output current is related to the package options.In

this circuit, LM317T, Which is capable of transferring up to 1.5A, is used.

When we adjust the R2 to 1.2K then the output becomes nearly 1.56V which is a typical battery voltage level that can be used in development projects. R6 sets the current of the current source so it operates as a zero adjustmend resistor. When the resistor R2 is set to zero, adjust R6 to see zero voltage at the output. R5 protects the transistor BCW33. Red LED is used as a light indicator.

Skema Dual Regulator power supplay +12 dan -12

noreply@blogger.com (Anonymous) — Mon, 30 Apr 2012 11:06:00 -0700

This is of a dual regulated that provides +12V and -12V from the AC mains. A regulator like this is a very essential tool on the work bench of an electronic hobbyist. Transformer T1 steps down the AC mains voltage and diodes D1, D2, D3 and D4 does the job of rectification. Capacitors C1 and C2 does of filtering.C3, C4, C7and C8 are decoupling capacitors. IC 7812 and 7912 are used for the

purpose of voltage regulation in which the former is a positive 12V regulator and later is a negative 12V regulator. The output of 7812 will be +12V and that of 7912 will be -12V.

Use Transformer 15-0-15 V, 1A secondary step-down transformer. Capacitor C1,C2,C5 and C6 must be rated 50V or more.

IC regulator 78xx (7812) Description

The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation.

Features IC LM7812

Output current in excess of 1A

Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18 , 24V

Internal thermal overload protection

No external components required

Output transistor safe area protection

Internal short circuit current limit

Absolute Maximum Ratings IC LM7812

Input Voltage (VO = 5V, 12V and 15V) : 35V

Operating Temperature Range (TA) : 0°C to +70°C

Maximum Junction Temperature : 150°C

Storage Temperature Range −65°C to +150°C

Lead Temperature (Soldering, 10 sec.)

IC regulator 79xx (7912) Description

The LM79XX series of three-terminal negative regulators are available with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shutdown and safe operating area protection, making it essentially indestructible

Features IC LM7912

• Output Current in Excess of 1A

• Output Voltages of -5, -6, -8, -9, -10, -12, -15, -18 , -24V

• Internal Thermal Overload Protection

No external components required

• Short Circuit Protection

• Output Transistor Safe Operating Area Compensation

Absolute Maximum Ratings IC LM7912

Input Voltage (VO = -5V, to 15V) : 35V

Operating Temperature Range (TA) : 0°C to +70°C

Maximum Junction Temperature : 150°C

Storage Temperature Range −65°C to +150°C

Lead Temperature (Soldering, 10 sec.)

Skema 10 volt Regulator menggunakan IC LM723

noreply@blogger.com (Anonymous) — Mon, 30 Apr 2012 10:52:00 -0700

This is a circuit of an IC LM723 voltage regulator. This IC has a voltage reference source, an error amplifier, a series pass transistor, and a current limiting tran sistor all contained in one small package. The device can be connected to operate as a positive or negative voltage regulator with an output voltage ranging from 2 V to 37 V, and output current levels upto 150 m A. The maximum supply

voltage is 40 V, and the line and load regulations are each specified as 0.01%.

IC regulator LM 723 connected to operate as a positive voltage regulator. The output voltage can be set to any value between approximately 7 V (reference voltage) and 37 V by appropriate selection of resistors R1 and R2. A potentiometer may be included between R1 and R2, of course, to make the voltage adjustable. An external transistor may be Darlington connected to Q1 (as shown in earlier post) to handle large load current. The broken lines in the figure shows connections for simple (non-foldback) current limiting. (Foldback current limiting can also be used with IC LM723). A regulator output voltage less than the 7 V reference level can be obtained by using a voltage divider across the reference source [terminals 6 and 7 in earlier figure]. The potentially divided reference voltage is then connected to terminal 5.

It is important to note that the supply voltage, at the lowest point on the ripple waveform, should be at least 3 V greater than the output of the regulator and greater than VREF; otherwise a high-amplitude output ripple may occur.

Paramaters IC Regulator lm723
Output Current 150 mA
Output Voltage Undefined Volt
Input Min Voltage 9.5 Volt
Input Max Voltage 40 Volt
Adjustable Output Yes
On/Off Pin No
Error Flag No
Temperature Min -55 deg C
Temperature Max 150 deg C.

Skema 12 Volt Battery Monitor by IC LM3914

noreply@blogger.com (Anonymous) — Mon, 30 Apr 2012 10:42:00 -0700

This circuit makes it posible to monitor the charging process to a higher level. Final adjustsments are simple and the only thing needed is a digital voltmeter for the necessary accuracy. Connect an input voltage of 12.65 volt between the positive and negative poles and adjust the 10K trimmer potentiometer until Led 10 lights up. Lower the voltage and in sequence all other Led's will light up. Check that Led 1 lights up at approximately 11.89 volts.

At 12.65 volt and higher the battery is fully charged, and at 11.89 is considered 'empty'. This circuit, with the components shown, uses less than 10mA. Ofcourse you can adapt this circuit to your own needs by making small modifications. The circuits above is set for 'DOT' mode, meaning only one Led at a time will be lit. If you wish to use the 'BAR' mode, then connect pin 9 to the positive supply rail, but obviously with increased current consumption. The LED brightness can be adjusted up- or down by choosing a different value for the 4K7 resistor connected at pin 6/7.

Skema Regulator Variable Sederhana

noreply@blogger.com (Anonymous) — Mon, 30 Apr 2012 10:27:00 -0700

Skema Regulator Variable Sederhana A simple but less efficient method of controlling a DC voltage is to use a voltage divider and transistor emitter follower configuration. The figure below illustrates using a 1K pot to set the base voltage of a medium power NPN transistor.

The collector of the NPN feeds the base of a larger PNP power transistor which supplies most of the current to the load. The output voltage will be about 0.7 volts below the voltage of the wiper of the 1K pot so the output can be adjusted from 0 to the full supply voltage minus 0.7 volts. Using two transistors provides a current gain of around 1000 or more so that only a couple milliamps of current is drawn from the voltage divider to supply a couple amps of current at the output.

Note that this circuit is much less efficient than the 555 timer dimmer circuit using a variabe duty cycle switching approach. A fairly large heat sink is required to prevent the PNP power transistor from overheating. The advantage of the circuit is simplicity, and also that it doesn't generate any RF interference as a switching regulator does. The circuit can be used as a voltage regulator if the input voltage remains constant.

Tips cara menghemat listrik

noreply@blogger.com (Anonymous) — Sun, 11 Mar 2012 17:33:00 -0700

Buat yang mau mencoba hemat pemakaian listrik di rumah, ada rangkuman tips dari berbagai sumber yang bisa membantu untuk penggunaan alat rumah tangga sehari-hari. Mudah-mudahan ada hasilnya di rekening akhir bulan nanti..

Lampu Penerangan

1.Pilih lampu yang daya dan ukurannya sesuai dengan kebutuhan.
2.Manfaatkan cahaya alami yang optimal
3.Lampu dan rumah lampu dijaga agar selalu bersih
4.Pilih lampu hemat energi
5.Sesuaikan jumlah titik dan daya (Watt )
6.Bila ada, gunakan listrik tenaga surya terutama untuk penerangan luar atau lampu taman
7. Kurangi pemakaian lampu 2 x 25 watt pada pukul 17.00-22.00

Lemari Es

1.Pintu lemari es harus selalu ditutup rapat dan dibuka seperlunya
2.Jangan memasukan makanan dan minuman yang masih panas ke dalam lemari es
3.Jauhkan lemari es dari sumber panas
4.Isilah lemari es secukupnya
5.Bersihkan kondensor secara teratur, setidaknya 1 tahun sekali
6.Periksa karet disekitar pintu kulkas. Hilangkan sisa makanan yg membeku sehingga tidak merusak
7.Jika pergi berlibur dalam waktu yang cukup lama, bersihkan lemari es dan matikan aliran listriknya

AC (Air Conditioning)

1.Matikan AC bila ruangan tidak digunakan
2.Atur suhu ruangan sesuai kebutuhan
3.Hindari kebocoran udara luar
4.Pakailah timer switch untuk mengatur pemakaian sesuai kebutuhan

Alat Pemanas

Hindari penggunaan alat pemanas listrik kecuali setrika, namun bila terpaksa perhatikan hal-hal berikut :
1.Gunakan alat pemanas hanya pada saat benar-benar diperlukan
2.Pemanas air dengan LPG jauh lebih hemat energi
3.Gunakan pemanas air tenaga surya yang bebas biaya energi
4.Gunakan peralatan pada siang hari
5.Pilihlah ukuran yg sesuai dengan yang diperlukan
6.Bersihkan kantong debu segera setelah digunakan

Mesin Cuci

Gunakan mesin cuci sesuai dengan kapasitasnya, isi air sesuai petunjuk
Hindari penggunaan pengering listrik, gunakan panas matahari untuk pengeringan secara alami
Sebaiknya ditentukan jadwal untuk mencuci 2 atau 3 hari sekali.Semoga bermanfaat

Hidden Car Hire Costs

noreply@blogger.com (Anonymous) — Sat, 10 Dec 2011 06:28:00 -0800

Renting a car is sometimes dangerous if you are not careful enough. For examplecar hire companies abroad will try to flog you all sorts of unnecessary extras when you arrive at the airport, and it’s easy to be caught out - particularly if you’re jet-lagged or have fractious children in tow.
The hidden costs starts with the car itself. Some companies will try to persuade you to upgrade or fob you off with one you did not order. When you book online you will usually have to choose the size of car, but holidaymakers can be told the car may not be big enough and they will be advised to get a bigger model at extra cost. If you don’t get what you paid for then the car hire firm is breaching the contract. You are entitled to claim back any extra costs of getting what you were initially promised.
Most car rentals include some level of insurance - usually called a ‘collision damage waiver’ - but will carry an excess that you must pay yourself if you make a claim.
Many companies will offer you added insurance to cut your liability to a much smaller amount - typically between £50 and £100. This can be called the ’super collision damage waiver’ or ‘damage excess insurance’.
According to a recent report, this will cost up to £10 a day for a small or compact car, but even if you pay this, the windscreen, wheels, tyres, roof or undercarriage of the vehicle may not be covered. ‘You need to make a judgment call,’ adds Mr Crowder. ‘You may feel that paying an extra amount to protect yourself in the unlikely event of making a claim may not be worth it.’
You’ll also pay through the nose for fuel if you’re not careful. Some car rental firms give you the option of buying a full tank from them and returning it empty, or paying for the petrol you use. Both of these can work out much more expensive. The best option is taking a full tank of petrol and filling it up when you return the car. You may need to plan to have enough time to full the tank.
And then there is damage to the car. Less scrupulous rental firms will try to make you cough up for damage you didn’t cause, so make sure you check the condition of the car before you drive off.
We recommend you mark any damage - no matter how small - on the car diagram that comes with the contract and get the salesman to agree with your notes. If there is more than one driver make sure you specify this when booking, as some firms charge high rates if you add more at the airport.
In short, when you get home check your credit card to make sure extra charges haven’t been slipped on to your bill.

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