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Statistics |
| Unique Visitors: 2276 |
| Total Unique Visitors: 15530416 |
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| Total Visitors Out: 59377 |
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| 10 LED VU Meter Using IC LM3914 |
| 2012-01-24 11:42:00 |
This 10 LED VU meter circuit has only a few parts but is useful as an indicator for the measurement of entering acoustic signals. The circuit is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear outLM3914 VU Meter Circuit The circuit is built around an LM3914 IC. The input signal from the VU meter is put on pin 5 of IC1. Through pin 9 of IC1 is the display mode sets (bar or dot instructions). In the drawn state IC1 works in the dot mode. When pin 9 is coupled to pin 3, the IC works in bar mode. Obviously the whole circuit consumes less power in dot mode. List ComponentC1 : 2.2uF/ 25V Electrolytic CapacitorR1 : 1K ResistorD1 : 1N4002 DiodeLED1-LED : 10 x LED or LED ArrayU1 : LM3915 NotesV...
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| Rangkaian Pendeteksi Angin |
| 2011-11-15 16:47:00 |
This circuit uses an incandescent lamp to detect airflow (mendeteksi angin). With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus lowering it's resistance. A comparator is used to detect this difference and light an LED. With a few changes, the circuit can be connected to a meter or ADC to provide an estimation on the amount of air flow. Rangkaian Pendeteksi AnginLM339 PinoutThe glass will have to be removed from L1 without breaking the filament. Wrap the glass in masking tape and it in a vise. Slowly crank down until the glass breaks, then remove the bulb and carefully peel back the tape. If the filament has broken, you will need another lamp.Lis...
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| Stepper Motor Controller using IC 4027 |
| 2011-11-15 16:17:00 |
The stepper controller circuit is very interesting, since most lines the step motor controllers are very expensive. The circuit is made of standard components and can easily be adjusted by a computer. If you cheap surplus transistors and stepper motors, the price of the circuit can be less than $ 15.Stepper Motor Controller Circuit using IC 4027This stepper controller circuit shown here can used to control the unipolar stepper motor, the which has four coils. The stepper controller circuit can drive for a motor current of up to about 500 MAMP / Winding by Suitable heat sinks for the SL-100 In higher currents seem 2N3055 power transistors can be used as darlington pair along with the SL-100. All diodes are used to protect the transistor from back current transients.List ComponetR1, R2...
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| Ukuran Box Subwoofer 10" |
| 2011-10-29 16:54:00 |
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.Note: 10" 4 ohm subwoofer O-Audio 500 Watt plate amplifier Freq Response: 25Hz up to chosen x-over point. Overall Dimension: 21"x 12.75"x 20"For more details on how to make it please read more http://diyaudioprojects.com/Speakers/HiVi-DIY-Subwoofer/...
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| 4,8W Class-A MOSFET Amplifier |
| 2011-10-29 16:10:00 |
This is very simple Class-A 2SK1058 MOSFET Amplifier circuit. It is easy to build it, Must use supply volte 24V at high current. It produces the most purest sound. I have no idea of distortion levels etc. but it has a very fine grain, and delicately textured quality.Skema Rangkaian 4,8W Class-A MOSFET AmplifierThis is one package 2SK1058 N-Channel MOSFET Pin DiagramThe four resistors are 15ohm and 10W each the which I wired two in series for 30 ohms and then the two sets of 30 ohms are wired in parallel to give a total resistance of 15 ohms. These get extremely hot and burn about 30W at idle.For more detail please read more http://diyaudioprojects.com/Solid/ZCA/ZCA.htm...
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| Rangkaian Power Amplifier Blazer 1000 Watt |
| 2011-06-09 15:28:00 |
This is a audio power amplifier Blazer circuit provides up to 1000Watt . This interesting routes many good bass and treble alive. Importantly should choose Power supply source, which has been fairly high voltage class 70Vdc GND -70V 10A is the current low levelSkema Rangkaian Power Amplifier Blazer 1000 WattThe transistors are 2SC3858 (NPN) and 2SA1494 (PNP), and feature high bandwidth, excellent safe operating area, high linearity and high gain. Driver transistors are 2SC5200 (NPN) and 2SA1943 (PNP). All devices are rated at 230V, with the power transistors having a 150W dissipation and the drivers are 50W.This circuit describes an amplifier, power supply and tests procedures that are all inherently dangerous. Nothing described in this article should even be considered unless you are full...
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| 500 Watt Inverter 12VDC to 220VAC |
| 2011-06-07 07:29:00 |
The circuit of 500 Watt Inverter 12VDC to 220VAC is made using a transistor. central component of this inverter circuit is a configuration of 2 pieces of transistors Q1 and Q2 which form a circuit of Flip-Flop. The output of the flip-flop Q1 and Q2 then in severance for each pulse to complement each other using a compiled circuit by Q3 and Q4. Output which complement each other is then given to the driver transistors Q5 and Q6 form the transistor 2SC1061. Power Inverters of this circuit is composed using parallel transistors Q7, Q8 and Q7x, Q8x a form of 2N3055 power transistor 10 pieces. schematic a complete of Inverter 500 Watt circuit can be seen as follows.Skema Rangkaian 500 Watt Inverter12VDC to 220VACStep up part of this inverter circuit using a transformer 12VCT/500VA in secon...
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| 12VDC – 220VAC Inverter Using Cmos CD4047 |
| 2011-06-07 06:45:00 |
This inverter circuit will convert 12V DC power from battery to 22oV AC as home power replacement. The inverter can be used for small electronic appliances such as lamp, radio, phone charger, disk player etc.Skema Rangkaian 12VDC – 220VAC InverterUsing Cmos CD4047CD4047 PinoutThe inverter circuit has a central component, the CMOS 4047, and converts a 12V DC voltage to 220V AC voltage. 4047 is utilised as a astable multivibrator. At pin 10 and 11 we find a rectangular symmetrically signal which is amplified by tow Darlington transistors T1 and T2 and finally reaches the secondary coil of a transformer network (2 x 10V/100VA). Primary coil terminals voltage is 220 alternative voltage. To obtain a better performance use a toroidal core transformer with reduced losses. With P1 the output fr...
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| Light/Dark Switch With Relay |
| 2011-05-18 15:36:00 |
The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay.Light/Dark switch Circuit with relayAs you may have notice, the 741 is connected as a voltage comparator. Two voltage dividers are easy to be found: The first one is the10K resistor and the LDR . The second one is composed by the two 470 Ohms resistors and the potentiometer. Both the outputs of the dividers are connected as inputs to the voltage comparator.The second voltage divider will settle the reference voltage. The first voltage comparator that contains the LDR, will change it's voltage a...
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| Refrigerator Door Alarm Circuit Using LDR |
| 2011-05-18 14:28:00 |
The alarm circuit enclosed into a small box is placed in the refrigerator near the lamp. With the door closed the interior of the refrigerator is in the dark, the LDR R2 presents a high resistance thus clamping IC1 by holding pin 12 high. When a beam of light enters from the opening, or the refrigerator lamp illuminates, the LDR lowers its resistance, pin 12 goes low, IC1 starts counting and, after a preset delay (20 seconds in this case) the piezo sounder beeps for 20 sec. then stops for the same lapse of time and the cycle repeats until the refrigerator door closes. D2 connected to pin 6 of IC1 allows the piezo sounder beeping 3 times per second.Skema Rangkaian Refrigerator Door Alarm Using LDRNote:Delay time can be varied changing C1 and/or R3 values.Quiescent current drawing is neglig...
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