Wednesday, December 28, 2016

Static Zero to Nine Display Circuit using 7490 and 7446 ICs

Electronic Kit School. - There are many electronic device using display to indicate some activity or quantity when work. It is look like when we go to the trafict light, we will find that there is seven segment display to show up to down timer for waiting.

It also make many electronic circuit to result display with many device like LCD, 7 segment, dot matric and other. In here we will show you limit display for static 0 to 9 diplay using 7 segment driven by two TTL ICs like 7490 and 7446 look like in Figure 1 below.

Circuit 

  1. Seven Segment Common Anode
  2. IC 7490
  3. IC 7446
  4. Resistors
Description

Circuit like in Figure 1 above show you about the Static Zero to Nine Display Circuit using 7490 and 7446 ICs. From Circuitstoday site describe that the circuit above is one of the simple 0 to 9 display that can be employed in many applications. The circuit is based on asynchronous decade counter 7490, a segmen segment display (D1), and a seven segment decoder/driver IC 7446.

The usual seven segment display consists of 7 LEDs labelled ‘a’ through ‘g’. By forward biasing different LEDs, which can display the digits zero through nine. Seven segment displays are of two types, common cathode and common anode. In common anode type anodes of all the seven LEDs are tied together, while in common cathode type all cathodes are tied together. The seven segment display used here is a common anode type .Resistor R1 to R7 are current limiting resistors. IC 7446 is a decoder/driver IC used to drive the seven segment display.

Working of this circuit is very simple. For every clock pulse the BCD output of the IC2 (7490) will advance by one bit. The IC1 (7446) will decode this BCD output to corresponding the seven segment form and will drive the display to indicate the corresponding digit.

Thursday, December 15, 2016

200-250 Milliwatts Long range FM Transmitter Circuit

Electronic Kit School. - There are many electronic circuit designed to give best result for FM transmitter with special range like for 87.5MHz to 108MHz for commercial radio transmitter and also 144MHz for community radio transmitter. The output power also many kinds depending the booster used. There are also FM transmitter circuit designed with many range frequency with low output power like the circuit of 200-250 Milliwatts Long range FM Transmitter shown in Figure 1. below.

In this moment we will show you one circuit of 200-250 Milliwatts Long range FM Transmitter Circuit that may useful for you who want to get this device. So, the main component in this circuit are transistor, capacitor, and inductor.

Circuit 

  1. Condenser MIC
  2. Resistors
  3. Capacitors
  4. Inductors
  5. Transistors
  6. Varicap Diode
Description

Circuit like in Figure 1 above show you about the 200-250 Milliwatts Long range FM Transmitter Circuit. From ElectronicsZone site describe that the power output of most of these circuits are very low because no power amplifier stages were incorporated.

The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milliwatts. With a good matching 50-ohm ground plane antenna or multi-element Yagi antenna, this transmitter can provide reasonably good signal strength up to a distance of about 2 kilometres.

The circuit built around transistor T1 (BF494) is a basic low-power variable-frequency VHF oscillator. A varicap diode circuit is included to change the frequency of the transmitter and to provide frequency modulation by audio signals. The output of the oscillator is about 50 milliwatts. Transistor T2 (2N3866) forms a VHF-class A power amplifier. It boosts the oscillator signals? power four to five times. Thus, 200-250 milliwatts of power is generated at the collector of transistor T2.

For better results, assemble the circuit on a good-quality glass epoxy board and house the transmitter inside an aluminium case. Shield the oscillator stage using an aluminium sheet.

Friday, December 9, 2016

Electronic Circuit Software: KiCad EDA for Circuit Design for Windows, MAC OS X, and Linux

ElectronicKitSchool. - This is one of free electronic circuit design software that called with KiCad EDA for Circuit Design for Windows, MAC OS X, and Linux. So, for you as the professionals, hobbyists and students in electronic field can use this software to create your electronic project now.

Image Courtesy of Listoffreeware

In this time we will give you global description about this electronic design software that called with KiCad EDA and then the last we will give you the link to take free download KiCad EDA for Circuit Design for Windows, MAC OS X, and Linux from external software.

Description

From the Listoffreeware of this KiCad EDA  is a cross platform circuit design software for Windows, MAC OS X, and Linux. To design a circuit you will have to create a new project and open the Schematic Editor. Opening a new project creates a new directory. Go to the Schematic Editor tab and begin designing. Click on the Place Component option to select a part and place it on  the designing area. These components include: Microchip, Memory, Display, Audio device, Xilink, Power, Transistors, DSP, and many more. Add more components like: Ground, Wire, Bus, Junction, etc. to connect the main components.

Save the designed sheet, which you can find in the directory you created. Render grids on the sheet, and change cursor pointer to help you design circuit easily. Print option lets you Preview and Print the designed sheet directly from this circuit design freeware.

The Schematic Library Editor lets you edit and change the properties of various components. Click on PCB Editor tab to design printed circuit board. With the help of PCB Footprint Editor, you can add footprint to PCB according to various components. A Bitmap2Component converter, and a PCB Calculator are also available in this software.
Download Software

And now you can click the icon link below to continue download KiCad EDA for Circuit Design for Windows, MAC OS X, and Linux from external source.

KiCad EDA for Circuit Design for Windows, MAC OS X, and Linux

Saturday, December 3, 2016

Gauss Meter Circuit using Halleffect Sensor SS49E and a Linear Voltage Regulator Chip LM78L05

Electronic Kit School. - Maybe when you said about Gauss meter device, you will feel that this device is an expensive and there are many electronics hobbyist can not reach it. But, don't worry to design this device with cheaper money using combination of Halleffect Sensor SS49E and a Linear Voltage Regulator Chip LM78L05 like in Figure 1. below.

In this moment we will show you one circuit of Gauss meter using Halleffect Sensor SS49E and a Linear Voltage Regulator Chip LM78L05 that may useful for you who want to get this device. So, the main component in this circuit is Halleffect Sensor SS49E and a Linear Voltage Regulator Chip LM78L05.

Circuit 

  1. Halleffect Sensor SS49E IC
  2. Linear Voltage Regulator Chip LM78L05
  3. Resistors
  4. Capacitors
  5. Jumper
Description

Circuit like in Figure 1 above show you about the Gauss meter circuit using Halleffect Sensor SS49E and a Linear Voltage Regulator Chip LM78L05. From Electroschematics site describe that here is the simplistic design of an inexpensive gauss meter that can teach you about the strength of magnets. This construct is based on the easily-available SS49E Hall effect sensor from Linear Technology. This is an affordable DIY project presented as a design idea for further refinement and optimizing of the basic concept by way of experiment.

The SS49E Linear Hall effect sensor is a versatile device that’s operated by the magnetic field from a permanent magnet or an electromagnet. The linear sourcing output voltage is set by the supply voltage and varies in proportion to the strength of the magnetic field. The “UA” package that’s easiest to work with is called the Single Inline Package (SIP), which allows you to easily plug into a breadboard or solder into a veroboard.