The PIC Based servo controller is a small project that allow you to control some robotics. The project uses a PIC16F84 microcontroller from Microchip to drive servo motors and digital outputs. It receives commands from a host computer via a standard RS232 serial interface.

To control the servos and outputs we need to send commands to the PIC. Some of the commands are single byte commands; some however require two bytes. The first byte always contains the command and the channel to which the command applies. We will call this the ‘Command’ byte. The second byte (when needed) will contain data for the command; we will call this the ‘Data’ byte and is used when we need to set the servo offset or position for example, said Ashley Roll, the designer.

The command byte is split into two nibbles (4 bits), the upper one defines the command to execute and the lower defines the channel (which servo or digital output) is to be affected.

PIC program | Schematic

To know more about Flexplay DVDs, you must also know the working of a normal DVD. Click at the link below to know more.
TAKE A LOOK : WORKING OF DIGITAL VERSATILE DISC (DVD)
What is Flexplay DVD?
In most foreign countries, people rent a lot of DVD’s from the shop. All you have to do is watch [...]

Good stability and sufficient amplification in Transistor based circuits depends on the proper selection of components and their layout. Gain of the transistor used as well as the current and voltage through it are the most important aspect in the working of a transistor amplifier. Here explains the design parameters of an one transistor amplifier More >

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Transistor Amplifier Design

This is dark activated circuit diagram.But the importance of this circuit is the size of this circuit.Here I have used famous transistor 2N3904.Here I have used photo transistor.

Transistors are inevitable parts of Electronic circuits. The success of a circuit design lies in the selection of proper transistor type and calculation of voltage and current flowing through it. A small variation in the voltage or current level in the transitor will affects the working of the whole circuit. Here explains how a transistor More >

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Transistor Circuit Design

Regulated power supply is necessary in some electronic circuits especially in Amplifier circuits. Poorly regulated power may cause buzzing and unwanted noise in RF and amplifier circuits. There are two methods to get regulated power supply. The most common and simple one is Zener regulated power supply. A Regulator IC of 78 XX series or More >

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Power Supply Regulation

Here is a simple tester for Hobbyists. This LED Component tester can test the integrity of electronic components from resistors to ICs before soldering. It reduces the job of testing the components using multimeter. The tester gives LED indications about the Good or Bad conditions of the components. A White LED torch is added to More >

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LED Component Tester with Torch

Voltage and Current divider arrangements are the common in electronic circuits. Before selecting the value of resistors, it is necessary to calculate the voltage and current from the output of a resistor chain. So that the circuit will function properly. Here is a simple but useful tip to calculate the voltage and current More >

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Voltage and Current Divider

This simple circuit tells you about the status of phone such as Line OK, Dialing and Call attended. It also has a lock facility to block outgoing calls keeping the incoming calls as usual. This prevents misuse of telephone. The circuit uses only a few components to do all these jobs

The circuit is directly connected More >

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Telephone Status Indicator

This is a Fm Transmitter circuit.This circuit can Transmit signals up to 200M.L1 is 1mH inductor.When I built this circuit I used PCB.

Note

# Make inductor with the support of this formular L = (d²n²) / (18d+40l)

L is the inductance of the coil in uH
d is the coil diameter in inches
l is the coil length in inches
n is the number of turns

# Use 12V power supply for this circuit.

# Build this circuit on a PCB