4 Transistor 500mW FM Transmitter Circuit DiagramAs shown, the audio ascribe is a microphone, which uses 2 x 2N3904 as the microphone audio preamplifier. The audio/mic ascribe akin is adjustable by agency of a 5k preset / potentiometer. The ambit uses a Colpitts oscillator for abundance generation, which is chargeless active and operates at the axiological abundance i.e....
Thursday, 20 November 2014
Class B audio amplifier based on TDA1553
Here is the circuit of a Class B audio amplifier based on TDA1553. TDA1553 is a monolithic audio amplifier class B, containing 2 x 22 watt amplifier in bridge configuration load attached. The amplifier operates from 12V DC and develops intentionaly for car audio applications. The IC also has a lot of good features such as short circuit protection, protection of the load dump,...
Auto Sound Systems are Becoming Entertainment Systems
If youve been shopping lately for an auto sound system then I am fairly certain that youve come across several full entertainment systems among those in the running for your audio and entertainment dollars. Vehicles today offer everything from DVD players, individual speakers, headphones (also individually adjustable), and even dual players that will allow one different audio...
Wednesday, 19 November 2014
Smart Tracker track anything from your child to shoes
The EPE Minder consists of two type- approved transmitter units and a receiver. If either transmitter becomes separated from the receiver, a buzzer in the latter part will sound. The receiver is fitted with a switch to allow the use of only one transmitter if required.MIND HOW YOU GOThis system was originally designed as a two-channel child alarm (to protect either a single child or two children at the same time) but many other applications spring...
NE555 IC Timer
The 555 Timer is an integrated circuit (chip) implementing a variety of timer and multivibrator applications. The IC was designed and invented by Hans R. Camenzind. It was designed in 1970 and introduced in 1971 by Signetics (later acquired by Philips). The original name was the SE555/NE555 and was called "The IC Time Machine".The 555 gets its name from the three 5-k Ohm resistors...
AT89C2051 microcontroller circuit
Real time controller AT89C2051Real time controller is a device used to exercise control over household device continuously ongoing and scheduled. The series of Real Time Controllers with microcontroller AT89C2051 which dituls in this article is a tool that can do that serve targeted. The series of Real Time Controller with Microcontroller AT89C2051 Atmel AT89C2051 uses a data...
Tuesday, 18 November 2014
Toggle switch with Infra Red IR
Toggle switch in this article is a series of toggle switches that are controlled by infrared light. The series toggle switch is made from a combination of data flip-flop CD4013 2 units. Receiver circuit of the infrared light signals arranged with infrared receiver as found on television remote receiver. Infrared signal from remote is used as clock signals and data to the data...
ADC 207 Flash Converting
Flash Converting - ADC 207ADC 207 is the first to use Flash Converting An Advanced High Speed VLSI 1.2 micron CMOS process. The process that is able to do the ADC 207 as mentioned earlier is very great and makes the ADC 207 is unique. The speed of the process of this ADC has a good linearity and have a stable temperature. ADC 207 has a lower power consumption is 250 mW....
1000W ICs audio amplifier with PA03
This is a series of amplifiers are based on the most high-ic power that I have ever known. Because the output is issued up to 1000 watts with the impedance RL 4Ohm. Current supply 120mA, and 30A output current. Minimum input voltage of about 30V and a maximum voltage up to 150V. This is an audio amplifier that I have come across use ICs that maximum voltage up to 150V and...
Monday, 17 November 2014
Transceiver Homebrew QRP SSB 80M Band
Radio communication transceiver is a radio transmitter at the same time the plane doubles as a radio receiver used for communication purposes. It consists of the transmitter and the receiver are assembled in an integrated way. In mulamula generation, the transmitter or receiver or transmitter and receiver sections are assembled separately and is part of a stand sendirisendiri...
100W Audio Amplifier with TDA7294
TDA7294 is an integrated, monolithic, Class AB audio amplifier designed precisely for Hi-Fi applications. The IC has a DMOS output stage and can deliver 100W RMS into an 8Ohm speaker at +/-38V dual supply.In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. C8 is the input coupling capacitor and the input is applied...
18W Amplifier Schematic Circuit
18W Amplifier Schematic Circuit Part List P1_____________22K Log. Potentiometer (Dual-gang for stereo) R1______________1K 1/4W Resistor R2______________4K7 1/4W Resistor R3____________100R 1/4W Resistor R4______________4K7 1/4W Resistor R5_____________82K 1/4W Resistor R6_____________10R 1/2W Resistor R7_______________R22 4W Resistor (wirewound) R8______________1K 1/2W Trimmer...
Speed Fan Control Circuit using IC CD4017B
Speed Fan Control Circuit using IC CD4017B Circuit The simple abstraction activity is use IC CD4017 to ascendancy 4 relays which affix anniversary pole. IC CD4017B which is counter-cum-1kHz decoder and the arresting is disconnected into ten according intervals, Which can be programmed, via the distinct location, 10-mode. According to the backward advertisement of the continuance...
Sunday, 16 November 2014
Fire Alarm LDR
Fire alarm can be made with a light sensor (LDR) as in the article with the title of Fire Alarm with this LDR sensor. Principles of fire detection Fire Alarm with LDR sensor is to detect the presence of smoke through the LDR. LDR in the series Fire Alarm does not stand alone in detecting a fire, but the LDR in the pair with the light shining on the LDR. Hence, in the detected...
Friday, 14 November 2014
OBSTACLE AVOIDING ROBOT
This is a simple obstacle avoiding robot with two wheels that can be fabricated using a handful of generally available and inexpensive discrete components. The robot can perform avoidance manoeuvres whenever it detects an obstruction in its path. The electronic part is simple and can be built on a small piece of prototyping board. Although not terribly complicated, the mechanics...
FREQUENCY TO VOLTAGE CONVERTER CIRCUIT
A very simple and low cost frequency to voltage converter based on the TC9400 IC from Microchip is shown here. TC9400 can be either wired as a voltage to frequency converter or frequency to voltage converter and it requires minimum external components. The functional blocks inside the TC9400 includes integrator opamp, 3uS delay circuit, one shot circuit, charge discharge control...
27MHz Transmitter Receiver Radio Control PCBs and Schematic Diagram
This article provides information about 27 MHz Transmitter-Receiver Radio Control related to its PCB assembly/construction. The picture below shows the schematic diagram of the transmitter using IC TX2B. You will be explained with the instruction for constructing the PCBs (assembly, tuning, transistors, IC, resistors, capacitors (Disk Ceramic, Metallised Polyester, Electrolytic))...
Thursday, 13 November 2014
Valve Sound Converter
‘Valve sound’ is not just an anachronism: there are those who remain ardent lovers of the quality of sound produced by a valve amplifier. However, not everyone is inclined to splash out on an expensive valve output stage or complete amplifier with a comparatively low power output. Also, for all their aesthetic qualities, modern valve amplifiers burn up (in the full sense of...
2N3904 Transistor datasheet Diagram Circuit Emitter Follower Circuit Diagram
The schematic shown below diagrams the emitter follower circuit using 2N3904, an NPN silicon bipolar junction transistor. In the circuit provided, input signal is applied to the base of the transistor, but the output is taken from the emitter.Instead of using 2N3904 transistors, this emitter follower circuit uses such parameters: 40V collector to emitter voltage (Vce), 6V...
150W LM12 based audio amplifier circuit with explanation
LM12 operational amplifier can output currents up to 10A. The LM12 in encapsulated in TO-3 with 4 pins, can support up to 800W and has enough internal protections to prevent slacks from over-currents or over-heating.You can use LM12CL with 30 V maximum voltage or LM12C with 40V maximum.The L1 coil has 40 turns 1mm copper, coiled over R4. If you use LM12CL it is recomended...
Wednesday, 12 November 2014
TDA2822 Integrated Amplifier Circuits General
General integrated amplifier circuit external components and need more larger heatsink. This paper presents a simple amplifier circuit, made easy. TDA2822 amplifier integrated circuits used in music players, portable DVD and other audio playback; power is not great but you can satisfy the requirements of the hearing, and the circuit is simple, good sound quality, wide voltage...
LA3161 based Preamplifier circuit with explanation
Preamplifiers are used to amplify low level signals such as those from mikes, tape heads before they are fed into power amplifiers. Power amplifiers are generally less sensitive. Frequency response also can be suitably trimmed and modified at preamp stage. LA 3161 is one of those widely used in tape decks and amplifiers as a stereo preamplifier. Block Diagram is shown in...
Light Sensitive Staircase Switch with Triac
When there is no sufficient light/the reset pin is held low by R14 (4.7K resistor) and the circuit works as it is described in the earlier paragraph. But if there is sufficient light, resistance of LDR goes low and the transistor goes into conduction. Now the reset pin goes high and the circuit cannot work. R16 is the sensitivity adjustment. You may use a different color of...
Tuesday, 11 November 2014
LM317T based Voltage Regulator with Pass Transistor circuit
Here is the circuit diagram for LM 317 T voltage regulator with pass transistor...
SP LED Flashlight Using Supercapacitor
Bored of joking with capacitors? Then its time for you to maneuver on to super-capacitors. These have huge storage capabilities. during this article you may conclude the way to build atiny low LED flashlight using supercapacitors.The most disadvantage of capacitors is their giant voltage drop. For this project, a minimum voltage of two volts is needed to light-weight the LED....
Sunday, 9 November 2014
Contrast Controller Circuit Diagram For LCDs
The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to be repeatedly adjusted. Very awkward, in other words. The circuit described here offers a solution for this problem. The...
Saturday, 8 November 2014
Motor Turn Stall Detector Circuit Diagram
In single phase AC induction motors, often used in fridges and washing machines, a start winding is used during the starting phase. When the motor has reached a certain speed, this winding is turned off again. The start winding is slightly out of phase to the run winding. The motor will only start turning when the current through this winding is out of phase to that of the...
Intelligent Presence Simulator
However effective a domestic alarm system may be, it’s invariably better if it never goes off, and the best way to ensure this is to make potential burglars think the premises are occupied. Indeed, unless you own old masters or objects of great value likely to attract ‘professional’ burglars, it has to be acknowledged that the majority of burglaries are committed by ‘petty’...
