Monday, February 23, 2015

100 Electronic Circuits in One


100 Electronic Circuits in One
Download All in One Link 

Circuits Include in This Group
~~~
1.  Crystal-Controlled Time-Base Generator
2.  2-Line Intercomcum-Telephone Line Changeover Circuit
3.  7mhz Cw/Am Qrp Transmitter
4.  Infrared Toy Car Motor Controller
5.  Mains Manager
6.  40-Metre Direct Conversion Receiver
7.  A Hierarchical Priority Encoder
8.  Accurate Electronic Stop-Watch
9.  7mhz Cw/Am Qrp Transmitter
10.             Add On Stereo Channel Selector
11.             Anti Theft Security
12.             9 Line Telephone Sharer
13.             Audio-Visual Extra Ringer For Phone
14.             Dual-Channel Digital Volume Control
15.             Infrared Cordless Headphone
16.             Auto Reset Over/Under Voltage Cut-Out
17.             Clock Timer
18.             Medium-Power Fm Transmitter
19.             15 Step Digital Power Supply
20.             Battery-Level Indicator
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21.             Ir Music Transmitter And Receiver
22.             Pc Power Manager
23.             Automatic Emergency Light
24.             Automatic Heat Detector
25.             Automatic Room Power Control
26.             Multi-Melody Generator With Instrumental Effect Sani Theo
27.             Water-Level Controller
28.             Ups For Cordless Telephones
29.             Programmable Led Indicator
30.             40-Metre Direct Conversion Receiver
31.             Mains-Operated Christmas Star
32.             A Hierarchical Priority Encoder
33.             Accurate Electronic Stop-Watch
34.             Add On Stereo Channel Selector
35.             Anti Theft Security For Car Audios
36.             Audio-Visual Extra Ringer For Phone
37.             Dual-Channel Digital Volume Control
38.             Infrared Cordless Headphone
39.             Auto Reset Over/Under Voltage Cut-Out
40.             Auto Shut Off For Cassette Players And Amplifiers
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41.             Automatic Emergency Light
42.             Automatic Room Power Control
43.             Automatic Heat Detector
44.             Automatic Emergency Torch
45.             Automatic Speed-Controller For Fans And Coolers
46.             Automatic Dualoutput Display
47.             Cd-Rom Drive As Digital -Audio Cd-Player
48.             Blown Fuse Indicator
49.             Automatic Temperature Controlled Fan
50.             Drinking Water Alarm
51.             Mobile Shield
52.             Medium-Power Fm Transmitter
53.             Knock Alarm
54.             Glow Plug Controller
55.             Three-Phase Appliance Protector
56.             Flashing Beacon
57.             Led Lighting For Christmas
58.             High-Intensity, Energy-Efficient Led Light
59.             Constant-Current Battery Charger
60.             Battery-Level Indicator
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61.             Guitar Effect Pedal Power
62.             Clock Timer
63.             Pyroelectric Fire Alarm
64.             Versatile Power Supply
65.             Audio Amplifier For Personal Stereo
66.             Dew-Point Sensor
67.             Generator Room Light
68.             Aquarium Probe
69.             Remote-Controlled Fan Regulator
70.             Cash Box Guard
71.             Automatic Low-Power Emergency Light
72.             Ir Music Transmitter And Receiver
73.             Mobile Electronic Workbench
74.             Parrot-Sounding Ac Doorbell
75.             Infrared Bug
76.             Gas Leakage Alarm
77.             Weekly Reminder
78.             Triple Power Supply
79.             Poor Man’s Hea Ring Aid
80.             Pc Power Manager
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81.             Traffic Controller
82.             Digital Timer Enhancement
83.             Wireless Extender For Ir Remote Controls
84.             Solar Panel Based Charger And Small Led Lamp
85.             5-Band Graphic Equaliser
86.             School/College Quiz Buzzer
87.             Remote Control For Home Appliances
88.             Antisleep Alarm For Students
89.             Duophone
90.             Muscular Stimulator
91.             Electronic Metronome
92.             Bell-Cum Light Controller
93.             Smart Laptop Docking Station
94.             Motorbike Alarm
95.             Battery-Level Indicator
96.             Telephone-Operated Calling System
97.             Programmable Timer For Appliances
98.             Automatic Night Lamp With Morning Alarm
99.             Inverter For Soldering Iron
100.         Low-Cost Electronic Quiz Table
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Sunday, March 16, 2014

Programmable LED Indicator


Although IC CD4017 is a decade counter, it can be used in a variety of ways. In this circuit it has been used to program a bicolour LED indicator in 10 different modes which can be selected with a single push-button switch. IC3(555) is used in astable mode to generate square wave and transistor T1 is used to obtain its complementary waveform. IC2 CD4081 is a quad 2-input AND gate. These AND gates and the diode atrix
form the logical part of the circuit. IC4 (555) is configured as a monostable flipflop which provides a single clock pulse to IC1 CD4017 for changing the mode by depression of push-to-on switch S1. The use of IC4 avoids switch debouncing problem which causes multiple makes/breaks.


Switch S2 is included for resetting the circuit. Instead of just one bicolour LED you can use an array of bicolour LEDs in conjunction with two driver transistors. The bicolour (RED and GREEN) LED has three legs. The middle terminal (pin2) LED is the common cathode pin which is grounded when a positive voltage is applied to pin1, it emits red light. Similarly, when positive voltage is applied to pin3, it emits green light. And when positive voltage is simultaneously applied to its pin1 and 3, it emits yellowish light. Power supply used is +5V regulated. Various modes of this circuit are summerised in Table I. Outputs of IC1 can also be selected through a 10-way rotary switch connected to Vcc. Now IC1 can be eliminated. Different indications can be activated for different functions of a device. Construction is very easy and total cost of this circuit is less than Rs 60. Current consumption of the circuit is less than 100mA.

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Antenna Handbook Vol.3 Applications

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Antenna Handbook Vol.2 Theory

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Antenna Handbook Vol.1 Fundamentals and Mathematical Techniques

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Wednesday, March 12, 2014

MULTI-MELODY GENERATOR WITH INSTRUMENTAL EFFECT



This melody generator can generate various English and Hindi tunes as also instrumental effects. Various modes of melodies can be selected through DIP switches. Other advantages are high volume and volume control. IC UM3481A is a 16-pin multi-instrument melody generator. It is a mask-ROM-programmed IC designed to play the melody according to the programmed data. Its inbuilt preamplifier provides a simple interface to the driver circuit. The IC can be replaced with other UM348XXX series, WR630173 or E4822 melody generator ICs. A WR630173 preprogrammed as Hindi melody generator can be used here. There are 16 tunes stored in WR630173 including mera joota hai japani, mera naam chin chin chu, hare rama hare
krishna, raghu pati raghav raja ram and ramaiya vasta vaiya.
The circuit is powered by a 3V battery. Switch S2 is the main input-select switch for producing different tones in the loudspeaker. Various modes of operation are selected through DIP switches S3, S4 and S5 connected to pins 3, 5 and 7 of IC1, respectively. Pin 7 is the envelope circuit terminal through which instrumental effects are produced. The preamplifier outputs are available at pins 10 and 11, which are fed to loudspeaker- driver transistors T1 (SK100) and T2 (SL100), respectively. When you switch on the circuit by closing switch S1, LED1 glows. If DIP switches S3 and S5 are closed and S4 open, pressing input switch S2 will generate a melody tone from the loudspeaker. Vary VR1 to adjust its volume. Pressing S2 again will generate a new melody tone. If switches S3 and S4 are opened while S5 is closed, the same tone keeps repeating for every pressing of S2. The positions of DIP switches and the various modes of melodies are summarised in the table. When switch S5 is open, it will generate an instrumental effect from the loudspeaker. This effect is produced by the enveloping circuit consisting of capacitor C1 and resistor R2 connected to pin 7 of IC1. In fact, by hit and trial you can choose the values of these components as per your taste by listening to the output sound. Only C1 or R2 or its parallel combination can be used to generate a distinct instrument effect. To select any of these options, two jumper terminals J1 and J2 are provided in the circuit at C1 and R2, respectively. For example, if you want to use only C1, you can join J1 terminals using hookup wire or jumper cap and keep J2 open. The repetition of the musical effect depends on the status of switches S3 and S4. The oscillation frequency is produced by the resistor and capacitor connected at pins 14 and 13 of IC1. This frequency is used as a time base for the tone, rhythm and tempo generators.
The quality of the melody tones depends on this frequency. Resistor R6 (100-kilo-ohm) connected to pin 15 makes the circuit insensitive to variations in the power supply.

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Power Electronics Handbook - RASHID, M. H.

Publisher: Academic Press
Number Of Pages: 1000
Publication Date: 2001-08-24
Sales Rank: 613920
ISBN / ASIN: 0125816502
EAN: 9780125816502
Binding: Hardcover
Manufacturer: Academic Press

Power electronics is a broad subject that deals with every aspect of electronic systems and devices. Any computer, machine, controller, game, etc., that is available today is dependent on the power electronics in those systems and devices to operate. Power electronics systems deal with the process of converting electrical power from one form to another. Power Electronics Handbook is specifically designed for the professional engineer in industry and includes contributions of over 60 authors primarily from industry.
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