Do you have a stack of paper slowly building it’s own city in a corner of your garage? The newspaper brick maker creats recycled paper bricks to keep you warm.the brick maker makes compressed wet                      newspaper& drives it into 81/43 that burn at the rate of about four per hour.
Simply soak your newspaper in a [...]

-seismograph is a device used to measure earthquakes.seismographs record a zigzag trace that shows the varying amplitude of ground oscillation beneath it
-the modern seismograph is invented in japan around 1880 by john mine.
-the mercali scale named after Giuseppe mercalli who invented it in 1902 is used to estimate intensially of earthquakes.the following levels [...]

Nanotechnology is defined as fabrication of devices with atomic or molecular scale precision. Devices with minimum feature sizes less than 100 nanometers (nm) are considered to be products of nanotechnology. Fabrication of nanomachines, nanoelectronics and other nanodevices will undoubtedly solve an enormous amount of the problems faced by mankind today.
Nanotechnology is currently in a [...]

We cannot forget 9/11 when 101 people including nine foreigners and 14 policemen have lost their lives while about 300 people were injured in the worst terror attack seen in the country in which desperate men fired indiscriminately at people. our brave solders were Fought against the militants to free all the hostages [...]

This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, Please follow the table (from 20 W to 80 W RMS).

Description:
The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or ?. If their disagreement is bigger than [...]

It’s a high Quality, simple design with 20 to 30V supply.
Circuit Diagram:

Parts:
P1_________________10K Log.Potentiometer (Dual-gang for stereo)
P2________________100K Log.Potentiometer (Dual-gang for stereo) (See Notes)
R1,R2_____________100K 1/4W Resistors
R3,R6______________15K 1/4W Resistors
R4_________________10K 1/4W Resistor
R5_________________22K 1/4W Resistor
R7__________________1K 1/4W Resistor
R8________________560R 1/4W Resistor
C1,C2,C5____________2?2 63V Electrolytic Capacitors
C3________________470?F [...]

Circuit Diagram:

Parts Lists:
R1 = 1k
R2 = 470k
R3 = 10k
R4 = 5k1
R5 = 4k7
R6,7 = 100k
R8,9 = 1M
R10 = 10R
C1-10 = 100nF/63V
C11 = 47nF/63V
E1,4 = 220uF/16V
E2 = 4u7F/16V
E3 = 22uF/16V
IC1 = ISD2560 + socket
IC2 =LM78L05
IC3 = LM386 + socket
MIC = Condensator microphone
S1,2 = Pushbutton (S1 = Start and Pause. S2 = Stop and Reset)
S3 = Change-over [...]

A amplifier of acoustic frequencies can be manufactured with discernible materials, despite is known so much the difficulties of finding of materials, what the problem of regulations. These difficulties are overcome relatively easily if we find amplifier in form completed.
Completed STK465 is an amplifier of acoustic frequencies that offers qualitative output, using minimal [...]

It’s a very high Quality very simple unit and there is no need for a preamplifier.
Circuit Diagram:

Amplifier parts:
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 Cermet (optional)
C1 = [...]

Circuit Diagram:

Two low voltage, low power zeners are used to control electronically the level of an audio signal. The attenuation range is from 6 to 58dB for an input current from 0.042 to 77 mA corresponding to a control voltage from 2.7 to 7.5V. If control voltage is limited to 5V, the attenuation is around [...]

This project is a 3 or more lines mixer. For more than 3 inputs you can repeat the input parts (P=10K R=22K). It powered with 9Vdc
Circuit diagram

Components Layout

PCB (5,5cm x 4,4cm)

This amplifier is designed for self-powered 8, 4 & 2 Ohm loudspeakers with Bass-boost switch
Circuit diagram:

Parts:
P1 = 10K Log.Potentiometer
R1,R2 = 33K 1/4W Resistors
R3 = 33R 1/4W Resistor
R4 = 15K 1/4W Resistor
R5,R6 = 1K 1/4W Resistors
R7 = 680R 1/4W Resistor
R8 = 120R 1/2W Resistor
R9 = 100R 1/2W Trimmer Cermet
C1,C2 = 10?F 63V Electrolytic Capacitors
C3 = 100?F 25V Electrolytic Capacitor
C4,C7 = 470?F 25V Electrolytic Capacitors
C5 = 47pF 63V Ceramic [...]

Designing of 25W Mosfet audio amplifier with High Quality simple unit and No need for a preamplifie.
Circuit diagram

Parts: R1,R4 = 47K 1/4W Resistors
R2 = 4K7 1/4W Resistors
R3 = 1K5 [...]

A giant spider has been discovered in the dunes of the Sands Of Samar in the Southern Arava region in Israel by the tem of biologist in the University of Haifa- Oranim. The scientific name of this creature is Cerbalus aravensis. The spider found is an nocturnal animal. Its foot is nearly two foot [...]

After human beings have started swimming, they have been trying various techniques to breathe like fish. Till now they do this by taking the lightweight oxygen cylinders with them but that has the limitation. The oxygen cylinders can be used for the limited time period only. Then, Alan Izhar-Bodner, an Israeli inventor, has developed a [...]