Wednesday, June 12, 2013
Air Flow Detector circuit Schematic with explanation
This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus lowering its resistance. A comparator is used to detect this difference and light an LED. With a few changes, the circuit can be connected to a meter or ADC to provide an estimation on the amount of air flow. 
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Parts
| |
Notes |
- The glass will have to be removed from L1 without breaking the filament. Wrap the glass in masking tape and it in a vise. Slowly crank down until the glass breaks, then remove the bulb and carefully peel back the tape. If the filament has broken, you will need another lamp.
58 of Americans survey online before shoppping online
Pew Internet and American Life Project has just released the latest the survey results of online shopping habits of Americans . One of it: 58% of Americans said that they have investigated before buying anything online, and this proportion is only 49% in 2004. In these respondents, who call themselves Internet users rose to 78%.
In addition, to investigate not only the proportion of shopping before the increase, and the network of people has also increased the frequency of the investigation.
21% of adults engage in every day of this survey, one in 2004 compared to only 9%.
American research, reviews, online shopping more and more
In addition to the website to read the description of products and services in addition, many people also add a Review of information, analysis, views of the product, especially through social networking sites. 24% of Americans said they would comment after buying things.
The Pew study also online shopping of American spending habits have been studied. There have been online shopping experience of Americans in May 2000 from 36% to 52% now. Meanwhile, online booking air tickets and hotels from 22% to 52%.
The study also found that study habits between men and women of similar, but high-income groups than low-income populations of the network to investigate more. High income and highly educated people post reviews and comments more frequently.
Many Americans are shopping online before comparing the price, quality and product review. Even if the end did not buy the site, but in the store shopping, they will advance the investigation and decision-making on the Internet.
More...
In addition, to investigate not only the proportion of shopping before the increase, and the network of people has also increased the frequency of the investigation.
21% of adults engage in every day of this survey, one in 2004 compared to only 9%.
American research, reviews, online shopping more and more
In addition to the website to read the description of products and services in addition, many people also add a Review of information, analysis, views of the product, especially through social networking sites. 24% of Americans said they would comment after buying things.
The Pew study also online shopping of American spending habits have been studied. There have been online shopping experience of Americans in May 2000 from 36% to 52% now. Meanwhile, online booking air tickets and hotels from 22% to 52%.
The study also found that study habits between men and women of similar, but high-income groups than low-income populations of the network to investigate more. High income and highly educated people post reviews and comments more frequently.
Many Americans are shopping online before comparing the price, quality and product review. Even if the end did not buy the site, but in the store shopping, they will advance the investigation and decision-making on the Internet.
Mini Guitar Bass Amplifier circuit and explanation
Output power: 6W into 4 Ohm load, FET input stage - Passive Tone Control
Tiny, portable Guitar Amplifiers are useful for practice on the go and in bedroom/living room environment. Usually, they can be battery powered and feature a headphone output. This project is formed by an FET input circuitry, featuring a High/Low sensitivity switch, followed by a passive Tone Control circuit suitable to Guitar or Bass. After the Volume control, a 6W IC power amplifier follows, powered by a 12-14V dc external supply Adaptor or from batteries, and driving a 4 Ohm 10 or 13cm (4"/5") diameter car loudspeaker. Private listening by means of headphones is also possible.
Circuit diagram:
P1______________1M Linear Potentiometer
P2____________100K Log Potentiometer
R1_____________68K 1/4W Resistor
R2____________470K 1/4W Resistor
R3______________2K7 1/4W Resistor
R4______________8K2 1/4W Resistor
R5____________680R 1/4W Resistor
R6____________220K 1/4W Resistor
R7_____________39R 1/4W Resistor
R8______________2R2 1/4W Resistor
R9____________220R 1/4W Resistor
R10_____________1R 1/4W Resistor
R11___________100R 1/2W Resistor
R12_____________1K5 1/4W Resistor
C1____________100pF 63V Polystyrene or Ceramic Capacitor
C2,C5,C9,C14__100nF 63V Polyester Capacitors
C3____________100µF 25V Electrolytic Capacitor
C4_____________47µF 25V Electrolytic Capacitor
C6______________4n7 63V Polyester Capacitor
C7____________470pF 63V Polystyrene or Ceramic Capacitor
C8______________2µ2 25V Electrolytic Capacitor
C10___________470µF 25V Electrolytic Capacitor
C11____________22nF 63V Polyester Capacitor
C12__________2200µF 25V Electrolytic Capacitor
C13__________1000µF 25V Electrolytic Capacitor
D1______________3mm red LED
Q1____________BF245 or 2N3819 General-purpose N-Channel FET
IC1_________TDA2003 10W Car Radio Audio Amplifier IC
SW1,SW2________SPST toggle or slide Switches
J1____________6.3mm Mono Jack socket
J2____________6.3mm Stereo Jack socket (switched)
J3_____________Mini DC Power Socket
SPKR__________4 Ohm Car Loudspeaker 100 or 130mm diameter
Notes:
Output power (1KHz sinewave):
6W RMS into 4 Ohm at 14.4V supply
Sensitivity:
50mV RMS input for full output
Frequency response:
25Hz to 20kHz -3dB with the cursor of P1 in center position
Total harmonic distortion:
0.05 - 4.5W RMS: 0.15% 6W RMS: 10%
Tone Control Frequency Response:
Tiny, portable Guitar Amplifiers are useful for practice on the go and in bedroom/living room environment. Usually, they can be battery powered and feature a headphone output. This project is formed by an FET input circuitry, featuring a High/Low sensitivity switch, followed by a passive Tone Control circuit suitable to Guitar or Bass. After the Volume control, a 6W IC power amplifier follows, powered by a 12-14V dc external supply Adaptor or from batteries, and driving a 4 Ohm 10 or 13cm (4"/5") diameter car loudspeaker. Private listening by means of headphones is also possible.
Circuit diagram:
Mini Guitar-Bass Amplifier Circuit Diagram
Parts:P1______________1M Linear Potentiometer
P2____________100K Log Potentiometer
R1_____________68K 1/4W Resistor
R2____________470K 1/4W Resistor
R3______________2K7 1/4W Resistor
R4______________8K2 1/4W Resistor
R5____________680R 1/4W Resistor
R6____________220K 1/4W Resistor
R7_____________39R 1/4W Resistor
R8______________2R2 1/4W Resistor
R9____________220R 1/4W Resistor
R10_____________1R 1/4W Resistor
R11___________100R 1/2W Resistor
R12_____________1K5 1/4W Resistor
C1____________100pF 63V Polystyrene or Ceramic Capacitor
C2,C5,C9,C14__100nF 63V Polyester Capacitors
C3____________100µF 25V Electrolytic Capacitor
C4_____________47µF 25V Electrolytic Capacitor
C6______________4n7 63V Polyester Capacitor
C7____________470pF 63V Polystyrene or Ceramic Capacitor
C8______________2µ2 25V Electrolytic Capacitor
C10___________470µF 25V Electrolytic Capacitor
C11____________22nF 63V Polyester Capacitor
C12__________2200µF 25V Electrolytic Capacitor
C13__________1000µF 25V Electrolytic Capacitor
D1______________3mm red LED
Q1____________BF245 or 2N3819 General-purpose N-Channel FET
IC1_________TDA2003 10W Car Radio Audio Amplifier IC
SW1,SW2________SPST toggle or slide Switches
J1____________6.3mm Mono Jack socket
J2____________6.3mm Stereo Jack socket (switched)
J3_____________Mini DC Power Socket
SPKR__________4 Ohm Car Loudspeaker 100 or 130mm diameter
Notes:
- Connect the output Plug of a 12 - 14V dc 500mA Power Supply Adaptor to J3
- Please note that if the voltage supply will exceed 18V dc the IC will shut down automatically
Output power (1KHz sinewave):
6W RMS into 4 Ohm at 14.4V supply
Sensitivity:
50mV RMS input for full output
Frequency response:
25Hz to 20kHz -3dB with the cursor of P1 in center position
Total harmonic distortion:
0.05 - 4.5W RMS: 0.15% 6W RMS: 10%
Tone Control Frequency Response:
Electronic Privacy Screen Of Dell Protect Privacy In Public Places
October 2008, Dells provides a new security technologies which is Electronic Privacy Screen for its next-generation Latitude business notebook flagship model E6400. However, there are still few user who understand the function so far. Here I am explain it again today.
Over the past few years, display manufacturers have been increasingly viewing angle will be as a promotional selling point. If you use at home, of course, the higher the better viewing angle, but in the workplace, coffee shop, airport or other public places, privacy and data security issues become more exposed. Members may have noticed that some of my colleagues has focused laptop privacy screen labeled anti-spy film.
Currently, only Dell Latitude E6400 can support electronic security shield technology, Dells official website users can be customized when ordering. This notebook is equipped with software-driven display screen can create a pixel-based pattern, so it can narrow the viewing angle the screen to avoid being shown the privacy of important data or content is sweeping others. This feature is activated, the user only in the notebook before had just being able to clearly see the displayed content, and in the side, the content is completely unable to see.
Electronic Privacy Screen almost have nothing to do with the display brightness, it can be activated just by the shortcut key combination (FN + E) or the Dell ControlPoint software. The consumers who focus on data security and privacy of may try it.
More...
Over the past few years, display manufacturers have been increasingly viewing angle will be as a promotional selling point. If you use at home, of course, the higher the better viewing angle, but in the workplace, coffee shop, airport or other public places, privacy and data security issues become more exposed. Members may have noticed that some of my colleagues has focused laptop privacy screen labeled anti-spy film.
Currently, only Dell Latitude E6400 can support electronic security shield technology, Dells official website users can be customized when ordering. This notebook is equipped with software-driven display screen can create a pixel-based pattern, so it can narrow the viewing angle the screen to avoid being shown the privacy of important data or content is sweeping others. This feature is activated, the user only in the notebook before had just being able to clearly see the displayed content, and in the side, the content is completely unable to see.
Electronic Privacy Screen almost have nothing to do with the display brightness, it can be activated just by the shortcut key combination (FN + E) or the Dell ControlPoint software. The consumers who focus on data security and privacy of may try it.
Wednesday, June 5, 2013
Chevrolet Corvette Electrical Wiring Diagramcircuit Schematic
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