Facebook
Google
GitHub
LinkedinBlogs
This is a tutorial to build a transistorized light detector, it is assumed that a person choosing to build this circuit, has a basic understanding of electronics fundamentals, and are familiar with the basic theorems such as (ohms law, kirchoffs voltage and current laws, ect..) that way the...
1. Using a simple RC filter as resistor and capacitor for 5V and GND of uC surges and interference problems, processing the reference method, the R-value is according to the total current consumption of uC, when modifying the R-value still unable to achieve the desired effect, and then change...
I did this some time in the 1980's. Originally intended as a flashing light controller for advertising, and run on batteries charged from a solar cell. It is supposed to be a night detector that is fairly immune to the headlights of passing cars. The batteries charge in the day time and it...
hi every one,
i want to make the simple circuit for automatic floor announcement in elevator project
complete description is given below
the lift is of 9 floors,when 1st floor comes,the announcement should be like "floor number one" by means of speaker,in my elevator project floor detection is...
A recent comment prompts me to list the basic fan laws here.
For a given change in RPM,
CFM2/CFM1 = RPM2/RPM1
Static pressure 2/ Static Pressure 1 = (Rpm2/ RPM1)^2
Horsepower 2/ Horsepower 1 = (RPM2/RPM1)^3
Reference: Trane Air Conditioning Manual, Page 270, The Trane Company, Fifty-Seventh...
hi,
The circuit is designed for a 12F683 PIC, it outputs QA and QB [ quadrature signals] also two other pins output a 2 Phase non overlapping clock pulses.
The purpose of the project is to be able to drive the QEA and QEB Input pins of say 18F2431/4431, to enable bench testing of Quadrature...
This time I use a small SMPS Transformer, you can also buy a kit for this circuit, including battery holder, a battery, LEDs, a transformer, a proto board, and all required components.
you can find it on my ebay: http://stores.ebay.com/pic-hitechworld
The way of using the 3 transformer...
Clock synchronization to the midday sun
Synchronization to the midday sun is turning out to be an excellent exercise in engineering design.
Here are the three steps:
1) Begin with a concept, theory and initial design.
2) Collect data to support and verify the theory.
3) Test, test and test...
I will put the schematic at the very top and bottom to make it easy to navigate to when reading through the tutorial from top to bottom of the page.
also a short video of this circuit is shown at the bottom link.
from Data books LED is established as 2V @ 30 mA.
Since this is a tutorial...
Originally posted on ETO though I would share with AAC too.
Home Automation controlling the HVAC system
The intention for building this system was to compliment the retrofit of the heating system for my uniquely built home. The home is a three level house built in 1936. It was originally built...
Modern LCD TVs often have built-in media players which make them great candidates for stand-alone media art players, the main problem is how do you make the TV play the media file on power-up? Most require intervention using the remote, going through menus, etc.
To solve this problem I designed...
I just discovered this part recently, they are quite interesting and I can imagine all kinds of neat applications for this device.
The principle of operation is very similar to a piezoelectric beeper, only the operating frequency is an inaudible 25 kHz, the unit has a diaphragm that is excited...
I can't believe that it has been exactly one year since I last posted on my 10000 Year Clock.
Well I finally got the low power LCD and put together a prototype of the clock. So progress is being made.
The LCD is a 40-pin 4-digit module 40LCD from Futurlec.
The LCD driver is MAXIM ICL7211A...
I like these circuits somehow, and build new ones regularily.
Also I have 3 component kits on offer already, a new one coming up soon, with a moderate to high grade of difficulty.
This time, you have to open small old potcore transformer cans, unwind them, and rewind again. The ferrite is also...
...on breadboard!
Also I added another circuit to blink a LED just by exploiting CE breakdown of a transistor.
It does work but needs considerably high voltage.
All together, this LED blink circuit is not very effective, but it's different than these well known multivibrator circuits, and it...
There are accepted standards in this world. This goes directly to the definition of, "convention". A convention is an agreement among people such that, "This will be what we mean when we refer to that". For instance, the conventional flow of electricity is from positive to negative. That...
hi,
Demo for Oshonsoft HID USB with a VB5 PC Terminal
Download and unzip, includes the VB5 source code and other files.
The Demo requires the Visual Basic 5 run time files to be installed in the Windows/System folder.
These run time files are free web downloads.
Unzip the file...
A Luthier friend asked me to make him a simple stereo computer amp. I used the basic circuit from the LM380 datasheet . He was to make a housing out of wood but I couldn't help myself producing this as an interim 'container'.
Sounds great with MP3 and with a preamp was adequate with a...
So I've been learning how to produce chiptunes. You know, the synthesised music from your C64 or NES.
So far I've done two tunes, using two programs. One is famitracker, which emulates specific ICs. In this case, I wrote out Bach's Praeludium Nr. 2, which is emulating a Konami VRC6...
Thanks for the directions VeraCohr. I salute you.
Circuit diagram is clearly visible in picture.
http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&VPW=1670&VPH=751
Components:
3x Bic type pens (sadly)
1x 50v .1uf ceramic
1x 100k 1/2 W
1x 10k 1/2 W
