Have you ever thought of picturing yourself being a spy? Doing covert operations and spying on people? Nah, I think you've only seen them on movies, yes on movies, but how about giving it a try, though not professionally.
So I’ve decided to give it a try. One cool thing that most spies used is a spy microphone. I found this cool spy microphone that uses laser. How cool is that, a spy microphone and a laser is too awesome right?
Though I found about this tutorial as not the most practical recording setup we can every used, but it still in an interesting bit of science and a great DIY Project.
What’s so cool about this thing is that it will allow you to listen inside of buildings hundreds of feet away from you (yes, I know what you’re thinking, lasers are awesome). The process of creating the device involves a simple bit of soldering and all we will need is a laser pointer, tripod and old pair of headphones, photocell and a recording device.
Here’s a simple diagram of the device. Sorry, just grabbed it from the source.
The output forms a complex signal when an electric current passes through the said diaphragm, which can then be interpreted by a recording device as sound. It can record sound though windows with a laser pointer and cheap parts you can find at any electronics store.
It’s really annoying at times when you’re in the middle of a business meeting then suddenly your cell phone rang at full volume because you forgot to put it on a silence mode. It’s really an awkward moment when someone is in the middle of giving a report and the phone rang and stopped the speaker from talking.
So I found this easy DYI cell phone jammer that we can put in the conference room or meeting place. It uses the 555 timer [8 pin] IC coupled via C4 [electrolytic] to modulate the MRF transistor oscillator.
Alternatively, we can replace the 555 chip with an electrets microphone. It will also be good to build the unit into a metal box, add an on/off switch (useful when the conference room is not in use for meetings but on other purpose) in the batteries + line, and also put a LED in there. Then connect an old 800 MHz cell phone antenna to C5.
This device’s “Cell Kill Distance” is around 10 – 15 feet, ample for most purposes, so it’s really a good room type cell phone jammer.
So my latest project involves the use of PIC12, PIC16 and PIC18 family microcontrollers, but was not really sure how to use them without a new MCU. So I was looking for solutions on the internet on how to do that and found this tutorial of DIY JDM Programmer.
The first DIY JDM programmer tutorial uses a RS232 DB9 port to program the code into the microcontroller. I will be a bad idea to use a laptop if you’re using a DB9 port since most laptop nowadays don’t have the port, instead the tutorial recommends to use a desktop computer which comes with an inbuilt DB9 serial port.
I was planning to create a PWD DC motor control using a variable resistor or variable resistor connected to a transistor. The problem with this setup is that it generates heat and hence wastes power. So I research for some good PWD modulation DC motor control to eliminate these problems. The PWM controls the motor speed by driving the motor with short pulses. The pulses created vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.
I will try to find if this two projects can be customize or the specifications can be joined together to create a better PWM DC Motor Controller. I will post updates about my progress here.
For the longest time, I’ve been planning to build an Audio Amplifier for my room. I love listening to music, everybody does right? So I’ve done some research on what’s the best amplifier for my room. Then I found this high power audio amplifier that gives a 300 watts output. But man, this kind of output is huge so instead of using this for my room, I’ve decided to use it the whole house audio system. My family loves karaoke and loves to watch movie together, so this is perfect for that.
This 300 watts audio amplifier has a good circuit design in my opinion. According to the tutorial, the circuit has been designed to produce an audio amplifier that can be used for low efficiency speakers or outdoor sound systems since it can deliver 300W of power, so you can use cheap speakers and still create some good quality sounds.
We’ve seen this 300 W power amplifiers and are widely used in commercial installations, video conferences systems, houses of worship (so we can frequently see one of these on churches), hotels or motels, for driving small & medium-sized live PA systems, for bars, clubs, & restaurants, for live sound venues, and for industrial & retail stores. They are mostly preferred since they deliver reliable power, low distortion, and clean output in any occasion and in any time of events.
Misplacing your cell phone can sometimes be annoying. This is a common problem among people who are busy and people who suffers short term memory loss.
I’m a quite a busy person and sometimes forget where I have place my cell phone whether at the house or at the office. So I look for solutions to the problem. The solution, a cell phone detector! How cool is that!
First was to create the PCB found on the pdf provided. The detector uses LM358 that amplifies the received signal from the cell phone. It contains two separate op-amps that are supplied by a common power source. R3 and R7 resistors determine the gain of the amplifiers. When the resistor values are greater than 10M then the noise level increases. If they are small like about 100k, this time it becomes harder to hear the signal.
So there you go, a nice cell phone detector if your too annoyed looking for your misplaced cell phone.
IEC is the shortened form for International Electrotechnical Commission which alludes to a set of universal principles that have been produced by worldwide IEC parts for the Electrotechnology zone all in all. Electrotechnology territory incorporates various electrical innovations, for example, workstations, force sheets, office supplies, home apparatuses, force lines, medicinal gear, telecommunications and even nanotechnology, and also, a lot of people more.
IEC works as a non-benefit universal association to make and distribute guidelines to guarantee Electrotechnology stakeholders, produce segments, frameworks and gear to set principles for ensured arrangement. Besides, every Electrotechnology territory will have a particular IEC alphanumeric standard doled out. For example, the principle power association utilized on the back board of workstations will be made as stated by IEC 60320 benchmarks.
The IEC 60320 principles blankets the connectors known as bays and couplers, found on desktop workstations, force board, force strips, rack-mounted appropriation power supply, power lines and uninterruptible power supply (UPS) gadgets that we'll be talking about here.
Producers like building their items as stated by IEC principles since it empowers the same item is assembled to a more extensive client base i.e. that means just an alternate force line is needed for the item for the fluctuating client base areas. Consequently, items could be fabricated the same lessening assembling expenses and moving logistic concerns when shipping items universally.
IEC connectors are a need inside data engineering and interchanges (ICT) systems when arranging a system foundation to guarantee interconnection is rightly accomplished between gear. Good IEC force strings must be actualized into the system setup. ICT staff must be mindful of distinguishing the unobtrusive contrasts between the couplers and bays on links. Case in point, the IEC 60320-1 Appliance Couplers measures for IEC C13 coupler are really the female connector on an IEC force string, and are utilized to join with the IEC C14 delta male association formed into the back board of a desktop workstation. The formed C14 channel male connector just matches a force string with a C13 coupler to safely interface. In addition, contingent upon your nation area, the force rope for the desktop will have a suitable fitting to fit the nearby mains power outlet toward one side while the flip side will have the IEC C13 coupler to connect to the PC. Note: IEC 60320-2-2 Interconnection Couplers models sheets orientations are really inverse IEC 60320-1 Appliance Couplers guidelines.
Norms indicate IEC C13 and C14 connectors are evaluated with the accompanying determinations eg. Focus pin greatest temperature is 70 degrees Celsius, 10 Amps most extreme present and 250 volts most extreme voltage. However the C19/c20 greatest current rating is 16 amps and focus pin most extreme temperature is 70 degrees Celsius. What's more, both the C13/c14 and C19/c20 connectors are constructed with an earth pin.
The IEC 60320 couplers and bays are accessible in various shapes for diverse electrical machines, for example, for an UPS. A little UPS may have a C14 male channel; however bigger UPS gadgets will frequently accompany an IEC C20 delta male connector for higher current rating. The C20 male delta is interconnected with a C19 coupler female connector. Both the C19 and C20 connectors are distinctive molded to keep away from perplexity with different couplers specified prior.
IEC force sheets are frequently interconnected with desktop workstations when you need the fringe gadgets to be fueled all over close by the workstation. Typically this setup permits assistant force from the machine supply to naturally power here and there the peripherals. The clear profits when interfacing the machine and UPS is you give fall flat wellbeing for the gadgets. Preferably you ought to introduce an IEC force board with IEC force links when joining an UPS and PC.
IEC force sheets are sold in diverse design and synthesis designs, for example, with general 10 Amps outlets, 15 amps, C14 gulfs and C20 deltas. Indeed a couple of affiliates can offer custom force board arrangement designs i.e. to suit situations when ICT staff obliges a particular measure of outlets for cramped setup situations.
The IEC association works with other universal measures associations to create norms you may have seen some time recently, for instance, Iso/iec 38500:2008 Corporate legislation of data innovation is a distinguished standard for the ICT part.
All in all the profits to producers and ICT parts will guarantee items made to IEC principles will be accessible uncertainly. General new item costs will be down, and in addition ICT staff can deal with their Electrotechnology much less demanding with IEC force strings and force sheets since Pcs associated with an UPS guarantee gear is secured. Besides ICT staff and workstation clients can at exactly that point interface committed IEC items with good couplers and deltas.
