background preloader

Build the BASIC SPY TRANSMITTER - Page 1 of 16

Build the BASIC SPY TRANSMITTER - Page 1 of 16
Build the 2 transistor Spy Transmitter Radio frequency projects can seem more difficult than most electronics projects because most of the time you cannot build them on a solderless breadboard and there may be parts used that are not easy to source such as coils and adjustable capacitors. This project is focused towards those who have not yet attempted to build any kind of RF project, and it is laid out in such a way as to make it easy to explore the basic principles of RF circuitry and ensure a successful final product. This simple 2 transistor audio transmitter will send the sounds picked up in a room to any FM radio tuned to the same frequency as the transmitter, somewhere between 80 and 100 Megahertz. Figure 1 - You can salvage most of the parts needed from an old radio Since many of the parts only need to be "close enough", you will probably be able to salvage all that you need from any old radio, TV, or RF based circuit board. You are Viewing... Related:  Electronic Circuits

Mike's Electric Stuff How To Make A Coil Gun: Turning Electricity Into Velocity « Fear Of Lightning How To Make A Coil Gun: Turning Electricity Into Velocity In this article, I'll show you how to build a coil gun. A coil gun is a device that fires magnetic projectiles at high velocities, using electricity. Coil guns require no explosive propellant, therefor can be fired an infinite amount of time, providing that there is ammunition and available electricity. The Coil Gun: Concept A coil gun typically consists of a coil(s) of copper wire (similar to a solenoid), a capacitor bank, a transformer, a DC power source, a method of releasing the energy in the capacitors through the coil, and a projectile. The Materials You can either make your own coil, or find/buy a solenoid (found online here)A disposable camera, or other DC voltage source over 300 volts. Note: I used a different on/off switch, but any on/off switch works. The Tools Soldering ironHot glue gunWire cuttersExacto knifeScrew drivers (depending on your disposable camera and your soldering iron, you could need Phillips or Flat) Tips

Hobby projects - Simple electronic circuits Computer microphones Learn how to interface electret and dynamic microphones to the standard computer sound card. Metal detectors Theory of operation and schematics of the most common metal detectors used today: Very Low Frequency (VLF), Pulse Induction (PI) and Beat-Frequency Oscillator (BFO). Wireless microphone The wireless microphone transmitter can be built in an afternoon with simple, affordable and widely available parts.

Paranoid DIY: Do's and Don'ts of Faraday Cages, Build Your Own And Protect Your Vital Electronics. | Paranoid News - UFOs, Conspiracies and the end of the world. Get Paranoid! As you may recall, last week we talked about how to make a Faraday wallet which, while very effective to prevent the RFID chips from broadcasting information about you were still very small to put your electronic valuables in there. I tried to stuff my cellphone inside mine and I was barely able to cover half of it! So now as part of the Paranoid DIY series I am going to post an article about Faraday cages and how to make your own to save your computer, your radio, your camera or whatever electronic belonging you may have that you are attached to. In my case, is my coffee maker machine and my computer, cause I live on pr0n and coffee cigarettes, internet and coffee. Hit the break to read more about this. First of all, you need to know the DOs and DON’Ts and the myths about Faraday cages. Now, in the last DIY article, the one about the Faraday wallet I said that “Also, you can wrap whatever you want to shield in tinfoil” . Picture courtesy of Thanks to Isabelle for the tip.

AVR projects and AVR Butterfly gcc port by Martin THOMAS G.d.W. SS2010 FHFFM You may like to visit my ARM-Projects page too (projects and information for NXP LPC2000, Atmel AT91SAM7, STmicro STR7, STM32, LMI LM3S and other controllers with an ARM-core). Last update in the ARM-section: 25. Available Projects and Information (Content) "Last updated" may be just additional information not always a new version of a software-package. AVR Butterfly Application code port to avr-gcc Introduction The AVR Butterfly (ATAVRBFLY) made by ATMEL comes with a preloaded application. For german readers: Der Quellcode der auf dem AVR-Butterfly installierten Applikation wird von ATMEL für den IAR C-Compiler zum Download bereitgestellt. Even if you do not own an AVR Butterfly you may find usefull information in the BF application code for general ATMEL AVR development tasks. From the gcc-port of the application code some methodes how to convert IAR-code to avr-gcc/avr-libc-code can be learned. Butterfly gcc-port history Software 2.Oct.2003 - 4.

GPS - The Complete Guide - Arduino based Global Positioning System GPS:- The Complete Guide to Global Positioning Systems. Updated Here :- Arduino based Global Positioning System How they Work and How to interface them into your Robot. Does your Robot need to fix its absolute Position - Speed - Heading - Time - Date & Altitude. Here is a Guide to explain the Process. GPS satellites (presently totalling 31) orbit the Earth at an approx. altitude of 20,000Km. For a GPS unit to fix its location it needs to receive at least 3 satellites The GPS signal that is transmitted from each satellite contains:- Time. down to the millisecond range (GMT-referenced). From this information it is also possible to work out Compass Heading and Speed . What follows below is an Arduino based system that i can Highly recommend. It is very easy to interface into projects. It is a compact robust system and very reliable. I will be using a GPS Shield using the USGlobalSat EM-406A receiver This Shield has also a data logging facility that saves to an SD card . Then wire the GPS unit so:-

Operational amplifier applications This article illustrates some typical applications of operational amplifiers. A simplified schematic notation is used, and the reader is reminded that many details such as device selection and power supply connections are not shown. Operational amplifiers are optimised for use with negative feedback, and this article discusses only negative-feedback applications. Practical considerations[edit] Op amp parameter requirements[edit] In order for a particular device to be used in an application, it must satisfy certain requirements. have large open-loop signal gain (voltage gain of 200,000 is obtained in early integrated circuit exemplars), andhave input impedance large with respect to values present in the feedback network. With these requirements satisfied, the op amp is considered ideal, and one can use the method of virtual ground to quickly and intuitively grasp the 'behavior' of any of the op amp circuits below. Component specification[edit] Input bias currents and input offset[edit] When

How to Set Up Your Own Remote Home Monitoring System Ever wish you could use your tech to keep an eye on your home while you're gone? Well, you can--and you don’t need an expensive, dedicated setup. All you need is a webcam. In this how-to package, we'll show you how to use your everyday tech to set up a motion-detecting camera in your house, so you can keep an eye out for intruders, mischievous pets, or even roommates with a weakness for the contents of your snack drawer. First, we'll use Yawcam software to employ any standard PC webcam (USB or built-in) as a surveillance camera for free, so you can keep an eye on your home desk for yourself. If you have a laptop, all-in-one desktop PC, or a monitor with a built-in webcam, you won't need to spend any money on this project at all. Next, we'll bolster the coverage of your surveillance setup by adding whatever spare iOS or Android gadgets you have handy--old phones, iPod Touches, anything with a camera--to the mix.

Electronics Demonstrations BasicsA/C CircuitsPassive FiltersOther Passive CircuitsDiodesOp-AmpsMOSFETsTransistors (Bipolar)Combinational LogicSequential Logic555 Timer ChipTransmission LinesMemristorsTunnel DiodesSpark Gaps