Electronic Circuits on Circuit Exchange International (CXI) RF Remote Control --- How to build a simple remote control system --- Note: Ming no longer manufactures the RE-99 receiver & TX-99 transmitter RF components. We will leave this project up for users that may still have the Ming RF components. If you plan to build this project, simply replace the RE-99 receiver & TX-99 transmitter with the RWS-434 & TWS-434A RF receiver & transmitter modules found HERE . Due to the huge interest in this project, I have just recently finished the NEW schematics. This project uses the Ming TX-99 V3.0 300 MHz AM, RF Transmitter module shown below for transmitting data. The photo above shows the Ming TX-99 V3.0 . Here's a quick sample of how to configure a switch to power up the transmitter and enable the transmission: Transmit Switch Configuration Using the pushbutton switch to make/break the ground connection for the power circuit to your transmitter, you save power and only transmit data when you push the switch. Note: Ming now has a new version of the RE-99. Click HERE For
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.
How to Automate Your House With Your iPhone The iPhone’s ability to connect to wireless systems via Wifi and/or Bluetooth opens up a wide range of potential devices that the iPhone can control. This functionality isn’t limited to your television or stereo but expands over a variety of electronic equipment in your home. Today we’ll take a brief look at ten iPhone applications that are built to control elements of a home automation system. Examples include everything from video cameras and security systems to lighting rigs and automatic blinds. What will you control? Read Before You Buy The big disclaimer that you should be aware of before buying any of these apps is that almost all of them require extra hardware of some sort. Needless to say, many of these apps are targeted at serious technology geeks already familiar with home automation technology. HomeWorks Light Control Required Hardware: A Lutron HomeWorks System (more info…) CozyHome “With CozyHome you will be able to control and monitor your home automation systems. House Control
101 - 200 Transistor Circuits e-book. It contains a further 100 circuits, with many of them containing one or more Integrated Circuits (ICs). It's amazing what you can do with transistors but when Integrated Circuits came along, the whole field of electronics exploded. IC's can handle both analogue as well as digital signals but before their arrival, nearly all circuits were analogue or very simple "digital" switching circuits. Let's explain what we mean. The word analogue is a waveform or signal that is changing (increasing and decreasing) at a constant or non constant rate. But let's crawl before we walk and come to understand how to interface some of these chips to external components. Colin Mitchell TALKING ELECTRONICS. To save space we have not provided lengthy explanations of how the circuits work. KIT OF PARTS Talking Electronics supplies a kit of parts that can be used to build the majority of the circuits in this book. MORE INTRO There are two ways to learn electronics.
Low-power communication device Short-range devices are low-power transmitters typically limited to 25–100 mW effective radiated power (ERP) or less, depending on the frequency band, which limits their useful range to few hundred meters, and do not require a license from its user. Applications for short-range wireless devices include power meters and other remote instrumentation, RFID applications, radio-controlled models, fire, security and social alarms, vehicle radars, wireless microphones and earphones, traffic signs and signals (including control signals), remote garage door openers and car keys, barcode readers, motion detection, and many others. The European Commission mandates through CEPT and ETSI the allocation of several device bands for these purposes, restricts the parameters of their use, and provides guidelines for avoiding radio interference.[1][2][3] Frequency bands[edit] SRD860[edit] See also[edit] References[edit] External links[edit]
Passive filter circuits : Worksheet Question 1: In very simple, qualitative terms, rate the impedance of capacitors and inductors as ßeen" by low-frequency and high-frequency signals alike: Capacitor as it äppears" to a low frequency signal: (high or low) impedance? Capacitor as it äppears" to a high frequency signal: (high or low) impedance? Inductor as it äppears" to a low frequency signal: (high or low) impedance? Inductor as it äppears" to a high frequency signal: (high or low) impedance? Capacitor as it äppears" to a low frequency signal: high impedance. Capacitor as it äppears" to a high frequency signal: low impedance. Inductor as it äppears" to a low frequency signal: low impedance. Inductor as it äppears" to a high frequency signal: high impedance. Challenge question: what does a capacitor äppear" as to a DC signal? Notes: Ask your students how they arrived at their answers for these qualitative assessments. Question 2: Question 3: Hint: this only requires a single component per tweeter! Question 4: Question 5: Question 6:
Web design and tools - Homemanageables Z-Wave Home Automation & Remote Monitoring Starter Kit - HM-SK001 Overview Features At A GlanceTotally wireless - no wires to runFully compatible with any Z-Wave enabled networkPerfect for your home or businessUser-friendly interface is easier to use than an ATMFast and simple setup takes about 30 minutesWith Remote Access, system is controllable from your cell phone, internet connected computer, or land line via a toll-free voice command system How Does It Work? Using the latest wireless technology, each wireless device sends and receives commands from the system, controlled on your computer. Remote Access Service Homemanageables affordable Remote Access Service makes life simple by giving you total control of your home no matter where you are. What's IncludedHomemanageables Software(2) HM-LM001 lighting modules (dimming)(1) HM-AM001 appliance module(1) HM-DW001 door/window sensor(1) HM-US001 USB Z-Wave Interface(1) three foot USB extension cableQuick Start GuideCoupon for FREE 30 day trial of Remote Access Service Back To Top Q: Is it easy to use?
LC meter, Coil Capacitor meter This LC meter circuit can measure coils and capacitors. When Lx or Cx is connected in the circuit the oscillator frequency will decrease and this decrease is measured by a frequency-voltage converter build with T3 and T4. To adjust this lc meter circuit with P1 and P2. LC meter precision is 3%. Scale calibration can be achieved with this formula: ni = nm(1 – fr)/(1 – fc) where ni is number of divisions measured on the scale, nm = total number of division of the scale, fr = relative frequency, fc = the smallest relative frequency measured. The total power consumption is 12mA at 12V when the LC measurement occur. Coil Capacitor meter schematic components