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Get flash to fully experience Pearltrees
Question 1: In very simple, qualitative terms, rate the impedance of capacitors and inductors as ßeen" by low-frequency and high-frequency signals alike: Ask your students how they arrived at their answers for these qualitative assessments. If they found difficulty understanding the relationship of frequency to impedance for reactive components, I suggest you work through the reactance equations qualitatively with them. In other words, evaluate each of the reactance formulae (X L = 2 πf L and X C = [1/(2 πf C)]) in terms of f increasing and decreasing, to understand how each of these components reacts to low- and high-frequency signals.
Passive filter circuits : Worksheet
101 - 200 Transistor Circuits
This is the second half of our T ransistor 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.
LED Testing — DIY How-to from Make: Projects
Here are a few tools to make testing LEDs and other things easier. LEDs are so much fun. LEDs are everywhere and in every project you see anywhere.
One type of signal that is in frequent demand is the sine wave. Of course, we could use an op amp in place of a transistor as the gain element in a Wien Bridge oscillator or a Twin-T oscillator, but they have a problem with requiring multiple capacitors and resistors in some odd configurations for setting the frequency of oscillation. Can we do something with analog integrators and inverters to obtain the same result? The circuit to the right implements the mathematical relationship between the sine and cosine trigonometric functions. Mathematically, if you integrate a sine wave, you get an inverted cosine wave. Basically, it's the same waveform but shifted 90° in phase.
A Sine Wave Generator
This site uses PNG images and CSS. Firefox browser or IE7 or later recommended. May not display properly on IE6 or earlier. Introduction Welcome to Circuit Exchange International.
Electronic Circuits on Circuit Exchange International (CXI)
pwm
Pancyclopaedic Prototyping Polymath | The Amp Hour
Joe still stays in touch with some from the group, including Mudge , who is now a program director for DARPA trying to get funding for quick turn solutions from hackerspaces, called Cyber Fast Track . Aside from hacking days, Joe has debuted and licensed multiple designs to other companies, including: We also talked to Joe about manufacturing and where he does his, prompted by multiple articles about smaller companies moving manufacturing back to the US .
termocouple
If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5 times per second, because the 4017 IC divides the mains 50Hz frequency by 10.
Live-line Detector - circuit diagrams, schematics, electronic projects
Circuit Description: U1a operates as a low-noise microphone preamp. Its gain is only about 3.9 because the high output impedance of the drain of the FET inside the electret microphone causes U1as effective input resistor to be about 12.2K.
Electronic Stethoscope
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.
LC meter, Coil Capacitor meter
Here you will find modifications of many types of HAM radios, microphones, power supplies, modems etc. You can find how to modify a radio to receive and transmit out of range, you can find how to modify a radio to use high speed packet modems, and how to modify the radio/modem to get better performance. Click here for radio mods pages
YO5OFH, Csaba's HAM Radio Home Pages - Мозилин фајерфокс (Mozilla Firefox)
Mike's Electric Stuff
www.electricstuff.co.uk Each of the three main sections has a 'tour' facility for easier navigation through the pages - clicking on the small icons at the corners of each page will move to the next or previous page in that section. Warning! Tesla coils and their ancillary equipment are VERY VERY dangerous and you should not even THINK about trying to make one unless you really understand the dangers of high-voltage electrical systems. And even then you probably shouldn't.The LM122 series are precision timers that offer great versatility with high accuracy. They operate with unregulated supplies from 4.5V to 40V while maintaining constant timing periods from microseconds to hours. Internal logic and regulator circuits complement the basic timing function enabling the LM122 series to operate in many different applications with a minimum of external components.
555 Timer Tutorials
Microelectronics
Parametric Product Search The Parametric Product Catalog (PPC) can be accessed from any page either through the link in this box or through the floating EasyNavi widget. This PPC-Beta version will evolve in the next coming months bringing you easier selection and more added features.Important!!! We are not responsible for any injuries or damage caused by information from this website! Working with electricity is dangerous for your life, especially diagrams related to high voltage! We do not guarantee success in building devices using our diagrams! They are not tested by us. For questions about diagrams use author info below diagram or our contact page.