|
Bipolar Transistor Tester - This tester is primarily meant to test bipolar transistors. it can indicate the type of the transistor as well as identify its base, collector and emitter pins. The circuit is very...__ Electronics Projects for You
Bistable Flip flop - Here are two examples of bistable flip flops which can be toggled between states with a single push button. When the button is pressed, the capacitor connected to the base of the conducting transistor will charge to a slightly higher voltage. When the button is released, the same capacitor will discharge back to the previous voltage causing the transistor to turn off. The rising voltage at the collector of the transistor that is turning off causes the opposite transistor to turn on and the circuit remains in a stable state until the next time the button is pressed and released. __ Designed by
Bill Bowden
BJT Tester - A test circuit for BJT (Bipolar Junction Transistors). This circuit can measure both small signal hfe and DC current gain hFEof a low to medium power power transistor. in addition it can measure collector-base and collector-emitter leakage current. This circuit can also measure hFE at different operating points. A multimeter can be used at multiple test sockets to make all measurements, or two DC ammeters can be used __ Designed by Andy Collison
Blown-Fuse Indicator Sounds an Alarm - 10-Jul-08 EDN Design Ideas: A simple blown-fuse-indicator circuit sounds a buzzer and flashes an LED when a fuse blows Design by Vladimir Oleynik, Moscow, Russia
Body Detector - if someone comes within cooee it will catch 'em! __ SiliconChip
Body Weight Scale Reference Design with Body Composition capability and BLE Connectivity - This reference design is for a complete body weight scale end equipment with body composition capability featuring TI signal chain, power, and connectivity components. With Ti’s AFE4300 weigh scale/body composition AFE, you can accelerate your body weight scale design or quickly add body composition measurement features to your existing platform. This reference design also includes the full BLE connectivity design for easy interface to BLE enabled smartphones, tablets, etc__ Texas Instruments
Boole helps simplify wiring & save Money - 07/08/04 EDN Design Ideas: To safely observe the positions of two cylinders, you need two signalsone circuit, X, which is open only when both cylinders are in a safe position (two normally closed switches in parallel], and one circuit, Y, which is closed onl Design by Jean-Bernard Guiot, Mulhouse, France
Boosting Regulator Current - An outboard pass transistor used to increase the current output of a voltage regulator IC . __ Designed by Andy Collison
Booze Buster Breath Tester - Use this fun device to test your soberity, err sobrity, err how much you have had to drink but dont rely on it to drive.__ SiliconChip
Brain Wave Machine - Humans have been using light and sound to achieve altered states of consciousness for thousands of years. Primitive cultures used flickering fires and rythmic drumming to induce these altered states. Today, you can choose from a wide variety of electronic brain-wave machines which use light and/or sound to alter brain-wave activity. Brain-wave activity ranges from fully awake to deep dreamless sleep. This activity is categorized into five primary groups: Delta, Theta, Alpha, Beta, and Gamma. __ Designed by © Hack Canada
Bridge Reversal Eliminates 1/f Noise & Offset Drift of a Low Noise, Non-Autozeroed, Bipolar Amplifier - This circuit gives 14nV noise level (or 19 effective bits) over a 10mV span. Bridge reversal eliminates 1/f noise and offset drift of a low noise, non-autozeroed, bipolar amplifier. The LTC2440 is a high speed 24-bit No Latency delta sigma ADC with 5ppm iNL and 5μV offset. it uses proprietary delta-sigma architecture enabling __ Linear Technology/Analog Devices App Note, Jul 8th 2010
Bridge-temperature measurement allows software compensation - 08/17/00 EDN Design Ideas: Bridge transducers are notoriously temperature-sensitive. When the temperature changes, almost everything else varies with some parameters increasing and some decreasing. The TCS (temperature coefficient of span) is generally nega Design by John Wynne, Analog Devices Inc, Limerick, Ireland
Broken-Coil Detector Is Simple Circuit Yet Robust - 03/04/10 EDN Design Ideas: The circuit in this Design idea was originally designed to detect damaged conveyor belts in the mining industry. Thin coils are embedded in the conveyor belt. if the belt suffers damage, it stretches at the affected location, causing one or more coils to break. The method for detecting the broken coil is to allow a “sensing” coil to magnetically couple with the passing coils in the belt, thus changing the total inductance of the magnetic pair. The sensing coil is part of an LC oscillator (Figure 1). Design by Juan Pablo Caram, Santiago, Chile
Brownout Voltage Tester - I used this circuit years ago to test AC line powered devices under 95vac line voltage conditions. it has a rating of 250 watts. . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006
Build 3-State Logic Probe - For less than 10 bucks you can build a piece of test gear that you'll find is one of the handiest in your tool kit__ SiliconChip
Build a Digital Audio Millivoltmeter - Versatile unit indicates signal levels in mV, dBv & dbm. Want to measure small signals at audio frequencies? Here's a low-cost digital audio millivoltmeter which will allow you to measure audio signals from below 5Hz to above 100kHz. As well as indicating the level in both millivolts and dBV, it also shows the corresponding dBm level into 600 ohms.__ SiliconChip
Build a Digital Insulation Meter - Think all your double-insulated power tools are safe, just because they are double insulated? As many have found to their ultimate cost, wear and tear on tools can mean that they become decidedly unsafe. Here's a meter that will give you back your peace-of-mind ? on tools and many other electrical and electronic devices.__ SiliconChip
Build a G-Force Meter - Just what are the g forces involved in a balls-to-the-wall lap of Mt Panorama? This little beauty will tell you: instantaneous acceleration, braking, cornering; forwards, backwards, sideways and it's battery operated and completely portable, so you can swap it from car to car! __ SiliconChip
Build a Hearing Loop Level Meter - Setting the correct signal level and minimising noise are critical factors when setting up a hearing loop. This easy-to-build tester can display field strength levels over a 27dB range. Here's how it works, how to build it and how to use it.__ SiliconChip
Build a Hearing Loop Level Meter, Pt.2 - Last month, we described the circuit for the Hearing Loop Tester and gave the assembly details. This month, we show how to build a calibration coil and adjust the tester so that it gives accurate results. We also describe how the unit is used.__ SiliconChip
Build a Hearing Loop Receiver - This receiver is designed to pick up the signal from a hearing loop and will drive a pair of headphones. You can use it with a hearing loop you install in your own home or with commercial loops already installed in halls and churches.__ SiliconChip
Build a Magnetic Field Immunity Tester - You can assemble a precompliance (or even full compliance) magnetic field immunity test system in a few hours using common laboratory instruments, a 100-W audio amplifier, some white PVC Schedule-40 3/4-in. water pipe, some wood, and a copper or aluminum sheet__
Build a Magnetic Stirrer - Want CONSiSTENTLY GREAT home-brew? Build this magnetic stirrer! __ SiliconChip
Build a Temperature Logger - Standalone unit can record up to 2048 measurements and display the results on your PC.__ SiliconChip
Build a USB-based GPIB controller - 112/06/05 EDN Design Ideas: Roll-your-own USB-based instrumentation bus Design by Boštjan Glazar, Marko Jankovec, and Marko Topic, Laboratory of Semiconductor Devices, Ljubljana, Slovenia
Build a Water Level Indicator - Low-cost circuit lights a LED bargraph to indicate the level in a rainwater tank.__ SiliconChip
Build an Analog Bar Graph Expanded Scale Voltmeter - An expanded scale voltmeter (ESV) can save your plane. That may be a strong statement, but it's true. The crucial radio link that lets you control your plane relies on nickel-cadmium (NIC d) batteries in the transmitter and receiver __ Designed by Stefan Vorketter
Build an Inexpensive Hall Effect Gaussmeter - Have you ever wanted to find out how strong a magnet really was, or how the strength of the magnetic field varied as you changed the distance from the magnet or the temperature of the magnet, or how well a shield placed in front of the magnet worked? Voltmeters are fairly inexpensive and easy to find, but where do you purchase a Gaussmeter (also known as a magnetometer). I built a hand-held Gaussmeter for measuring the polarity and strength of a magnetic field. it uses a linear Hall effect device and some op-amps and resistors and things from Radio Shack. __ Designed by Rick Hoadley
Build an LED Bargraph Optical Tachometer - For the electric R/C enthusiast, a tachometer can be a very useful piece of equipment. When I first built this tach back in 1995, it was essential, as there were very few off-the-shelf electric R/C power systems that just worked. At that time, you had to experiment with batteries, speed controls or switches, connectors, and wiring, and a tachometer was a tool to help you measure the results. __ Designed by Stefan Vorketter
Build an Ultrasonic Proximity Detector - Detect objects through ultrasonic sound waves. __ Contact Jameco Electronics
Build this add on Capacitance Meter - This simple add-on capacitance meter has been specially designed to help you identify capacitors from 1p to 10u. There has always been a problem identifying capacitors, due. __ Designed by Collin Mitchell
Build this Negative Ion Detector - Figure 1 shows a schematic diagram of the ion Detector--a rather simple circuit consisting of three transistors (two PN2907 PNP, and a single PN2222 NPN type) , three resistors, one capacitor, an antenna, a mA meter, and an LED __ Designed by Vincent Vollono
Build your own bypass-capacitor tester - 12/06/01 EDN Design Ideas: Most circuits use bypass capacitors and can deliver substandard performance if the capacitors have poor pulse characteristics. Few if any articles cover how to test bypass capacitors for pulse characteristics. The circuit in Figure 1 tests these characteristics. it charges the capacitor under test through 100 kU for approximately 1 msec and then discharges it through 10U for a Design by Carl Pugh, Pugh Magnetics, Newark, CA
Build your own Iso-Tee - Build an iso-Tee from an ordinary T-adapter. __ Designed by Ted Bleiman K9MDM
Build your own laboratory precision voltage reference - 05/24/07 Video Design ideas-EDN Mark Thoren, mixed-signal application engineering manager with Linear Technology, demonstrates an amplifier-based Circuit design for a relatively inexpensive precision voltage source. Design by Mark Thoren, mixed-signal application engineering manager with Linear Technology
Build your own LF/Audio instruments - Devoted entirely to Amateur radio. __ Designed by Jan-Martin Nøding
Build your own Q Meter project - This article appeared in the January/February issue of Amateur Radio (the journal of the Wireless institute of Australia) and is reprinted here for the convenience of others. (Aussies who are not members of the WiA are urged to join our new streamlined national body- it is the only way we have of defending our spectrum allocations against an increasingly greedy mixture of government and private enterprise). __ Designed by VK5JST / VK5TR
Build Youself a Service Monitor? - A simple deviation monitor circuit used with a scanner receiver. __ Designed by Tom Alldread VA7TA
Building a Personal Multimeter (Part-1) - A Digital multimeter is one of the basic equipment used for Test and Measurement in electronics industries. Nowadays portable handheld multimeters are very useful in giving accurate measurement of voltage, currents, ...__ Electronics Projects for You
Button Battery Cell Internal Resistance Measurement Circuit - The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell. However, there is a relationship between battery health and the internal resistance of the cell. This circuit when used. . . Circuit by David A. Johnson P.E.-July, 2006
|
