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Bed Wetting Alert - Keep the tide out with this effective bed wetting alarm. You just add some circuitry to Jaycar's "Secret Farter" and make a sensor.__ SiliconChip
Bench Supply - PIC Project This unit delivers 0 to 20 volts at up to 4 amps in 0.1volt increments. The entire device runs on a PIC16F870 (about $3 in small quantities) . This is basically a switching power supply with the voltage regulation done in software. The PIC used here has analog inputs (used to measure voltage and current) and hardware PWM (pulse width modulation) output used to control the power. __ Designed by Luhan Monat, Mesa, AZ
Better Cheap Video - PIC Project This device uses a PIC16F1825 for improved performance. Many of its internal features make it a dandy device for this application. __ Designed by Luhan Monat, Mesa, AZ
Better, faster, random numbers - PIC Project Many random number generators are software versions of the hardware shift register feedback circuit. Two problems with this approach are that this operation is usually clumsy in software and the results have some noticeable patterns. __ Designed by Luhan Monat, Mesa, AZ
Biasing MMIC Amplifiers e.g. ERA SERIES - AN-60-010 Application Note__ MiniCircuits.com
Bi-Directional Level Translator - You often need to convert a logic signal from one power-supply voltage to another. This conversion is a relatively simple task, unless the signal happens to be bidirectional. Serial buses such as Access. Bus, I2C, and SBI use bidire�Ψt into __ Designed by Jim Haggerman, Hagerman Technology LLC
Big-Digit 12/24 Hour Clock - It's large, it's bright, it's very accurate and can be used in either 12 or 24-hour mode. A PIC processor powers the works.__ SiliconChip
Bipolars provide stable current source - 09/24/98 EDN-Design Ideas NOTE
: multiple circuits, scoll to this one. It's possible to implement a precise current source with a useful output at high frequencies, without using operational amplifiers. The circuit in Figure 1a suffers inaccuracies from both the VBE drop and the finite base current of the transistor. The circuit in Figure 1b overcomes the base-current problem, but has two VBE drops and does not perform well at high frequencies. Design by Bill Morong, Morong's Harness, Dover-Foxcroft, ME
Bob Blick's Propeller Clock - A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs. It is an illusion, but it works nicely. __ Designed by Bob Blick
Body Detector - If someone comes within cooee it will catch 'em!__ SiliconChip
Boost your ZigBEE range - Simple "roll your own" antennas for the XBee__ SiliconChip
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
Bridge Adaptor for Stereo Power Amplifiers - Would you like to connect a stereo amplifier in "bridge mode" in order to deliver double the power to a single loudspeaker system? This simple adaptor allows you to do it, without any modifications being necessary to the power amplifiers themselves.__ SiliconChip
Bridges - AN43 Subtitled "Marrying Gain and Balance, " this note covers signal conditioning circuits for various types of bridges. Included are transducer bridges, AC bridges, Wien bridge oscillators, Schottky bridges, and ors. Special attention is given to amplifier selection criteria. Appended sections cover strain gauge transducers, understanding distortion measurements, and historical perspectives on bridge readout mechanisms and Wein bridge oscillators. __ Linear Technology/Analog Devices
Bright 20W LED Floodlight - Last February, we published a DIY 10W LED Floodlight, which has been enormously popular. We said that one was almost blindingbut to paraphrase Croc Dundee, that's not bright. THIS one is BRIGHT!__ SiliconChip
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 12/24V 3-Stage Solar Charge Controller - Are you building the ultrasonic anti-fouling unit for your boat? You will need a solar panel and a charge controller to keep the batteries topped up. Or are you thinking of a large solar panel for your caravan or 4-wheel drive? Again, you will need a solar charge controller. This is the one to build.__ SiliconChip
Build a 6-Digit Nixie Clock, Pt.1 - We have been wanting to produce this Nixie Clock project for a long time and now it has finally come to fruition. It has the warm, fascinating glow of Nixie tubes with their hypnotic counting action, mixed with a cool blue glow from a high-brightness LED from underneath each tube. It makes an eye-catching display, both during the day and at night.__ SiliconChip
Build a 6-Digit Nixie Clock, Pt.2 - Last month, we gave some of the history of Nixie tubes and described the design of the NX14 clock and its circuit. This month, we give the assembly details and describe the optional blue LED up-lighting which we think that most constructors will definitely want, together with the attractive see-through Perspex case.__ SiliconChip
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