Hobby Hound - DIY Electronics

Mains Adapter 230V AC 50 Hz to Rectified DC

2010-08-14T11:21:00.000+05:30

Mains Adapter Converts 230V AC 50 Hz to Rectified DC which replaces a Battery Pack. It was also called Battery Eliminator by older generations as it was used to save Battery Cost in AM Radios. From Schoodles The most important product safety aspect is the transformer, may it be well isolated, may it use a split bobbin, may it have a visible insulation between primary and secondary. May the thin primary wires not slip into the secondary .. when not using split core. Use a Layer to...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Torch or Flashlight Circuit Improvements

2010-08-14T10:31:00.000+05:30

I fixed a China Torch with New LEDs and a Diode, it failed probably on a drop shock, the battery wire cut … then when put on charge Few LEDs went bad, as battery was absent in ckt. design review - 1.5uF voltage rating can increase like 440V AC. A current source with low dropout voltage would be great but it builds the cost. The wiring has to be robust. A diode added to keep LED current within some limits on batt overcharge. From Schoodles These type of Torches and Lanterns should not...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Emergency Light with Fluorescent Tubes

2010-08-13T20:32:00.000+05:30

Emergency Light for Portable Use. Note Charger and Battery not Shown. Design from Ludens.cl 12 Volt fluorescent lamp drivers: Three schematics of 12 V drivers for 2, 8 and 20 Watt, plus a lot of explanations about fluorescent tubes. Use the drivers for camping, emergency, boating, etc. From Schoodles Improper Design of Magnetics or Testing at low voltages can damage the switching NPN. The NPN must have fast switching time, see towers for Cob in pF and .fT in MHz. This may Oscillate...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Mains Powered China Emergency Bulb

2010-08-13T18:20:00.000+05:30

A typical Mains Powered China Lamp. On power down, LED light turns on for around 1/2 hr. Gets damaged on lightning activity and wide (uS not nS) transients above 300V. Drawing may have error. From Schoodles

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Two PCB Mills - Jonathan Ward and Ilan Moyer

2010-08-13T16:51:00.000+05:30

Make your own PCB Mechanical Routing/Erosion/Milling Machine at a low cost. PCB Mill - Jonathan Ward - MIT "Design a low cost circuit board milling machine optimized to be mass-produced." Low Cost PCB Mill lan Moyer The overall device has a working area of 4" x 6" with a footprint roughly the size of a letter-sized sheet of paper. Capstan drives were chosen for their simplicity and low cost, and also serve as torque limiters to prevent excessive loads on the small-diameter drive cables.

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Electronic DIY Projects from Dago

2010-08-13T13:32:00.000+05:30

USB-to-1-wire Adapter, ALC-60X Argon Lasers, DDS Function Generator and Gainclone Stereo Amplifier. Electronic DIY Projects from Dago Make a temperature logger for your room on a PC, This uses DS1820 sensors from Maxim and USB for interfacing. USB to 1-wire adapter helps attaching sensors to the computer. This circuit also uses a MAX8881 - 12V, Ultra-Low-IQ, Low-Dropout Linear Regulator. "Getting the board to work in linux (Gentoo) was fairly straightforward. In a nutshell I just have to...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Nomadic Research Labs and Steve Roberts

2010-08-13T12:21:00.000+05:30

The story and evolution from Behemoth to Microship, water-type HPVs. microship.com. Technomadic goodness. Nomadic Research Labs and Steve Roberts Online Store for Technomadics Surplus Kayaking Books Parts Sensors Nautical Controllers GPS Trackers Geek-free Zone marine electronics.

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Powered USB Hub Help PC Interface

2010-07-13T17:44:00.000+05:30

I got a strange problem as i added more and more peripherals, the pc gave odd messages, "i cannot detect what you are doing" and things like that. I almost flipped trying to locate the culprit. The problem was not in any peripheral but in the USB port powering the system itself. The SMPS was not loading much. Certainly the peripherals were drawing more and the warning could have been more like "use your own power". In such situations Twitter shows a whale. I could not locate a powered USB with...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Apple Garage – Mac Ipod Iphone

2010-07-13T12:22:00.000+05:30

Apple Garage - Mac Ipod Iphone " When he was in eighth grade, Steve Jobs, later the co-founder of Apple Computer, telephoned William Hewlett, president of Hewlett-Packard. "Bill answered, and I said, 'Hi, you know, uh, I'm 12 years old and I'm trying to build a frequency counter,' " Jobs recalls. Hewlett, a symbol of entrepreneurial success in the Santa Clara Valley………" The Original Apple Garage Apple Computer, Inc The company introduced the Apple II microcomputer in March 1977. A few...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Bug Labs - Modular Stackable Embedded Computer

2010-07-13T09:39:00.000+05:30

Bug Labs - Modular Stackable Embedded Computer BUGbase is a fully programmable computer, with a CPU, RAM, rechargeable lithium-ion battery, USB, Ethernet, micro-SD and serial interfaces, and a small LCD with button controls. BUGbee is a low-power radio module based on the 802.15.4 protocol, perfect for creating a personal area network (PAN) for machine-to-machine (M2M), home automation and intelligent grid applications. BUGvonHippel is a breakout module to which you can connect sensors,...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Electrician Tool – Continuity Tester

2010-07-13T07:17:00.000+05:30

I had gone to buy some long wires at a electrician shop, when a terminal box had to be tested, he used a continuity tester. When i used to buy electrical parts in the past, they used a tester box, made of wood. This had a bulb and a tubelight starter and two long wires (230v AC). The Continuity tester would light up a 40w lamp. Now he had a LED based one, so i got one for myself. All it had, was two small cells in a plastic box with a LED, i was just flashing the LED as it looked nice thru...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Recording Technology History

2010-07-12T19:20:00.000+05:30

Recording Technology History 1877 - Edison made the first recording of a human voice ("Mary had a little lamb") on the first tinfoil cylinder phonograph Dec. 6 (the word "Halloo" may have been recorded in July on an early paper model derived from his 1876 telegraph repeater) and filed for an American patent Dec. 24. John Kruesi built this first practical machine Dec. 1-6 from a sketch given to him by Edison that was made Nov. 29 (not on "Aug. 12″ that Edison mistakenly wrote on another...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

One Watt Mains LED Lamp or Tubelight

2010-07-12T18:04:00.000+05:30

Lots if Light on One Watt, yes this works, but should be built by those experienced in High Voltage usage and Knowledge of insulation techniques. This has to be encapsulated in a insulated fire retardant plastic enclosure. You can change the values around what is indicated to experiment with types of White LED available. This project is not for Youngsters or those who are still learning. High Voltage can cause injury and can be fatal too, when used or applied without experience, training or...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Charger for Portable Devices like iPod

2010-07-12T16:22:00.000+05:30

This is a simple charger you can build for devices like iPod or iPhone. It works for ipod touch. It can be modified for any device. This may need no modification for devices that are charged using PC USB port. This is a Schematic Doodle called Schoodle. Use it for Learning and understanding. Build and test only when you have practiced and gone beyond simple electrical and electronic circuits. Mistakes can damage your portable device or even waste your components. Hence take care, work...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

PITTs Electronics Home

2010-06-15T13:06:00.000+05:30

PITTs Electronics Home Infos über Elektronik, Applikationen, Schaltungen, Vergleichslisten etc... Hier gibt es alles zum Thema Elektronik, ob allgemeine Informationen, Tips und Tricks, Hilfen, Steckverbinderbelegungen, Tabellen, und jede Menge Schaltpläne, teilweise auch Layouts von Schaltungen und demnächst auch eine riesige Datenbank mit Röhren und Halbleiterdaten. Information about electronics, applications, circuits, comparative lists, etc. .. Here's everything about electronics,...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Tutorial - Controlling The Real World With Computers

2010-06-15T09:46:00.000+05:30

Tutorial - Controlling The Real World With Computers This site is for anyone who is the least bit curious about monitoring and controlling such things as motors, lights and switches, or recording and playing everything from sound to the arm position on a robot. It's for anyone who likes to learn by doing. You will not only read about controlling motors, lights and sound, you will control real motors, real lights, and really record and play information.

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

VeeCAD for Stripboard with Auto Router

2010-06-14T19:14:00.000+05:30

VeeCAD takes a schematic generated netlist and assists you to build a layout - but on stripboard (Veroboard). The usual design tools are provided: netlist import, component footprint definition, component positioning, wiring and connectivity check. VeeCAD for Stripboard with Auto Router Engineers and hobbyists use VeeCAD for prototypes and small quantity builds, saving hours planning layouts on graph paper.

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

BBC Schools Electronics Science Clips

2010-06-11T17:59:00.000+05:30

BBC - Schools - KS2 Bitesize Revision - Science BBC - Schools Science Clips BBC - Schools - DynaMo BBC - Schools changing circuits BBC - Schools - Electricity BBC - Schools - Pod's Mission Systems and control

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Transistorized from - PBS Online - Tutor

2010-06-11T13:37:00.000+05:30

Transistorized from - PBS Online - Tutor Lesson 2: Scientists at Work Students select an electronic invention and research who and what contributed to it. Lesson 4: Using Transistors Students build circuits to see how transistors function as switches or amplifiers Peek at some of Brattain and Schockley's Lab Notes

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Electricity and Magnetism - Molecular Expressions

2010-06-11T08:53:00.000+05:30

These Tutors which are Interactive as well are useful for Students and Enthusiasts to enhance the Text Book reading. Electricity and Magnetism - Molecular Expressions These pages are good for any person who want to be more familiar with magnetism and electricity. This probably means everyone. Today Electricity Basics is General Knowledge and also an Absolute Essential. Interactive Java Tutorials - Covers principles, physics, and devices used in electricity and magnetism.

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

TechLib - Electronic Experimenter Records

2010-06-10T14:57:00.000+05:30

TechLib - Electronic Experimenter Records A technical library for the hobbyist and experimenter. - Charles Wenzel World's Smallest Geiger Counter Karen's Mic. Input Telemetry Device Temperature Controlled Ovens Two-Transistor Atomic Frequency Standard Super-Sensitive Ionization Chamber Cockcroft-Walton Diode Voltage Multipliers Science Fair Ideas This will be a collection of unusual ideas for somewhat difficult science fair projects - hopefully not a repeat of other sources.

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

HobbyMechatronics - DIY Mechanics Robotics

2010-05-16T20:42:00.000+05:30

Mechanics and electronics DIY project. Information for Robotics and Small Machine Automation. HobbyMechatronics - DIY Mechanics Robotics DIY microstepping motor driver Sherline Lathe CNC (mill) conversion XMEGA, the Perfect Robotics Microcontroller?

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Makerbot - 3D Mechanical Prototype Synthesis

2010-05-16T11:51:00.000+05:30

The basic setup you'll need to build a plastic extruding CupCake CNC machine. from Bre Pettis Makerbot is an open source robot that helps people make robots that make things. Makerbot - 3D Mechanical Prototype Synthesis Twitter Interface - @makerbot

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Badog 4 Axis Controller for CNC Cutters

2010-05-16T11:08:00.001+05:30

The 4 axis Badog cnc controller kit is perfect for a 4 axis CNC cutter or a foamcutter. The motors just have to be bolted into position on your project and you have complete control. Badog 4 Axis Controller for CNC Cutters 4 axis kit comes with 4 205 oz/in stepper. Application power options, from 1.5 amps to a full 3 amps your imagination is the limit. From - Badog Switzerland

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.

Audio Consulting Switzerland

2010-05-16T06:57:00.000+05:30

Audio Consulting Switzerland Specialists in very high quality audio, Designs Amplifiers, Preamplifier, Phono Preamplifier and R-evolution Turntable etc. Adapting New Technologies into Classic Hi-Fi systems, without compromising on Decades of Audio tradition. MITA The Mains Independant Tube Amplifier SE battery tube amplifier Features Stereo SE 15w / Channel, Three Silver Rock transformers per channel, Fully Lithium battery powered, All silver internal wiring, Veneer to customer's...

This post is a snippet, to see the full content visit this blog or http://www.dapj.net/. The blogs are listed at dapj Web.