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Classic top down engineering. Put the people with the smallest understanding of the technical issues in charge of designing the "big picture" and then let those little engineer folks work out their silly problems. This is a consistent problem in corporation based product development. Until...
When you design a board, you might want to have a few exact copies of it. In Eagle, there is a way to make multiple boards, on one sheet of paper or transparent.
This is the way I do what is called Panelizing.
1. Design the board
First things first. While making the schematic, I have...
This project is licensed under a Creative Commons Attribution-ShareAlike license (essentially, it's free to use for any purpose, but any modification must also be shared the same way). See the footer for details.
This Lab PSU is based on the one displayed in the LM317 datasheet, named...
I've always thought that SMD soldering is hard. And I guess it is, when it comes to advanced circuits and SMD ICs.
I had my first try this evening. Both with SMD soldering, and etching with Ferric Chloride.
I've etched a few boards, and I've used Natriumpersulfate, at approximately 50°C. Lot...
I built this circuit while studying 1/2CV^2 = 1/2LI^2
The transistors I had were RCA brand 1B05 and the diode is a 2000 volt fast Trr diode.
Set the current by adjusting Vcc.
I used a single function generator to get a ttl square wave to allow current through the inductor under test, and...
I saw this information on this site and decided to "blog" it so it would be easily available in the future. It is about the turn on time of the diodes and was originally posted about a snubber question.
\begin{array}{l|c|c}
Time & 1N4001-5 &1N4006-7
\hline
.2 usec &.1A&
.3 usec...
This is a question that comes to the board, from time to time. I decided to make a list over some PCB manufacturers.
Usually a post starts with one of these questions:
"Where can I get boards done?"
"Who is best?"
"Which is cheapest?"
"Which is fastest?"
"Who can I trust?"
This is a listing...
Well it looks like I won't be working on this project for a little while. I went out this morning to grab my bike from the rack, and found out it was stolen during the night. The robber cut right through the chain locking it to the rack. I have informed the police and am working on getting them...
This is one simple mini-project that based on the principle of Motor effect.we can clearly visualized the rotating effect when the magnetic flux of magnet is intersect with magnetic flux due to the supply current.
Apparatus required:
1) magnet
2) insulated wire
3) one box
4) power...
Continued...
5) After rigging up the support bar, I set the actual rack on it to see how it looked:
6) And after a bit of welding...
7) Now for the vertical supports. I decided to do what most professional bicycle racks do, and support mine on the rear axle of the bike. I took...
The following photos will show the construction of the rack which holds the motor and the battery.
1) This is the bar that will support the rack and connect to the rear of the seat post:
2) I cut out some pieces from a sheet of scrap metal that could be welded to the bar. The "connectors"...
To begin with, I'd like to mention that I found a relatively small 12 volt car battery out of a Volkswagen Rabbit. It is much narrower than a standard car battery, not to mention about half the weight:
For this reason, I think it will work well to power the bike.
Anyway, back to the...
To begin, we need to have a very basic understanding of what an electronic charge is. Without going too far into physics or chemistry, let's talk briefly about atoms, the smallest building blocks of everything around us.
Atoms: Electrons, Protons, and Neutrons
A molecule of a substance is...
This entry is meant to help you understand powers of 10, scientific notation, engineering notation, and some metric prefixes.
Powers of 10, Scientific Notation vs. Engineering Notation
We have all probably seen something written in math class or in reading any kind of electronics text that...
Remember that solenoid I took off the starter motor way back in post #3? I finally decided on what I'm going to use it for. :D
I figured that the regular brake system would look rather low-tech on a motorized bike. For this reason, I decided to eliminate the handbrake system that came with...
My original plan for controlling the speed of the bike was to use a chip to produce a PWM signal, which in turn would drive a stack of MOSFETS or a relay, and that would control the motor. However, when I was doing some bench-testing of the starter motor I bought at the Volkswagen show, I...
Hi, I wanted to share an easy method to make combinations of nodes to measure voltage across. Very easy and I find it very useful.
Voltage is measured across two nodes, right?, ok, so when you are faced with a circuit that has many nodes like the one below, the question is:
----"How many...
After mulling the requirements and several ideas around in my head, I figured out a way that I could make it work.
The current plan is to build a rack to mount on the back of the bike, to which the motor will be attached. I decided to make the rear wheel pulley-driven, rather than chain-driven...
When I mentioned my idea of eliminating the pedals altogether on the forum, it was mentioned that there may be legal issues with doing that. I decided to look up the laws in my area pertaining to motorbikes. I found none specified for Vermont, the state in which I live, but I did find some...
Ever since I first had the idea to put a motor on my bicycle, I've been trying to decide how to put it together. I didn't know where to mount the motor (front, back, top, side) or how it was going to drive the wheel (chain, direct, etc.). I didn't even know if I was going to drive the front...
