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I see, now it should be correct. You need 3x - 470Ω instead of 1x
Make a Cloud Chamber Using Peltier Coolers
BC-547(small signal transistor) can't handle the power that the motor draws, you should use BD139 or other similiar transistor in that package.The 100nF capacitor will lower the frequency of the oscillation and you will no longer have high frequency PWM, it may also narrow the range of RPM.
It should work.
I actually used these UV LEDs but as I said in the instructable, they don't have as wide beam angle as the ones I recommended, so if I were to build this again I would probably use the flat top ones, although they are twice as expensive.
I don't see a problem in using a 12-24V wall adapter and then boosting it with this boost converter. I think that it is worth the 2 dollars.
Yes, I meant composite video, but I don't think that RGB is necessary just black and white composite video, there should be even a library for that.
Although the UV light on the picture is not as uniform, I am able to expose the board evenly without moving the panels. The exposure takes 1 minute and 30 seconds.
actually the resistors drop very little voltage, remeber that if there is 10 LEDs in series and suppose that each LED has a voltage drop of 3V then there would be 30V dropped across the LEDs.
Using the Sparkfun Motor Driver 1A Dual TB6612FNG - a Beginner's Guide
Modular UV LED Exposure UnitView Instructable »
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What about composite 4-in-1 ? Would that be possible also?
What about composite 4-in-1 ? Would that be also possible?
Arduino VGA Games 4-in-1
I have found the answer. When the counter stops at Q1(Q1 is HIGH) and there is only one output HIGH at a time then Q5 must be LOW. 0 volts on the base of PNP transistor(T4) will turn it on so LED2 and LED6 will be lit.
actually I am not sure about this one. Though it has never happend to me that it didn't show any number.
if you were to use smaller potentiometers then you would also have to use smaller resistors R3,R4,R5,R6 in order to preserve sound characteristic. For example if you used a 50k pot that is 10 times smaller than 500k then you would have to use 10 times smaller R3,R4,R5,R6.
Well the technique I use is to: Follow the schematic(if it is well drawn) and design the pcb so it resembles the schematic as much as possible. But just by doing this does not guarantee that the layout will be small so after I have a working but big layout I try to minimalize it. I used to do my prototypes without software but sometimes I forgot to draw a connection somewhere and find the mistake might take hours so now I use Eagle to draw the schematic and PCB because that way I have a certainty that I hadn't forgotten any connection.And my rules for laying a proper layout are:leave enough spacetry to layout the parts and traces in the most logical/symmetrical way keep the traces short and if you plan to etch your PCB then make them as fat as possible that way they won't get etched awa...
Well the technique I use is to: Follow the schematic(if it is well drawn) and design the pcb so it resembles the schematic as much as possible. But just by doing this does not guarantee that the layout will be small so after I have a working but big layout I try to minimalize it. I used to do my prototypes without software but sometimes I forgot to draw a connection somewhere and find the mistake might take hours so now I use Eagle to draw the schematic and PCB because that way I have a certainty that I hadn't forgotten any connection.And my rules for laying a proper layout are:leave enough spacetry to layout the parts and traces in the most logical/symmetrical way keep the traces short and if you plan to etch your PCB then make them as fat as possible that way they won't get etched away etc.
Single line LED display Games
I encurage you to do so. When I was at your age and even now I still look for ideas for projects on the internet.
There is a free version but the PCB size is limited(100x80mm). I think it's called the express version.
No, I did not. As I said I was given this schematic at the school electronics competition and my task was to design a PCB. This circuit sold as a kit (Velleman MK135) and I think that is the original schematic and they have just redrawn it into eagle.I'm 17 years old.
Electronic Decision Maker -...View Instructable »
Well, I haven't tested the "randomness" in much depth, just did a few rolls to see if all six states are working but seemed random enough for me.
Portable Led Game System
Conclusion & Going Further
Electronic dice with slowdo...View Instructable »
With this instructable none, why?
I'm glad that you took my statement as a challenge. One thing I was not aware of with the SMD design is that the most space is saved by the height.Don't forget to show use your version, I'm very curious!
As I don't have a powersupply capable of outputting 0.5V I can't really tell you but 0.5V is below the required 0.7V by the PN junction so I suppose it won't work?I'm not sure but I think that the regular joule thief can work with 0.5V without any special transistors.But if you want to know you should really try it out and let us know.
Transformerless Adjustable ...View Instructable »
Itty bitty Joule Thief
SMD 555 Timer Piano!
oh I'm sorry, that's just the way it looks in eagle.
Yes, that is what 7809 is supposed to do.
Click on the image then right click and select show picture. Then you should be also able to zoom.Or did you mean something else ?
Thank you so much, I didn't know that my dc jack has that switching feature! Neverthless it would not help me because then the batteries would be connected to voltage regulator(linear) and I don't want to waste any of their power. So I connected them through diode to the output of the regulator.
Click on the image then right click and select show picture. Then you should be also able to zoom.
Thank you so much, I didn't know my dc jack had that feature! I could have done it the same way as you.
Simple Stereo Amplifier - L...View Instructable »
I added the video finally.
Joule Thief With Ultra Simple Control of Light Output
Yes it can but there must be current flowing so if you are looking for a cable that goes to light bulb you have to turn it on first.
Yes you are right, now there are 4 diodes in the schematic
the letters A,B,C indicate the range of beta of the transistor, but any should work for you.
Electromagnetic Field (EMF)...View Instructable »
Simplest High Frequency PWM...View Instructable »
It sounds exactly like in the video in first step.
It sounds exactly the same as in the video in the first step.
why would you need an arduino if you can do it with 2 chips at a cost of few cents ?
Knight Rider LED Flasher - ...View Instructable »
Auduino - Lo-Fi Arduino Syn...View Instructable »