With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
+1 for going through the trouble to update all schematics and for the pictures of the final assembly. I really appreciate it!
Designing a Dual 40A PWM Speed Controller for Brushed Motors
Practical Guide to LEDs 1 - Pick your LED!
Solder Fume Extractor With Activated Carbon Filter
A push-pull driver is essentially a current amplifier made up of two transistors, the output voltage stays the same. The most basic version does not require any additional parts and is therefore a simple, small and cheap solution. It is very well suitable for frequencies up to 100kHz or so. To switch capacitive loads (such as a mosfet gate) I'd suggest a small capacitor (10-100nF X7R) as close to the transistors as possible. Do note that this circuit is generally NOT suitable for amplifying small or precision signals. The output signal is limited by the supply voltage (VCC) to the range of 0.7V - VCC-0.7V, wich may be an issue for some low voltage circuits.
Practical Guide to LEDs 3 - Switching & Dimming
Practical Guide to LEDs 4 - Matrix & Multiplexing
Practical Guide to LEDs 2 - Essential Circuits
@all: Thanks for all your thoughts so far! If you have missed it, check out the parallel thread about the same issue here: http://www.instructables.com/community/User-profile-pages-have-been-changed-for-the-worst/
"Content is being downplayed like it never has been before. Most of a person's profile page is now dedicated to what other people have done. Users' profile pages--what were once pages dedicated to their stuff--are now dominated by others' stuff."This is the major issue. Great content needs a platform to live up to it.
+1 - Yonatan24
Another thing I noticed is that spam comments remain in the user profile, even though they were deleted from the Instructable. Also I noticed that it says that I was a runner up in the Wood Working contest (http://www.instructables.com/contest/woodworking/). I don't think I was. I haven't checked whether everything else is right. I can't figure out what the contest are sorted by it is definitely not date, nor value of the prize. Can we please, please get the old contest patches back? - BrittLiv
Great introduction to LEDs! I look forward to reading your next LED guides!
Home Lab Voltage Reference Module
This is about all there is to it--and I'm not even sure the activity feed would be something for the public.These changes were not needed to be so radical. In making them what they are, things have been worsened. - OrigamiAirEnforcer
Here are my thoughts. There are a lot of them!Positives:-I am a BIG fan of the new activity feed. It's interesting to be able to look back and see when events such as contest wins happened and who is favoriting projects. It's interesting to be able to see which older 'ibles are receiving attention. It makes me want to pay more attention to them myself!-I've always felt Instructables was a little behind on making their site 'mobile friendly', and from a mobile first perspective this new layout works much better!-Setting promoted items is such a great idea. I know the feature doesn't quite work yet, but I'm assuming it's being worked on. This feature makes the page feel more personal and will really let authors display work they are proud of!-I like that it now says what place was won in contests and not just that you won!Negatives:-There is too much 'essential' information that is located below the fold of the page. Personally, I have an external portfolio website listed in my "about" section and I drive a fair amount of traffic to it through Instructables. I wish the placement of this information was somewhere visible when the page initially loads so someone doesn't miss reading it before they click on one of my projects.-I wish I could still see my favorites from this page. I often use my favorites to save Instructables that use resources that I am considering using for my own projects(so, I kinda use it like Pinterest in a way!). It's more steps then necessary to have to go to your 'You Page', click on the correct tab, etc.. This change might drive me to actually use Pinterest! I also wish I could see projects that others have favorited. -I miss being able to see how my followers I, along with others have. Also, you can't sort by 'most views' when viewing all Instructables. When I subscribe to someone new, the decision is usually made after seeing one project I like, noticing they have a good amount of followers, clicking on their page and sorting their Instructables by views which brings of up projects I've usually seen and liked in the past.-The new trophy icons for contest wins seems really impersonal. Getting new patches for my profile has always been an accomplishment. Getting the 'same old' trophy icon is not. It's also hard when looking at the profiles of others to quickly asses what type of contests they enter without the images like the patches have. Also, a lot of the the wrong places were listed(Ex. One of my patches said I won 2nd Place when I was actually a Runner Up). - allie.fauer
The two things like about the new layout are the ability to pick promoted items and I do like the activity feed, but I feel that we all would have been better served if these features we just incorporated into the old layout. - Cherzer
This update surprised me as well. I also can't set "Set promoted items" to work, either in Firefox or Chrome. I click the button and it just brings up a pop-up window with the same 5 Instructables that are already there - none of my other ones are available to swap in. Hopefully that's just a bug that will be fixed soon.Also not crazy about the news-feed ish feature (I've seen complaints in other threads about how it's pretty cluttered by things like people favoriting individual projects, as opposed to activity by the author); or how if you go to "All Instructables", all the sort options are gone. Maybe they did this as a way to help less-popular projects get a leg up, since if people are sorting by views and popularity all the time, that creates a feedback loop where the less popular ones never get any exposure? - Ben Finio
At first I had written:With a 1k pullup I'd suggest using 220Ω series resistors (~19.7V gate drive), maybe 330Ω (~18.0V gate drive) for a slighly larger safety margin. In general you want to set the gate voltage as high as possible to ensure the lowest R_DS,on resistance as possible.But then I realized that the 2.2k resistor will cause the mosfet to turn on slower than off, which may be more beneficial than the lower R_DS,on resistance. This is the point where my lack of experience shows...IMHO the zener diode suggested by JohnC430 isn't really required, the voltage divider will clamp the voltage anyway. The zener diode becomes important if the device should be suitable for different supply voltages.
I like your design, especially because you choose discrete components, which are either widely available or have alternatives - perfect for the community! The only thing better is the excellent step by step design walk-trough, it was a very interesting read.While I definitely wouldn't consider myself experienced - I've never actually build a motor driver - I noticed that your driver pushes the gates quite hard, they are only rated for ±20V. There's an easy fix, just add a 2.2k resistor instead of the wire in between the pcbs to build a voltage devider.An other issue might be slow switching times, which causes both mosfets to conduct at the same time. Decreasing R1-4 to 1k will speed up this process ten times, cutting the switching losses down to 1/10. In my designs I usually use a push-pull driver right infront of the gate, this reduces the output impedence easily by about 200-300. If the temperatures are fine though, there's no need to worry.Do you have a project in mind which requires this driver?
Obviously yes, the longer you charge a device, the more energy will be stored. However this is only true if the batteries stillhave some energy left.
The phone may have a battery with about 8-12Wh, the 9 volt battery about 4.5Wh. The total efficiency can be estimated to about 60% (75% efficient car charger adapter, 90% efficient charging circuit within the phone, and a little loss in the cable). So this give you about 20-30% of charge.
I wasn't aware that it is this simple, I'm interested in part 2 as well!Did you try adding a decoupling capacitor near the RF module? I'd guess the step up module produces quite a bit of ripple which may interfere. A low power LDO might also help.And +1 for Realterm, used it a lot for debugging a USB virtual serial device.
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.