Anybody know where I could find a 30 watt audio amp with a supply voltage of ~12 volts (for a car)? That or I could figure out how to up the voltage (wouldn't be hard either).
I just found out that I have 2 bi-polar stepper motors lying around, now I looked up on how to control them with the arduino and every example I see is using this : [url]http://datasheet.octopart.com/SN754410NE-Texas-Instruments-datasheet-43537.pdf[/url]
is there any way to control a bipolar stepper motor without using a ic ? as in discrete components only ?
[QUOTE=quincy18;31265806]I just found out that I have 2 bi-polar stepper motors lying around, now I looked up on how to control them with the arduino and every example I see is using this : [url]http://datasheet.octopart.com/SN754410NE-Texas-Instruments-datasheet-43537.pdf[/url]
is there any way to control a bipolar stepper motor without using a ic ? as in discrete components only ?[/QUOTE]
Yes, use transistors.
[QUOTE=Chryseus;31266138]Yes, use transistors.[/QUOTE]
Could you point me in the right direction ? As in circuits / tutorials etc.
Just looked into this and it seems like I just need to make 2 h-bridge circuits right (per motor)? and then I can write my own library to control this thing
what happend to automerge :O ?
[QUOTE=quincy18;31269837]Just looked into this and it seems like I just need to make 2 h-bridge circuits right (per motor)? and then I can write my own library to control this thing
what happend to automerge :O ?[/QUOTE]
Posts don't merge if they're an hour or more apart.
This probably belongs in H&S tech support but this is a thread full of people likely to know the answer so I might as well post here.
There's been a lot of thunderstorms and lightning around here all summer. Some time ago I bought [url=http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=P5B-GR&ISOCountryCode=GB]this pretty cheap APC surge protector[/url] and while the product page does say it protects against lightning, i wonder just how well? (full specs in the link) It was pretty cheap afterall and if it's no good, how much money do I need to spend to be protected from lighning strikes?
[QUOTE=chipset;31288656]This probably belongs in H&S tech support but this is a thread full of people likely to know the answer so I might as well post here.
There's been a lot of thunderstorms and lightning around here all summer. Some time ago I bought [url=http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=P5B-GR&ISOCountryCode=GB]this pretty cheap APC surge protector[/url] and while the product page does say it protects against lightning, i wonder just how well? (full specs in the link) It was pretty cheap afterall and if it's no good, how much money do I need to spend to be protected from lighning strikes?[/QUOTE]
Equipment protection policy
Lifetime : 50000 Euros
If it doesn't work, it looks like they will replace anything connected to it up to €50k. Which means it is probably going to work.
[QUOTE=Xera;31288928]Equipment protection policy
Lifetime : 50000 Euros
If it doesn't work, it looks like they will replace anything connected to it up to €50k. Which means it is probably going to work.[/QUOTE]
Yes but is the protection enough for lightning? If it's only specified to cover normal power surges then that 50k euro ensurance means nothing in the event of lightning.
The product specifications say:
[img]http://filesmelt.com/dl/fdsa9gh875y3hg.PNG[/img]
Pretty vaguely worded, doesn't say anything specifically about protecting about lightning.
It's under "Features" so I would assume it is. Call them or something.
I was hoping someone would have a look at the technical specifications and say to which degree it would protect from lightning.
I got all kinds of Sparkfun-Electronics for documentation and writing AVR code (I didn't get it from Sparkfun)
Surge protectors will all survive lightning to a certain degree, this is usually given by the surge energy rating and the peak current, which in the one you have shown is 960 joules and 13kA also surge protectors have a let through voltage rating, which means a spike below this rating will be let though into the protected device.
The one you have showed is not a particularly good surge protector, the peak current is fairly low and the let through voltage rating is ridiculous, a 800V spike could easily get though.
However in my opinion surge protectors are rather useless, unless you get power line strikes often there is usually no need for one, in addition most switch mode power supplies contain built in surge protection.
Success ! Made a H-bridge with
2 pnp transistors
2 npn transistors
4 1N4001 diodes
and 4 1k resistors.
Pic (warning my mobile makes pictures with a resolution of 3000 * 2000 so I quoted it)
[QUOTE][IMG]http://i.cubeupload.com/pfQbZ7.jpg[/IMG][/QUOTE]
[editline]24th July 2011[/editline]
Going to build a little work station tomorrow, found some left over mdf in the shed.
What should a proper work station include other then the obvious soldering iron stand ? I was thinking about attaching some chloth pegs to it to hold circuits and such.
Ideas anyone ?
Now make a MOSFET H-Bridge.
[QUOTE=DrLuke;31312922]Now make a MOSFET H-Bridge.[/QUOTE]
For what purpose should he use MOSFET's ?
Choosing between a Bipolar or FET H-bridge isn't just a simple decision, it depends very much on what you intend to do with it, each has their advantages and disadvantages but I'll leave that to you to figure out.
[QUOTE=Chryseus;31313027]For what purpose should he use MOSFET's ?
Choosing between a Bipolar or FET H-bridge isn't just a simple decision, it depends very much on what you intend to do with it, each has their advantages and disadvantages but I'll leave that to you to figure out.[/QUOTE]
Well, FETs obviously can control more current and also need less power to drive it. The only obvious downside for H-Bridge-usage would be that the gate voltage would have to be atleast the source-voltage, but that can easily be managed with a bipolar transistor controlling the gate.
[QUOTE=DrLuke;31313844]Well, FETs obviously can control more current and also need less power to drive it. The only obvious downside for H-Bridge-usage would be that the gate voltage would have to be atleast the source-voltage, but that can easily be managed with a bipolar transistor controlling the gate.[/QUOTE]
Sorry what ? you clearly don't understand how MOSFETs work, you're also forgetting that MOSFETs have a much higher capacitance and drain-source on impedance compared with BJTs all of which needs to be taken into consideration when designing anything using transistors.
You can't just arbitrarily pick parts when it comes to designing things, doing so is asking for trouble particularly when it comes to analog circuits.
I have arduino too so add me on the list.
[QUOTE]bobiniki - Arduino Duemilanove, Arduino Duemilanove and Arduino Serial v2.0[/QUOTE]
All 3 are with ATmega328 chip
[QUOTE=bobiniki;31365626]I have arduino too so add me on the list.[/QUOTE]
Done.
[QUOTE=Chryseus;31365700]Done.[/QUOTE]
Thx.
I'll later or tomorow post a big post with pictures with the project im working on.But for now ill only say that i'm doing a people counter with arduino and 2 lazers that count people going in or out and how manny people are in a room.
worked with the boe-bot in school, need to buy me one, I had built myself a fleet of bots, hey, no one else was going to use them, also, which would you sugest, the serial or USB one, wondering because I can use the serial port to communicate between bots, and not sure if I can with the USB one
Won't the usb-version just have an FTDI chip on it to interface USB with serial?
[QUOTE=DrLuke;31375255]Won't the usb-version just have an FTDI chip on it to interface USB with serial?[/QUOTE]
Why does everyone keep talking about the FTDI RS232 chip, there are plenty of other USB-UART chips out there that do a better job and are cheaper.
[quote=viperfan7]not sure if I can with the USB one[/quote]
You should be able to, however ultimately it will depend upon the software and the chip used to provide the USB interface.
[QUOTE=Chryseus;31393196]Why does everyone keep talking about the FTDI RS232 chip, there are plenty of other USB-UART chips out there that do a better job and are cheaper.
You should be able to, however ultimately it will depend upon the software and the chip used to provide the USB interface.[/QUOTE]
Because the arduino made it a rather popular commonly known chip?
[QUOTE=Chryseus;31393196]Why does everyone keep talking about the FTDI RS232 chip, there are plenty of other USB-UART chips out there that do a better job and are cheaper.[/QUOTE]
Availability is an important quality. Is it really worth it to save a nickel on your BoM by choosing the cheaper (and probably more obscure) part when it's not guaranteed to be around in another year or so? At the very least, the popularity of the FTDI devices ensures they'll have a pretty long run.
Nickels add up when you're making thousands of units, but for the hobbyist you'd rather have a design that's going to last a while.
Finished hacking up a broken(ish) old Dell psu to use a desktop supply. Working nicely at the moment, hopefully it won't fail miserably under larger loads... Here it is hooked up to an atmega32 which I also just got working with a usbtinyISP.
[img]http://i.imgur.com/weaVy.jpg[/img]
[QUOTE=Little Green;31407847]Finished hacking up a broken(ish) old Dell psu to use a desktop supply. Working nicely at the moment, hopefully it won't fail miserably under larger loads... Here it is hooked up to an atmega32 which I also just got working with a usbtinyISP.[/QUOTE]
The job you've done on the case looks really nice, although you are missing the -12V which can be rather handy despite its low current.
You should be aware that switch mode supplies tend to have rather high levels of noise so it would be no good for analog signal stuff like high gain amplifiers.
You might also want to make a programming board for the atmega like I did some time ago with a proper IDC connector for the ISP, it makes life a lot easier.
Sadly the power supply didn't have -12V to tap into (that I could find), just two different coloured +12V. The noise shouldn't be too bad for most of the things I can see myself using it for, so it should serve me well as a general purpose supply.
And yes I definitely need to get around to making something with a proper connector, the clusterfuck of wires gets tiring. This is the first thing I've made not using the arduino, I have a whole bunch of components ready for a couple of projects - Now I just need to learn how to use them :v:
So I found my Arduino recently, can anyone recommend anything short/fun to do with it?
Sorry, you need to Log In to post a reply to this thread.
