Author Topic: Hello World  (Read 38506 times)

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Offline bumba000Topic starter

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Re: Hello World
« Reply #25 on: October 15, 2015, 07:26:49 pm »
Do you know how many hours it takes to produce those 3D models and pull the reulting JPG off it, you think i put one up for every value ?

Hey Simon, your image looks great. You've done a fine job.

I am a bit confused though. With all the work that you've done to create the image you must know that changing each color could be incredibly simple using the right program and tool. Do you happen to have Adobe Fireworks or Photoshop? I can make it very easy for you to change the color of each band if you'd like.

I don't mean to butt in, just trying to be of assistance.

John
 

Offline Simon

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Re: Hello World
« Reply #26 on: October 15, 2015, 07:33:41 pm »
Hello John, it's a discussion forum, you are free to suggest and discuss. I could just as easily colour each band on the model before producing the image, it's just not really worth the hassle as for the multi item listings i then have tens of images for one listing which probably puts me over the image limit and it takes a very long time. It's not just the time to produce the images but the time to manage the listings. It's like a design job at work, I can spend more time doing the paperwork than the model.

of course i have used the same incorrect image for the 1% values I mostly stock as they should be 5 band with a brown tolerance band but they have the same 1K 5% image, probably the most manufactured and sold value.

When it comes to surface mount models they have the added benefor that I could use them in Diptrace as I do export my boards to 3D cad where they fit into the mechanical assembly, so nice models that are correct and have rounds are better than the models diptace carries as standard that were made in wings 3d which does not support curves.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #27 on: October 15, 2015, 07:46:16 pm »
I figured if you wanted a different image for each value that you should be able do it yourself, just figured I'd offer just in case. Then I had also considered the multiple listings... With just one image you can make just one listing and give the customer a list of options of values. Great! That's exactly what I would do. Your work looks great and they should sell just fine for you.
 

Offline Rick Law

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Re: Hello World
« Reply #28 on: October 15, 2015, 08:40:37 pm »
As a smoker, I would offer help with your E-Cig project.  It sounds really interesting to use FTDI cable for E-cig.  But I am really busy splitting my 2M Ohm resistor into 20 100K resistors.  I don't want to use up an entire 20MOhm in one shot...
 

Offline zapta

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Re: Hello World
« Reply #29 on: October 15, 2015, 08:44:10 pm »
As a smoker, I would offer help with your E-Cig project.  It sounds really interesting to use FTDI cable for E-cig.  But I am really busy splitting my 2M Ohm resistor into 20 100K resistors.  I don't want to use up an entire 20MOhm in one shot...

You can use resistors to create smoke. They are pretty cheap.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #30 on: October 15, 2015, 08:54:05 pm »
As a smoker, I would offer help with your E-Cig project.  It sounds really interesting to use FTDI cable for E-cig.  But I am really busy splitting my 2M Ohm resistor into 20 100K resistors.  I don't want to use up an entire 20MOhm in one shot...

The purpose of the FTDI cable is to help see what the present PWM frequency of the atmega328 is. Using the pro trinket board that I'm using which is the 3.3V version out of the box it's PWM frequencies are 75% of the 5V version. So there was a bit of coding that I do not yet understand to increase the frequency from 750Hz to 100kHz. Apparently a sound card oscilloscope can not handle frequencies this high so I can't see what new frequency is that's been set in code. I will need another way of measuring it. I was told to use my FTDI cable to see the frequency. Not sure how that's going to work, but it sure beats a $300 oscope if it does work. If not, well I still end up with an FTDI cable.

These are the parts that I'll be using for the ecig and they will be here tomorrow.

https://www.digikey.com/product-detail/en/IRLR6225TRPBF/IRLR6225TRPBFCT-ND/2538170

https://www.digikey.com/product-detail/en/SRP1770TA-2R2M/SRP1770TA-2R2MCT-ND/5429726

https://www.digikey.com/product-detail/en/RR71C101MDN1/493-3716-ND/2207252

https://www.digikey.com/product-detail/en/VB20100S-E3%2F8W/VB20100S-E3%2F8WGICT-ND/1543677

https://www.digikey.com/product-detail/en/IRLR7843TRPBF/IRLR7843PBFCT-ND/812583

I've already built a circuit based on the MAX1523 boost chip which works but doesn't put out nearly enough power even with the new super high PWM frequency.

I'm not running an ecig from my sound card. I'm not running an ecig from an FTDI cable.  |O
« Last Edit: October 15, 2015, 08:57:10 pm by bumba000 »
 

Offline Rick Law

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Re: Hello World
« Reply #31 on: October 15, 2015, 10:12:01 pm »
As a smoker, I would offer help with your E-Cig project.  It sounds really interesting to use FTDI cable for E-cig.  But I am really busy splitting my 2M Ohm resistor into 20 100K resistors.  I don't want to use up an entire 20MOhm in one shot...

The purpose of the FTDI cable is to help see what the present PWM frequency of the atmega328 is. Using the pro trinket board that I'm using which is the 3.3V version out of the box it's PWM frequencies are 75% of the 5V version. So there was a bit of coding that I do not yet understand to increase the frequency from 750Hz to 100kHz. Apparently a sound card oscilloscope can not handle frequencies this high so I can't see what new frequency is that's been set in code. I will need another way of measuring it. I was told to use my FTDI cable to see the frequency. Not sure how that's going to work, but it sure beats a $300 oscope if it does work. If not, well I still end up with an FTDI cable.
...

Ahem, sorry, misunderstood.

Do you have a DMM with frequency capability?  My UT61E ($60 range) measured an MCU's pwm output rather nicely.  In fact, easier and better than my Hantek 6022BE 20MHz ($80).  My scope uses 8bit ADC and gives me only 2-3 digit resolution whereas my DMM has four digits resolution and much better accuracy than the scope.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #32 on: October 16, 2015, 06:35:16 am »
Hey Rick, I missed your response. No I don't. I have an UEI DM383B, a GE GE2524 and an 72-8155 LCR meter. I'm thinking about one of them build your own Oscope kits from ebay that comes as a hundred parts with a 2.4" oled screen. They're only like $25 and it'll keep me busy for a day or so.

Also, I'm in NW Pennsylvania. So in the meantime if anyone with an oscilloscope is near by and wouldn't mind putting my project on test I sure would appreciate it.

Thanks, John
« Last Edit: October 16, 2015, 06:37:06 am by bumba000 »
 

Offline alsetalokin4017

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Re: Hello World
« Reply #33 on: October 16, 2015, 07:17:38 am »
It sounds like you are committed to the hobby... so you need a real oscilloscope. You should be able to find a good used analog scope in the 60-100MHz bandwidth region for under 200 dollars (Ebay, Craigslist, university surplus, etc.) , or bite the bullet and get something like a 400 dollar Rigol DS1054Z. Why waste your time on toys? (Although some might say that the Rigol is a "toy".... it is fun to play with, after all....)

It has often been said that the Lathe is the "King of Tools" ... so the oscilloscope is the "King of Test Equipment." You neeeeeeed one.
« Last Edit: October 16, 2015, 07:21:08 am by alsetalokin4017 »
The easiest person to fool is yourself. -- Richard Feynman
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #34 on: October 16, 2015, 02:27:06 pm »
Oh yeah, I've been window shopping, but unfortunately my wife doesn't quite feel the same way as I do about all of this and she certainly doesn't see the need for a $200 oscilloscope.  :'(
 

Offline Simon

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Re: Hello World
« Reply #35 on: October 16, 2015, 04:22:05 pm »
nothing will replace a proper oscilloscope. Keep an eye on ebay for something second hand. DON'T buy OWON they are crap, the PSU has failed in mine although it could be something as stupid as the NTC
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #36 on: October 16, 2015, 05:13:09 pm »
How is this diode used? http://www.vishay.com/docs/88975/v20100s.pdf
I have the TO-263AB version. I'm pretty sure I understand the right leg is Anode, left is cathode and bottom/back is heatsink contact. will the A or C ever make contact with K?

Also, can this mosfet be used in the positive side of the circuit? http://www.irf.com/product-info/datasheets/data/irlr6225pbf.pdf

Thank You, John
 

Offline Simon

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Re: Hello World
« Reply #37 on: October 16, 2015, 05:35:08 pm »
How is this diode used? http://www.vishay.com/docs/88975/v20100s.pdf
I have the TO-263AB version. I'm pretty sure I understand the right leg is Anode, left is cathode and bottom/back is heatsink contact. will the A or C ever make contact with K?

Also, can this mosfet be used in the positive side of the circuit? http://www.irf.com/product-info/datasheets/data/irlr6225pbf.pdf

Thank You, John

Oh where to start I'm not sure what you mean by the C pin for the diode. You have an anode and cathode. The cathode is generally represented with a K and is the negative side of the diode. The anode is the positive side of the diode represented by an A.

For simplicity's take you do not want to be using an N channel MOSFET on the positive side of the circuit. Technically it's possible but given your level of understanding I would use a the channel for the minute.
 

Offline Rick Law

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Re: Hello World
« Reply #38 on: October 16, 2015, 06:33:06 pm »
Hey Rick, I missed your response. No I don't. I have an UEI DM383B, a GE GE2524 and an 72-8155 LCR meter. I'm thinking about one of them build your own Oscope kits from ebay that comes as a hundred parts with a 2.4" oled screen. They're only like $25 and it'll keep me busy for a day or so.

Also, I'm in NW Pennsylvania. So in the meantime if anyone with an oscilloscope is near by and wouldn't mind putting my project on test I sure would appreciate it.

Thanks, John

John, I appreciate your enthusiasm.  The "No I don't" I suppose is the answer to my question: "Do you have a DMM?"

If so, I suggest you get a DMM first before you start touching the oscilloscope kit.  I too am new (2yr-ish") with this electronic thing as a hobby, I found my DMM the most valuable measurement device in my collection.  Even if you just get the eBay $1 DMM (with shipping=$5), it still would be better than no DMM at all in my view.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #39 on: October 16, 2015, 06:45:30 pm »
thanks rick. I have a total of 4 digital multimeters.

As for the N-Mosfet, www.irf.com/product-info/datasheets/data/irlr6225pbf.pdf

Please help me understand why I connect my
DMM positive lead to my battery +
battery negative to mosfet Drain
my DMM negative lead to the mosfet Source I get a voltage

I have nothing connected to the gate but it's still passing through a voltage. I thought I had the fet backwards but I do not. I tried it backawrds and still have voltage pass through. It's less but still voltage. What am I missing here?

Thank You, John
« Last Edit: October 16, 2015, 06:49:39 pm by bumba000 »
 

Offline Simon

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Re: Hello World
« Reply #40 on: October 16, 2015, 06:48:29 pm »
Look at the symbol of the FET you have a diode in parallel. If you connect it "back to front" it will work just like a diode albeit a bad one.

Most semiconductors are not perfect isolators when off and could still conduct current. Your multimeter has a very high input impedance so even with a high impedance across the drain and source of your FET you could register a voltage. The other thing which is even more likely is that static is triggering your gate or partly triggering it. Connect a resistor between the gates and source and then try again. Most likely you will read nothing.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #41 on: October 16, 2015, 06:51:18 pm »
I've tried the resistor (pull down) 100k, it didn't seem to have an effect. What size would you recommend?
« Last Edit: October 16, 2015, 06:53:03 pm by bumba000 »
 

Offline Simon

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Re: Hello World
« Reply #42 on: October 16, 2015, 06:52:23 pm »
well even 1M should do it but you can also use no resistor and short it
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #43 on: October 16, 2015, 06:58:39 pm »
a resistor isn't doing the trick, a direct short isn't doing the trick and there's enough, current/voltage/power (whatever) there to light an LED. Oh my gosh!
 

Offline Simon

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Re: Hello World
« Reply #44 on: October 16, 2015, 06:59:35 pm »
it could also be that you have damaged it with static from your body.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #45 on: October 16, 2015, 07:04:19 pm »
connecting the mosfet backwards, where S = battery NEG, D = led NEG the led doesnt light up. connecting my pwm to the gate the led turns on. Im at a complete loss here.
 

Offline Simon

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Re: Hello World
« Reply #46 on: October 16, 2015, 07:06:30 pm »
I think by backwards you mean the right way around, what supply voltage are you using ? an LED needs to be current regulated with a resistor at least.

I suggest you look up mosfets on google (or just hit wikipedia) and read how they work, just messing about with it will not test you much before you blow it up.
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #47 on: October 16, 2015, 07:09:34 pm »
I seem to get confused often and I'm trying to come up with a way to remember.

What I think is correct is this. N channel: Drain from battery proving source to circuit. Correct?

Now, I've just taken a brand new fet from the static bag and connected it as stated above with the circuit again being the LED. It does not light up. I connect my PWM to the Gate and it stinking works!
 

Offline bumba000Topic starter

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Re: Hello World
« Reply #48 on: October 16, 2015, 07:38:17 pm »
is there an off switch on these things? LOL, I mean seriously, I just can't seem to get this right. I'm going to stop bothering you all with my apparent stupidity now I just figured I'd toss this out there.

Same as before using either of two brand new mosfets;
18650 battery NEG to Fet Drain, from Fet Drain to LED Neg, from LED Pos to Bat Pos and the LED is lit up. I can not make it turn off. I thought it should be off unless I trigger the gate with a positive voltage.

I'm ready to chew the mosfets to pieces!
 

Online Mechatrommer

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Re: Hello World
« Reply #49 on: October 16, 2015, 08:01:36 pm »
LOL, I mean seriously, I just can't seem to get this right. I'm going to stop bothering you all with my apparent stupidity now I just figured I'd toss this out there.
the oppression of the beer has diminished, beer and fet is not a good mix... welcome to the club of the magic smokers...
edit: err i meant, excessive amount of...
Nature: Evolution and the Illusion of Randomness (Stephen L. Talbott): Its now indisputable that... organisms “expertise” contextualizes its genome, and its nonsense to say that these powers are under the control of the genome being contextualized - Barbara McClintock
 


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