Author Topic: Digital oscilloscope project/kit (Read 498492 times)

DMIOM · « **Reply #300 on:** April 03, 2016, 04:10:34 PM »

O/T re digital scope but these may be workshop-useful, has any tried one?

http://www.banggood.com/Low-ZVS-12-48V-20A-1000W-High-Frequency-Induction-Heating-Machine-Module-p-1038472.html

Definite scope for

Dave

RobWilson · « **Reply #301 on:** April 03, 2016, 04:39:38 PM »

Funny you should mention it Dave I bought the smaller one and promptly fryed it

Rob

seadog · « **Reply #302 on:** April 03, 2016, 04:43:05 PM »

Damn, I bought this a few days ago to play with - www.banggood.com/5V-12V-ZVS-Induction-Heating-Power-Supply-Module-With-Coil-p-1015637.html
I wish I'd seen the other one

kayzed1 · « **Reply #303 on:** April 03, 2016, 04:52:58 PM »

I have that one sat on the shelf, bit of a wimp so not plugged it in yet...just hope it does not go

Lyn.

Will_D · « **Reply #304 on:** April 04, 2016, 05:01:44 AM »

What don't they sell!

Looks like Banggood is the mad-modders ultimate toy shop!

I am having to sit on my hands when reading these threads!

John Rudd · « **Reply #305 on:** April 04, 2016, 06:05:03 AM »

Quote from: RobWilson on April 03, 2016, 04:39:38 PM

Funny you should mention it Dave I bought the smaller one and promptly fryed it

Rob

Whats broken on it Rob? I'm surecwe can fix it....

RobWilson · « **Reply #306 on:** April 04, 2016, 02:17:25 PM »

Quote from: John Rudd on April 04, 2016, 06:05:03 AM

Quote from: RobWilson on April 03, 2016, 04:39:38 PM
Funny you should mention it Dave I bought the smaller one and promptly fryed it

Rob

Whats broken on it Rob? I'm surecwe can fix it....

Sure mate , shall I stick it in the post

As you can see Bob has been at it

, I now have all the toys to desolder stuff ,,,,,,,,,,,,,,,,,sort of all the gear ,no idea

Smoke was emanating from between the two inductors .

So to see whats what you have to remove the two capacitors from underneath .

To remove the inductors ,

To get to the things that have had the ID scrubbed , for F*&k sake it a friggin toy , why!

These turned out to be N channel MOSFET,s

The diodes test OK

As do the resistors

So can the magic smoke be released and the heater stop working , then the parts test ok under no load ?

It died due to some tit not limiting the max current on his bench PSU

So that's the project , just build it bigger

Rob

wheeltapper · « **Reply #307 on:** April 23, 2016, 08:19:18 AM »

Hi people.
for those of you who have the scope kit I just received and fitted the plastic case kit and I have a few tips for you.

first thing is the LED at the bottom of the main board, this needs to be flush with the board or it will be squashed.
then, after the display part of the case is done and you fit the main board, there are 4 nuts to hold the board in place, DON'T tighten these up too much or the switches lock up. what I did was to run the nuts up so they touch the board then put locknuts on and lock them together.

this holds the board in place and also, the locknut comes flush with the side pieces of the case so when the back piece is fitted the rear nuts can tighten up without bending the plastic.

the only annoying thing is, at the top r/h side of the board is a two pin connector for the power supply, they forgot to leave a cutout in the case for this so it's inaccessible.

other than that it certainly protects the board and screen so I'm quite happy with it.

PS
by the way Rob, I seem to have accidentally ordered the airband receiver

I can't understand how that could have happened.

have fun guys.

Roy.

RobWilson · « **Reply #308 on:** May 02, 2016, 12:14:02 PM »

Quote from: wheeltapper on April 23, 2016, 08:19:18 AM

PS
by the way Rob, I seem to have accidentally ordered the airband receiver I can't understand how that could have happened.

have fun guys.

Roy.

Aye it happens Roy

, I still have to put my kit together

, So is it worth getting the plastic case for the DSO ?

Rob

wheeltapper · « **Reply #309 on:** May 02, 2016, 02:00:49 PM »

Hi Rob and welcome back.

yes, I think it's worth while, it protects the screen if nothing else.

I put my radio together yesterday and guess what, the damn thing doesn't work and one of the transistors seems to be getting rather warm.

Time to use all the skills I haven't got to try to fix it

Roy.

RobWilson · « **Reply #310 on:** May 02, 2016, 02:11:48 PM »

Cheers Roy

Oh ! any ideas whats wrong with it Roy ? , I will hang fire with my kit until you find out what's up with yours

Rob

PS , I was expecting to see snow on the hills around Edinburgh when we came into land

shipto · « **Reply #311 on:** May 02, 2016, 03:10:39 PM »

I reckon we should get a madmodder discount considering how much we are all spending there.

wheeltapper · « **Reply #312 on:** May 02, 2016, 03:24:49 PM »

Rob,
I haven't got a clue as yet.
I have to be in the right frame of mind to start trying to figure it out.

or I could send it to you to fix.

It's really annoying that of all these kits this is one I could use and it's bust.

ho hum.

Roy.

John Rudd · « **Reply #313 on:** May 02, 2016, 04:27:41 PM »

Roy,
Which tranny is getting warm?

Have you checked you got the components in the right way round?

Bluechip · « **Reply #314 on:** May 02, 2016, 05:19:51 PM »

Quote from: wheeltapper on May 02, 2016, 02:00:49 PM

one of the transistors seems to be getting rather warm.

Just write EF91 on it and call it a valve ... it'll be fine then ...

Dave

wheeltapper · « **Reply #315 on:** May 02, 2016, 05:36:03 PM »

It's the one designated U1 on board.
it's a 78LO8. same edge of the board as the BNC socket between two caps.

Roy.

nrml · « **Reply #316 on:** May 02, 2016, 05:39:29 PM »

After following this thread from the beginning, I have finally succumbed and gone and ordered the oscilloscope and transistor tester kits (with case). I have no idea how to use an oscilloscope and I have only ever soldered one small PCB before in my life. Such trivial details are not significant are they

? And to make matters worse I've ordered the version that needs SMD components soldering

.

Mr Wilson - you are a bad influence

. Giving people like me ideas above their station. Whatever next?

wheeltapper · « **Reply #317 on:** May 02, 2016, 06:04:18 PM »

Quote from: nrml on May 02, 2016, 05:39:29 PM

After following this thread from the beginning, I have finally succumbed and gone and ordered the oscilloscope and transistor tester kits (with case). I have no idea how to use an oscilloscope and I have only ever soldered one small PCB before in my life. Such trivial details are not significant are they ? And to make matters worse I've ordered the version that needs SMD components soldering .

Mr Wilson - you are a bad influence . Giving people like me ideas above their station. Whatever next?

SMD components eh. good luck with that.

If you've never used them before I suggest you get a test board as mentioned in a previous post, the're cheap enough to ~~screw up mutilate~~ construct and give some practice.

here's one, http://www.ebay.co.uk/itm/DIY-Kit-SMT-SMD-Component-Welding-Practice-Board-Soldering-Practice-UK-seller-/351548500382?hash=item51d9ec699e:g:V~MAAOSwT6pV36QW

It's all fun I tell you, well that's what they told me anyway.

Roy.

Bluechip · « **Reply #318 on:** May 03, 2016, 01:59:10 AM »

Quote from: wheeltapper on May 02, 2016, 05:36:03 PM

It's the one designated U1 on board.
it's a 78LO8. same edge of the board as the BNC socket between two caps.

Roy.

Little 8V 100mA voltage regulator .. Maybe a short cct. somewhere else on the board ??

They also get damned hot as do most regulator chips if you get them reverse connected.

Dave

http://uk.farnell.com/on-semiconductor/mc78l08acpg/ic-linear-voltage-regulator/dp/1652346

RobWilson · « **Reply #319 on:** May 03, 2016, 02:36:29 PM »

Quote from: nrml on May 02, 2016, 05:39:29 PM

After following this thread from the beginning, I have finally succumbed and gone and ordered the oscilloscope and transistor tester kits (with case). I have no idea how to use an oscilloscope and I have only ever soldered one small PCB before in my life. Such trivial details are not significant are they ? And to make matters worse I've ordered the version that needs SMD components soldering .

Mr Wilson - you are a bad influence . Giving people like me ideas above their station. Whatever next?

Good on ya nmrl

I am all brand new to this electronics lark myself , hardly used a soldering iron until I had started this thread

Rob

PS remember no photos it did not happen

RobWilson · « **Reply #320 on:** May 03, 2016, 02:38:24 PM »

Quote from: wheeltapper on May 02, 2016, 03:24:49 PM

Rob,
I haven't got a clue as yet.
I have to be in the right frame of mind to start trying to figure it out.

or I could send it to you to fix.

It's really annoying that of all these kits this is one I could use and it's bust.

ho hum.

Roy.

Me fix it Roy

I can desolder it for you

I am dam sure the more enlightened will work the problem out

Rob

RobWilson · « **Reply #321 on:** May 03, 2016, 02:54:35 PM »

Quote from: shipto on May 02, 2016, 03:10:39 PM

I reckon we should get a madmodder discount considering how much we are all spending there.

Aye should we

I got into work this morning to find a wee Banggood order has arrived while I was on holiday .

Rob

John Rudd · « **Reply #322 on:** May 03, 2016, 03:00:16 PM »

OFM.....what you been buying Rob?...

You should stop going on holiday...
I would have visited this w/e but you be out.....lol

RobWilson · « **Reply #323 on:** May 03, 2016, 03:01:26 PM »

Ok lads

A question for the electronics chaps , I would like to build a circuit that would charge up a bank of capacitors to anywhere between say 10v to 35v and when charged to the set voltage disconnect the power supply from the capacitor bank .

Any pointers ?

Rob

RobWilson · « **Reply #324 on:** May 03, 2016, 03:05:45 PM »

Quote from: John Rudd on May 03, 2016, 03:00:16 PM

OFM.....what you been buying Rob?...

You should stop going on holiday...
I would have visited this w/e but you be out.....lol

Just stocking up on a few bits mate

, capacitors ,transistors, trimmer pots ,perf board ,wee switches ands a peltier junction to play with , every project I look at I need parts

Where you at your daughter's over the weekend ?

Rob

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