Homemade 4 in 1 test instrument - Page 1
Forum section: electronics / projects

author: moffy
author_rank: Super Contributor
timestamp: July 22, 2015, 01:53:16 am
content: I had a few parts lying around that I had ordered from Ebay, 2 by: "5 digit Digital Volt/Panel meters";http://www.ebay.com.au/itm//5-Digit-Grun-LED-DC-0-4-3000-33-000V,1 by: "DDS Signal Generator";http://www.ebay.com.au/itm/DDS-signal-source-generator-module-double-channel-TTL-driver-IGBT-ADCmeasurement-/261567074628?pt=LH_DefaultDomain_15&hash=item3ce69cd144,and finally a power supply for +5v,3.3v and -5v which I built using some low drop out regulators and a 0v,6v,12v RMS transformer I already had.They needed a home so more by luck than by planning I bought the right sized case, on special from Jaycar, and managed to incorporate all the above bits and pieces. It saves quite a bit of space. It is also fairly useful as it puts a few items together that are commonly used into a single package. The signal generator gets its power from the +5v supply, and the 2 DPMs get their power from 4xAAA cells each and are separately switched, making them fully floating and independent. The wiring is not very neat, so please forgive that. I also installed everything in the case upside down, but it doesn't matter. Most of the wiring for the front panel is on the front panel, it is only the mains switch, easily removed, and the power supply wires that go off the front panel. Makes it easy to work on.

author: lincoln
author_rank: Regular Contributor
timestamp: July 22, 2015, 09:00:43 pm
content: links are el broken

author: moffy
author_rank: Super Contributor
timestamp: July 22, 2015, 11:43:10 pm
content: Thanks. Any advice on a site for posting photos here? I have added the photos as attachments.

author: Muttley Snickers
author_rank: Unknown
timestamp: July 23, 2015, 12:14:48 am
content: Quote from: moffy on July 22, 2015, 11:43:10 pmI've recently asked a moderator about this question and only ever posted a few full size images which seem to increment the view counters every time the pages are refreshed and I've noticed that depending on the manner in which the pictures were submitted determines how they finally look, some other pictures I've seen dont have the view counter when enlarged, I dont know how this is achieved otherwise as you have done just include the pictures as attachments which seems to be the first step in the process anyway.The way it was explained to me is as follows: prepare your reply or post and attach your pictures then submit the post, go back to the post check and see if all looks good then open a picture and copy it's url, go back in and modify the post and use the insert image icon and paste the pictures url between the  here  then resubmit the post and the nominated picture should be full size and this aspect can be varied apparently, I'm yet to master that bit, others may have better solutions in regards to posting pictures although the moderator confirmed that the method I've been using is correct, if not I will come back and edit this post, limits 1000kb per picture and 2000kb per post and if you try to post a picture that is larger than 1000kb then you need to thoroughly get rid of any reference to it in your submission, this caught me out and I had all sorts of trouble and could not get rid of "the image is too big" popup.Back to topic, can you provide some details on the panel meters as the link or page was no good, physical size in metric, operating voltage and maybe a better indcation on where you got them from.Many ThanksMuttley

author: moffy
author_rank: Super Contributor
timestamp: July 23, 2015, 12:33:32 am
content: Thanks for the info. The link for the panel meter has been updated, should work now.

author: Muttley Snickers
author_rank: Unknown
timestamp: July 23, 2015, 12:50:37 am
content: Just testing this method, thanks to Wilfred....

author: moffy
author_rank: Super Contributor
timestamp: July 23, 2015, 01:02:15 am
content: Works very nicely, thanks.