Bought an Analogue Adjustable Powersupply - Page 1
Forum section: electronics / general

author: kolbep
author_rank: Frequent Contributor
timestamp: April 02, 2016, 03:53:55 pm
content: Impulse purchase on a South African Auction Site.An adjustable Analogue powersupply.Can set the 2 channels seperately, but they are joined in the center,So I can go from 0v to 100v, and a few amps.Already fried some LED's and Resistors playing around.Looks very homebrew, with the PCB that thas come unhotglued from the wooden spacers in the box,and the Transformer floating around.But once I fix those 2 things (and replace the power cord), what do you think of it. (Strange thing that the Opamps are not centered on the DIP sockets (pins 1 and 8 not connected), don't know why they did that?P

author: AF6LJ
author_rank: Unknown
timestamp: April 02, 2016, 04:23:22 pm
content: Wow they are not much for cutting off excess lead lenght......

author: SeanB
author_rank: Super Contributor
timestamp: April 02, 2016, 06:26:03 pm
content: Had a lot of TO100 10 lead sockets, so used those instead of the regular DIL8 sockets.With those industrial panel meters I would guess the builder was either employed by an industrial electrical contractor or was associated with a Technicon or college.

author: Seekonk
author_rank: Super Contributor
timestamp: April 02, 2016, 06:38:39 pm
content: Typical grad student construction.

author: mikerj
author_rank: Super Contributor
timestamp: April 02, 2016, 07:32:42 pm
content: Hand drawn PCB resist as well by the looks of itI remember those days fondly.

author: med6753
author_rank: Super Contributor
timestamp: April 02, 2016, 11:36:22 pm
content: It's amazing that it has such a nice case and front panel but the insides are a total disaster.

author: XOIIO
author_rank: Super Contributor
timestamp: April 03, 2016, 12:51:57 am
content: Quote from: med6753 on April 02, 2016, 11:36:22 pmAgreed, the front case looks quite nice, I was surprised at the internals as well. Perhaps someone re-did it at some point.

author: Brumby
author_rank: Unknown
timestamp: April 03, 2016, 01:22:33 am
content: Yes, the internals aren't pretty - but if they are solid, safe and functional then I wouldn't be too fretful. It might bother me for a while, but if it worked OK, the memory would fade a bit. Could never forget it, though.

author: rrinker
author_rank: Super Contributor
timestamp: April 03, 2016, 01:50:40 am
content: I cringe when I look at the internals of my senior lab project. The outside we made nice, nice case, neat labels on all the controls. Except for the power supply connection - just ran 2 wires out. I think it runs on 12V DC, maybe 5V. Been nearly 30 years. It's a total mess now, having banged around several moves and storage in less than ideal environments, and half the case is actually missing. The hot snot came loose and the boards are all flapping in the breeze. Once I get my bench set up I'll take some pictures, especially if it still powers up (I may have cannibalized a few of the socketed parts at one time). What was it? An LED matrix oscilloscope. A whopping 10x16 resolution. Might be good to 10KHz. It did work though, displaying recognizable sine and triangular waves, square waves don't work so well as the vertical parts tend to just be completely off, so all you see is the upper and lower levels with nothing connecting them.--Randy