TsT-Geo "effective protection against electromagnetic and geopathic smog" - Page 1
Forum section: electronics / general

author: ghorizo
author_rank: Contributor
timestamp: June 25, 2021, 05:54:03 am
content: Hello, thought it might be interesting to have a look inside one of these ridiculously overpriced gadgets I found on the road.The other side just has a CR2032 battery.Product page:http://tst-geo.comWhat's actually going on?How much do you estimate pcb cost?

author: Zero999
author_rank: Super Contributor
timestamp: June 25, 2021, 07:49:55 am
content: When you mean, you found it on the road, do you mean literally dumped, or at a roadside service station shop?This really belongs in the dodgy technology section, as it's a scam and doesn't do anything. It probably costs a couple of Euros to make at most.

author: ghorizo
author_rank: Contributor
timestamp: June 25, 2021, 10:08:16 am
content: Found it laying on the side of the curb, would never spend a cent for this clear fraud.I was just wondering what little was going on and how cheap they could produce it.They are selling these for 230-280 euros..And yes I should've posted in the dodgy technology section indeed, I forgot there was one. If a mod could move it there would be great.

author: Zero999
author_rank: Super Contributor
timestamp: June 26, 2021, 01:56:54 pm
content: Quote from: ghorizo on June 25, 2021, 10:08:16 amThe surface mount semiconductors are marked with codes I don't recognise. It wouldn't surprise me of most of them are unconnected. They might be cheap, fake/used/non-functional parts. I doubt there's anything worth salvaging. Dispose of it with any other electronic waste, as per your jurisdiction's law.

author: Simon
author_rank: Unknown
timestamp: June 26, 2021, 04:15:41 pm
content: someone went to great lengths on the PCB "artwork" with the hexagonal tracks. funny thing is that indeed the one used component would be the resistor at the top for the LED, to use any of the other parts would have "upset" the tri pattern scheme as 3 is a magical number and common in electrical stuff.

author: daqq
author_rank: Super Contributor
timestamp: June 26, 2021, 05:53:38 pm
content: According to:https://content.instructables.com/ORIG/F7O/81KO/HRBNDZLH/F7O81KOHRBNDZLH.pdfThe KNM F3 parts could be:https://www.diodes.com/assets/Datasheets/ds30171.pdf

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 27, 2021, 05:50:55 am
content: Do the vias actually connect through? If so it might be a ring oscillator, meaning it might actually be capable of producing some awful radio noise.

author: Zero999
author_rank: Super Contributor
timestamp: June 28, 2021, 09:50:13 am
content: Quote from: daqq on June 26, 2021, 05:53:38 pmThank you for that reference. It helped me identify some transistors on a relay board I blew up by connecting the power backwards. I shouldn't have assumed the black wire was negative.I destroyed an LM7805, which I replaced, but it still didn't work. The relays made a slight noise, but didn't pull in, because the driver transistors had been damaged, which reduced the hFE. Anyway, that reference helped because it saved me reverse engineering this thing, by telling me they're PNP.