Eye Candy  - Page 1
Forum section: electronics / general

author: t_ryner
author_rank: Regular Contributor
timestamp: May 11, 2017, 12:34:59 am
content: These are some links to the photos I took of some co-ax input circuits from some old CRT Tvs. They are like art! The winding traces, the colorful coils- just eye candy to me. By using this link, I can share these photos in their full glory, and avoid exceeding the file size for the site. As long as you have a Gmail account, this will work.-https://drive.google.com/open?id=0B0T3gelonW2VUnZ0N0xOU21MTDA-https://drive.google.com/open?id=0B0T3gelonW2VMzRMcWE3eW94T2s-https://drive.google.com/open?id=0B0T3gelonW2VZ1VCRU54cVJsb2c-https://drive.google.com/open?id=0B0T3gelonW2Vb09WYzB1Ri02ekE( I am using a school chromebook, and do not have access to editing software. Yes, I could try downloading some, but schools tend to disable things they don't understand)Enjoy!

author: Vgkid
author_rank: Super Contributor
timestamp: May 11, 2017, 12:54:07 am
content: Your pictures work for me.Interesting seeing all of the smd parts. Guessing that since the tv is crt based, it is all through hole.

author: t_ryner
author_rank: Regular Contributor
timestamp: May 11, 2017, 01:03:56 am
content: Indeed. Another interesting detail is that the inductors (I think) are hollow. One of them has strange traces. I could post some more too, but the new ones are more compact.

author: james_s
author_rank: Super Contributor
timestamp: May 11, 2017, 01:05:37 am
content: There were lots of SMD parts in later CRT TVs, starting around the mid 90s it got fairly common. Lots of through-hole too but a fair amount of SMD on the underside of the board and on various modules including the tuner.

author: Brumby
author_rank: Unknown
timestamp: May 11, 2017, 01:16:42 am
content: For those without a Google account:

author: yada
author_rank: Frequent Contributor
timestamp: May 11, 2017, 02:26:54 am
content: Quote from: t_ryner on May 11, 2017, 12:34:59 amEDIT: That didn't work. I was trying to get all your pictures displayed with out redirects.But It looks like some one beat me to it.What "vintage " is that beast? Good for scrap parts?Is that early 80's? Odd SMD...

author: xrunner
author_rank: Super Contributor
timestamp: May 11, 2017, 02:29:15 am
content: They look like little cities with streets and buildings.

author: Muxr
author_rank: Super Contributor
timestamp: May 11, 2017, 02:36:13 am
content: Interesting to see wavy matched traces. I guess for RF it makes sense.

author: yada
author_rank: Frequent Contributor
timestamp: May 11, 2017, 02:39:40 am
content: Quote from: xrunner on May 11, 2017, 02:29:15 amI always used to think that when I was taking them apart when I was a kid, Then we would tie some type of gunpowder charge to it and see how much of the city would be leveled and at what height. Very scientific, actually it was; we made little strain gages and mini bikini g force plates. In case of an attack you are best hidden with in a relay or transformer.

author: rdl
author_rank: Super Contributor
timestamp: May 11, 2017, 04:18:12 am
content: Quote from: Muxr on May 11, 2017, 02:36:13 amThese may date back to when boards were basically drawn by hand and tape was used to lay down traces.

author: Cubdriver
author_rank: Unknown
timestamp: May 11, 2017, 04:33:36 am
content: Quote from: rdl on May 11, 2017, 04:18:12 amI doubt they're that old - I'm pretty sure that tape was out before SMD was in. A lot of my old 60s era HP gear has what appear to be tape and vellum art boards, but I think that method (at least commercially) had gone the way of the dinosaur before surface mount stuff became mainstream.Here's a link to a pic of an old 'tape' board:https://pmanning.smugmug.com/Electronics/HP-3440A-DVM/i-hXGjLNQ/A-PatOP, cool photos! It's always neat to see closeups of this sort of thing.-Pat

author: TerraHertz
author_rank: Super Contributor
timestamp: May 11, 2017, 09:48:27 am
content: I love TV tuners too. Beautiful RF wizardry!OP's photos made me finally look up what MELF means. I knew they are called that, but not what it stands for.https://en.wikipedia.org/wiki/Metal_electrode_leadless_face

author: Miyuki
author_rank: Frequent Contributor
timestamp: May 11, 2017, 11:52:32 am
content: Old tuners are lovely, even better in pre IC eraAll these nice tiny colorful coils poured in wax//edit:like this one with lot of manually tuned coils, must be insane job to poke coils all dayhttp://upload.wikimedia.org/wikipedia/commons/9/9e/Tuner2001.jpg

author: CJay
author_rank: Super Contributor
timestamp: May 11, 2017, 02:48:58 pm
content: They're all pretty modern, but SMD has been around for a *long* time, it was definitely around when I was repairing tellies as a 17 year old and I'm 49 this year.The really pretty ones had nary an IC in sight, there's a schematic of one of the (later) ones I used to repair here:http://www.philipstv.org.uk/blog/early-philips-colour-tv/g8/g8-electronics/and there were plenty of others earlier than that, some with valves/tubes, some with germanium transistors working up around 900MHz, others were Machiavelliean works of mechanical torture...

author: Gyro
author_rank: Super Contributor
timestamp: May 11, 2017, 03:19:58 pm
content: QuoteHaha, yes those were fun to play with. I remember there was a mod to turn the transistor ones into UHF TV sound converters, by modding the LO to bring the IF up into the FM broadcast band - one of the shops on the Edgeware Road sold modified ones. It was mono of course, but a lot better quality than you could get by tapping into the back of the TV (particularly live chassis ones!). I had lots of fun tweaking the coupling strips and end vanes of the multi-gang tuning cap, that ran the length of the tuner between the individual tuned cavities, to try to get best selectivity. I think I gave up after the third tuner and left it as was.Edit: Just the right amount of black magic for a mass produced device....http://hackaday.com/2016/07/11/not-quite-101-uses-for-an-analog-uhf-tv-tuner/

author: BravoV
author_rank: Super Contributor
timestamp: May 11, 2017, 05:28:22 pm
content: Colorful candies , and socketed 2N3904 ..More candies andcoilsshiny springy thingies ...Gold .. gold .. everywhere ...More ->HERE

author: Cubdriver
author_rank: Unknown
timestamp: May 11, 2017, 06:08:22 pm
content: How about some nests of wire:-Pat

author: Gyro
author_rank: Super Contributor
timestamp: May 11, 2017, 07:08:29 pm
content: That one looks as if it was taken at sunset

author: yada
author_rank: Frequent Contributor
timestamp: May 12, 2017, 07:09:16 am
content: Quote from: Miyuki on May 11, 2017, 11:52:32 amWhen I was a kid I used to think that the odd spaced coils were just the result of incompetent factory workers. I remember the ones that were hand tuned then stuffed with foam and wax was poured over them. That job would make me want to be homeless. They were in those cheapo transistor radios so you know the people couldn't have been paid very much.

author: t_ryner
author_rank: Regular Contributor
timestamp: May 12, 2017, 02:36:27 pm
content: That big one is from a curbside TV- a big one too. It was full of passive components, but I spared this beautiful board from the iron. I saved three more CRT boards recently, but the new ones are not as impressive- the cheap ones that is. They don't even have legitimate heatsinks! I'll post them later. not under this though (not eye candy)

author: NivagSwerdna
author_rank: Super Contributor
timestamp: May 12, 2017, 02:52:49 pm
content: Gold Plated Unobtainium

author: tggzzz
author_rank: Super Contributor
timestamp: May 12, 2017, 03:31:01 pm
content: Burr-Brown thick film hybrid ICs, and a faulty 'scope CRT.https://entertaininghacks.wordpress.com/category/pretty-pictures/

author: t_ryner
author_rank: Regular Contributor
timestamp: May 13, 2017, 04:22:10 am
content: Just found two interesting tuners. I do not have my camera with me currently, so I will post them in the morning. They use the same chip and layout yet are remarkably different. Featuring: the D400M "Doom" crystal, the SN76-1674 chip, and wacky RF wizardry!

author: technix
author_rank: Super Contributor
timestamp: May 16, 2017, 05:17:29 am
content: Quote from: NivagSwerdna on May 12, 2017, 02:52:49 pmHuge array of identical-looking 16-pin DIPS? Will those are likely RAM of some sorts. The identical 20-pin chips may be PALs.

author: RJFreeman
author_rank: Regular Contributor
timestamp: May 16, 2017, 06:36:23 am
content: Quote from: technix on May 16, 2017, 05:17:29 amI am guessing a counter of some sort?1820-0116 is a latch, 1820-0092 is a Nixi tube driver, while 1820-0732 is an unknown, but is mentioned in relation to counters....

author: technix
author_rank: Super Contributor
timestamp: May 16, 2017, 08:02:29 am
content: Quote from: RJFreeman on May 16, 2017, 06:36:23 amReasonable for a 8-digit instrument.

author: factory
author_rank: Super Contributor
timestamp: April 17, 2020, 10:56:32 pm
content: Quote from: NivagSwerdna on May 12, 2017, 02:52:49 pmLooks like the display board from a HP K20-5280A reversible counter, do you have the rest of it or just the display board?David

author: Cubdriver
author_rank: Unknown
timestamp: April 17, 2020, 11:26:43 pm
content: Some warm stuff:-Pat

author: flolic
author_rank: Frequent Contributor
timestamp: April 17, 2020, 11:54:14 pm
content: RGB

author: Cyberdragon
author_rank: Super Contributor
timestamp: April 18, 2020, 12:01:38 am
content: Only miniatures? Pfft...must haveMORE

author: Cubdriver
author_rank: Unknown
timestamp: April 18, 2020, 01:37:45 am
content: Quote from: Cyberdragon on April 18, 2020, 12:01:38 amOTL? 6AS7s? Nice!-Pat

author: Cyberdragon
author_rank: Super Contributor
timestamp: April 18, 2020, 07:45:01 am
content: Not my amp though (I wish I could afford nice gear), belongs to some big tube guy in Rossmann's discord.