What is this? - Page 1
Forum section: electronics / beginners

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: October 15, 2019, 11:44:26 pm
content: What is this thing?

author: bob91343
author_rank: Super Contributor
timestamp: October 16, 2019, 01:06:09 am
content: My wild guess is that it's something out of an electronic musical instrument. Have you tried energizing it?

author: ArthurDent
author_rank: Super Contributor
timestamp: October 16, 2019, 01:29:28 am
content: This might be a linear power supply with multiple outputs. The large heatsink has a metal bracket with a large round hole that could have been for mounting a fan for the output with the highest current, fused for 6A. There are three black heatsinks, two of which that are probably for a +/- supply, each rail fused for 1A. The last heatsink is for a forth output that is fused for 0.5A. There were probably 3 LEDs near the switch with the black "~" cap and one has broken off. The 3 LEDs were probably indicators for 3 of the outputs. This supply was probably removed from some piece of equipment that died and was used as a makeshift bench supply.

author: tkamiya
author_rank: Super Contributor
timestamp: October 16, 2019, 04:29:54 am
content: Looks like there are two very old fashioned IC on the board. What does it say? Looking that up should tell you what it is.I think it's a linear power supply like ArthurDent says.

author: DannyTheGhost
author_rank: Contributor
timestamp: October 16, 2019, 05:01:44 am
content: This board uses transformer that is specifically used for different vacuum tubes (multiple outputs of 6.3V).My best guess would be power supply board for anything from Soviet test equipment with CRT screen (starting from oscillocsope).

author: james_s
author_rank: Super Contributor
timestamp: October 16, 2019, 06:06:58 am
content: It looks Soviet to me, it's obviously a power supply of some sort, although I have no clue what from.

author: amyk
author_rank: Super Contributor
timestamp: October 16, 2019, 12:04:38 pm
content: Those ceramic-gold packages suggest this wasn't a cheap item. I can't read the part numbers, that would help greatly with identification.

author: Gyro
author_rank: Super Contributor
timestamp: October 16, 2019, 02:01:03 pm
content: Yes, I'd say multi-rail PSU too.That is the most rigid looking wiring loom I've ever seen - it seems to incorporate mains an low voltage wiring. Maybe it was wired point to point and then the excess bundled up into the fat part of the loom.Nice looking transformer and cute heatsinks. I wonder if those ICs are to uA723 type clones.

author: soldar
author_rank: Super Contributor
timestamp: October 16, 2019, 04:25:31 pm
content: Quote from: tkamiya on October 16, 2019, 04:29:54 amThe combination of ICs with string-tied harnesses is ... interesting.

author: soldar
author_rank: Super Contributor
timestamp: October 16, 2019, 06:09:08 pm
content: I am pretty sure it is a power block.

author: james_s
author_rank: Super Contributor
timestamp: October 16, 2019, 06:35:16 pm
content: Quote from: soldar on October 16, 2019, 04:25:31 pmSoviet electronics had a lot of idiosyncrasies like that. It's a weird mix of cutting edge and the past. They made Nixie tubes right up to the collapse as far as I know.

author: Bud
author_rank: Super Contributor
timestamp: October 16, 2019, 07:05:43 pm
content: Whatever it is, you will need to replace the electrolythics. See if that is worth the trouble.

author: DannyTheGhost
author_rank: Contributor
timestamp: October 17, 2019, 02:24:34 pm
content: Okay, let's say I saw this board already somewhere... right, in my "old stuff" box in my officeIt is linear power supply.It outputs +5V, -5V and 12V.Dont know about its current capabilities, but transformer is rated for ~60W.black ICs - discrete logic chips that gives button switch "EN" function and some basic control like short-circuit protection.Those hybrid goldy ICs - according to its part number - linear regulator with regulated output rated for 150mAIf you want any more description about this board - you will have to wait till Monday, when I will be able to get to it

author: wraper
author_rank: Unknown
timestamp: October 17, 2019, 02:28:44 pm
content: Quote from: soldar on October 16, 2019, 04:25:31 pmWas standard thing in USSR. Zip ties were rare.

author: wraper
author_rank: Unknown
timestamp: October 17, 2019, 02:33:56 pm
content: Ceramic ICs look like 142ЕН1, 142ЕН2 VREGs.https://eandc.ru/pdf/mikroskhema/142en1_142en2.pdf