IC identification. - Page 1
Forum section: electronics / general

author: nonsuchpro
author_rank: Contributor
timestamp: May 26, 2019, 10:53:27 pm
content: Hey all.I came across an IC I cant find any info on. Any help would be appreciated!Thanks!

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 26, 2019, 11:22:45 pm
content: Looks old, I'd start by betting the 7808 is the date code.Where did you get it from, and what's on the bottom of the chip?I don't have a clue BTW, just trying to investigate.

author: nonsuchpro
author_rank: Contributor
timestamp: May 26, 2019, 11:31:59 pm
content: It came out of a Lowery Organ. The bottom has "18" molded in the middle.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 27, 2019, 02:03:48 am
content: So 1978 sounds about right? Hard to tell, but I'd guess these organs are filled with custom logic DIPs dedicated to being an organ, and a boatload of discrete analog stuff.An 8 pin DIP could very well be an opamp like a LM301 or LM741, can you measure stuff on the board?

author: amyk
author_rank: Super Contributor
timestamp: May 27, 2019, 02:24:31 am
content: What model of organ? Have you looked at the service manual?

author: wraper
author_rank: Unknown
timestamp: May 27, 2019, 02:31:58 am
content: Do you really have to know what this chip is? If it's just out of curiosity, I would not bother.

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 04:46:35 am
content: Quote from: amyk on May 27, 2019, 02:24:31 amIt's a Lowery Promenade. 1976.

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 04:48:03 am
content: Quote from: wraper on May 27, 2019, 02:31:58 amI would like to know what every IC in it is. It could be a synth chip I can use in future projects.

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 04:53:28 am
content: Here's all the boards.

author: wraper
author_rank: Unknown
timestamp: May 27, 2019, 05:01:23 am
content: Quote from: nonsuchpro on May 27, 2019, 04:48:03 amI'm 99% sure that 99,9% of the chips you identify in the end will go into trash can. Be it you or your descendants cleaning results of your hoarding.

author: amyk
author_rank: Super Contributor
timestamp: May 27, 2019, 12:08:29 pm
content: Like many other companies, it seems they used custom part numbering.It's an MC1458C.You can find that and the rest of the cross-reference here:http://celedoniaorgan.netfirms.com/cos2/index.php?main_page=index&manufacturers_id=3&filter_id=70&sort=3d&page=27http://web.archive.org/web/20181006203146/http://www.organservice.com/lowrey/991Parts.htm(site currently down)

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 06:02:45 pm
content: Quote from: wraper on May 27, 2019, 05:01:23 amThere's always one dick in the forum, isn't there?

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 06:23:06 pm
content: Quote from: amyk on May 27, 2019, 12:08:29 pmThank you so much! This will help a lot.

author: wraper
author_rank: Unknown
timestamp: May 27, 2019, 08:31:50 pm
content: Quote from: nonsuchpro on May 27, 2019, 06:02:45 pmPeople don't like hearing the truth. It's just a common experience, including my own. You may see a big value in them now but hardly any of that will be realized. It's just much more productive just buying a few parts you need rather than having heaps of salvaged stuff. Most of which you likely even won't remember having after a year. It basically drags you down trying to use heaps of old crap that you have instead of just selecting what's most appropriate.

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 08:48:26 pm
content: Quote from: wraper on May 27, 2019, 08:31:50 pmHow about you worry about your own reality instead of putting others down.

author: wraper
author_rank: Unknown
timestamp: May 27, 2019, 09:41:07 pm
content: If you have nothing better to do than identifying every old junk you find, I'll stay aside.

author: nonsuchpro
author_rank: Contributor
timestamp: May 27, 2019, 11:39:46 pm
content: Quote from: wraper on May 27, 2019, 09:41:07 pmAs you should have to begin with. You're just a troll who thinks he's cool with 9000 posts who has nothing to add. How about you go be productive and build something. You're the reason I hate the toxic nature of forums.

author: wraper
author_rank: Unknown
timestamp: May 27, 2019, 11:48:42 pm
content: Quote from: nonsuchpro on May 27, 2019, 11:39:46 pmSays someone who replies with personal attacks simply because of opinion he does not like.

author: nonsuchpro
author_rank: Contributor
timestamp: May 28, 2019, 12:31:54 am
content: Quote from: wraper on May 27, 2019, 11:48:42 pmCalling me a "hoarder" was your personal attack. You didn't know what the IC was so all you could do was make a personal attack.

author: digsys
author_rank: Unknown
timestamp: May 28, 2019, 01:19:57 am
content: Quote from: nonsuchproBest to just leave one non-provactive reply and cut them loose :-) or just end with ymmv :-) Fortunately the forums aremostlycivil !I collected "older" pcbs for many years, had several large boxes of them. Mainly to see how "others" created stuff and the techniques they used.Learned a lot. Gave it all away recently to another who was sort of starting out. Growing up with "ratting old boards / parts" never leaves you.Hope you find some interesting stuff.

author: wraper
author_rank: Unknown
timestamp: May 28, 2019, 01:28:11 am
content: Quote from: nonsuchpro on May 28, 2019, 12:31:54 amI didn't call you so. I said "results of hoarding" which your picture exactly represents (light hoarding). And I said it with a meaning that spending a lot of your time on it (such as deciphering obscure parts) does not do you any good because eventually barely anything of it will be of any use anyway. I don't consider it an attack and I'm hoarded a lot of stuff then got rid of a lot of it but it keeps accumulating again. BTW hoarding stuff is very common among electronics guys. You called me a dick and troll, whatever.

author: Shock
author_rank: Super Contributor
timestamp: May 28, 2019, 02:24:37 am
content: During domestic disputes I find it's always important to focus on the children.Hmmm maybe not...

author: nonsuchpro
author_rank: Contributor
timestamp: May 28, 2019, 02:47:52 am
content: All I'm saying is... if you wan't post counts, go to 4Chan. This is a legit forum that deserves real answers to legit questions, not asshole replies. If you don't know the answer to my question, just shut your mouth.

author: nonsuchpro
author_rank: Contributor
timestamp: May 28, 2019, 03:09:37 am
content: Thank you for those who were willing to help me.