Author Topic: Yet another sad512d substitue question  (Read 5934 times)

the dude

Yet another sad512d substitue question
« on: May 21, 2009, 03:06:11 AM »
I have a old dod 670 with a dead sad512d (8-pin). I've recently aquired a sad512 16-pin ic. The 16-pin sad512 is a single bbd. I've looked at both the datasheets and I'm unsure if I could wire the 16-pin sad to work with the 8 pin. Has anyone tried this with any amount of luck? or should I just keep on hunting down a 8-pin sad512d?

Mark Hammer

Re: Yet another sad512d substitue question
« Reply #1 on: May 21, 2009, 10:44:42 AM »
They're different.  The 16-pin 512 is simply an SAD-1024 with one half working; a bit like the old days of diskettes when there were double-sided and single-sided disks, and single-sided simply meant that only one side was guaranteed to work.  The 8-pin SAD512D is different in that it includes on-board circuitry to take a single-phase clock input (tick-tick-tick) and convert it to dual-phase (tick-tock-tick-tock).  Since it is based on a 512D, the 670 board will lack the requisite flip-flop circuit to provide those two complementary clock pulses.  You CAN provide that conversion yourself, but at this point, we're starting to move well past a mere chip replacement.

oldschoolanalog

Mystery lounge. No tables, chairs or waiters here. In fact, we're all quite alone.

Mark Hammer

Re: Yet another sad512d substitue question
« Reply #3 on: May 21, 2009, 04:59:03 PM »
I went straight to the Smallbear stocklist when the OP came up, but found no mention of any reticon chips anymore. :icon_sad:

oldschoolanalog

Re: Yet another sad512d substitue question
« Reply #4 on: May 21, 2009, 08:27:52 PM »
I went straight to the Smallbear stocklist when the OP came up, but found no mention of any reticon chips anymore. :icon_sad:
"Hen's teeth" status. Ugh.
Guess it's time to break out the 4013's & SAD512's or TDA1022's...
« Last Edit: May 21, 2009, 08:31:20 PM by oldschoolanalog »
Mystery lounge. No tables, chairs or waiters here. In fact, we're all quite alone.

aziltz

Re: Yet another sad512d substitue question
« Reply #5 on: May 21, 2009, 09:22:12 PM »
I went straight to the Smallbear stocklist when the OP came up, but found no mention of any reticon chips anymore. :icon_sad:
"Hen's teeth" status. Ugh.
Guess it's time to break out the 4013's & SAD512's or TDA1022's...

hens have teeth?  ???

mdh

Re: Yet another sad512d substitue question
« Reply #6 on: May 21, 2009, 09:45:04 PM »
At least we can mourn the loss while recalling this subtly humorous gem from the SAD512D data sheet: "Use grounded soldering irons, tools, and personnel when handling devices."  This is audio electronics, we ain't got no "grounded personnel!"

oldschoolanalog

Re: Yet another sad512d substitue question
« Reply #7 on: May 22, 2009, 01:02:55 AM »
Quote
hens have teeth?  ???
About as many as there are SAD512D's readily available & cheap... :D
This is audio electronics, we ain't got no "grounded personnel!"
:icon_lol: :icon_lol: :icon_lol:
And we don't need no stinkin' badges either!

Mystery lounge. No tables, chairs or waiters here. In fact, we're all quite alone.

Rylan

Re: Yet another sad512d substitue question
« Reply #8 on: December 02, 2013, 05:10:48 PM »
Sorry to zombify this once dead thread, but I just put in an RFQ on 20 sad512d's so if you are all still looking for them I should have a few extras soon. I'll put em up on ebay once I get em.