SAD1024 (not redundant- I read all the other threads...)

[Gregory Kollins]

Ok, I've read just about every thread on here and three to four other forums on this chip, along with other assorted articles, and I have a question. It seems idiotic to me that no one would ask it so far, so, here goes:

Electro-Harmonix cannot possibly still use this chip in the electric mistress. So... what do they use? Now, not in the 70's? Today. Right now. The new ones, manufactured now. For sale at Guitar Center.

If someone says they still use this chip, I won't believe you. They don't. They can't.

Now, I don't want to discuss what's good about the sad1024, what to substitute, mods etc. There is ENOUGH on that. I just want to know, what does EH use?

[Thomeeque]

RD5106A (at least around 2002 )

[theehman]

I think they're using some MN series delay IC now.

[Mark Hammer]

I do not know the specifics of the EM but there was a period when you could simply not find MN3005s because Mike Matthews had bought up the lion's share of the world-wide supply so as to be able to assure the sustainability of the memory Man.  That binge, in turn, stemmed from incidents in the early 80's, discussed here previously, where EHX was shut out of access to Matsushita chips in order to give preferential access to Japanese companies.  I gather the lesson he learned was to do what was necessary to secure access to needed inventory.

Yiou will note that the current issue Stereo EM is essentially a digital pedal.

[alex frias]

Anybody has the RD5106A datasheet? Or any info about it?

[puretube]

Anybody has the RD5106A datasheet? Or any info about it?

I did the search for you...

[StephenGiles]

Anybody has the RD5106A datasheet? Or any info about it?

RD5106A (at least around 2002 )

Interesting, the 5106 needs single phase clock only!!

[alex frias]

Thanks and sorry, I used google and certainly did a slopy search here in DIYstompboxes.

[Gregory Kollins]

Thanks for the speedy info! I'ma do more research on the reissue setup and cloning one with a RD5106A chip. I feel like this information should be compiled for the wiki or something, because the EM is a popular pedal, and SAD1024s don't exist anymore, except in Cuba. Fidel bought up a whole bunch and has them stashed right next to his large reserves of antihydrogen.

[puretube]

Maximo Lider got some RD5106A stash, also???

[stm]

Anybody has the RD5106A datasheet? Or any info about it?

I did the search for you...

There is no datasheet for the R5108 in that thread, just the datasheet for the 5106, which is said to be equivalent except for a different number of stages.

[JDoyle]

There is no datasheet for the R5108 in that thread, just the datasheet for the 5106, which is said to be equivalent except for a different number of stages.

Then there probably isn't a datasheet - it would be completely redundant and a waste of time and paper, not to mention making filing/tracking changes/archiving a major PITA - which means the 5106 datasheet IS the 5108 datasheet. The number of stages in a BBD is inconsequential if another datasheet gives you the rest of the innards - it is just x number of stages more of MOSFET/cap combos.

[stm]

There is no datasheet for the R5108 in that thread, just the datasheet for the 5106, which is said to be equivalent except for a different number of stages.

Then there probably isn't a datasheet - it would be completely redundant and a waste of time and paper, not to mention making filing/tracking changes/archiving a major PITA - which means the 5106 datasheet IS the 5108 datasheet. The number of stages in a BBD is inconsequential if another datasheet gives you the rest of the innards - it is just x number of stages more of MOSFET/cap combos.

There is/was a 5106 datasheet according to the following quote:

T-rask,
I have the R5106 data sheet here in the 1983 Reticon databook, it is 6 pages (but no scanner...)

If it were just a matter of different number of stages with the same pinout, then both models would have been be listed in the datasheet by the manufacturer, like with the SAD512 and SAD1024.  But it is not the case for the R5106 and R5108.

There can be other differences apart from the number of stages that legit the request for a manufacturer's datasheet.  For instance, consider the differences in the MN3007 v/s MN3009 datasheets:

Variable delay time of audio signal:  5.12-51.2ms  v/s  0.64-12.8ms  ***different max/min ratio
Wide dynamic range:  S/N=80dB  v/s  S/N=88dB   ***different
Wide frequency response:  fi=12kHz  V/s  fi=14kHz   ***different
Number of stages:  1024  v/s  256
Clock input capacitance:  700pF  v/s  200pF  ***not proportional to number of stages

In addition, the application circuits for the MN3007 and MN3009 are different, and notice how the clock IC (MN3101) has a series diode in the positive supply for the MN3007 circuit, but not for the MN3009 circuit.  Intriguing, to say the least.  Biasing biasing graphs are not the same either.

In summary, the question remains open: does anybody have an electronic copy of an R5106 datasheet?

[jimbeaux]

I'm away from home til' this weekend - but I do have a copy of the Reticon Databook & I'll have the RD5106A data-sheet scanned by this Sunday (2/1/09) (my memory is that there are 3 separate data-sheets for the RD510X BBD series.

I also have an old Radio-Electronics article which has a few simple circuits (clocks, etc,...) using the RD510X series which I'll be glad to share.

- Jimbeaux

[stm]

It would be very nice of you to scan the datasheet collection.

[jimbeaux]

It would be very nice of you to scan the datasheet collection.

Sure Thing !

[theehman]

I'm away from home til' this weekend - but I do have a copy of the Reticon Databook & I'll have the RD5106A data-sheet scanned by this Sunday (2/1/09) (my memory is that there are 3 separate data-sheets for the RD510X BBD series.

I also have an old Radio-Electronics article which has a few simple circuits (clocks, etc,...) using the RD510X series which I'll be glad to share.

- Jimbeaux

Already had the RD5106/RD5107 datasheet in PDF form.  Here you go:

http://www.ronsound.com/ebay/RD5107.pdf

I think this came from Mark Hammer.

[ZiggyZipgun]

You could always try Hong Kong and mainland China for the SAD1024.  Mojotone.com sells them for $30ea, but I recently bought a small stash of 22-pin ICs (not SAD1024) that go for $19 in the US, through HYC Electronics in Shenzhen for 59¢ a piece.  It did help that they offered customer service through MSN Messenger, and that the agent working at that moment was a nice 21-year-old girl that speaks good English and likes music, and it also helped that I played traditional Chinese violin once upon a time, but you know, do what you have to and charm the pants off 'em.  Their minimum order is 3000 pieces, and they sold me 26 (I like even numbers).

[stm]

Thanks, EH Man!

[Gregory Kollins]

I contacted a component middle-man type situation, the kind that just find out all kinds of stuff for you and arrange a purchase, and the cheapest he found SAD1024's was $25 a pop with a minimum order of 10. Just thought i'd add that.