[sdiy] SG3821 Transistor array

[thx1138]

On 9/10/09 3:09 PM, "rob" <rob at emulatorarchive.com> wrote:

> Hi
> Use the 3086 - this is what E-mu Systems did in the Mark 2 UAT
> Dave Rossum also modified the CV control circuit at the same time
> 
> Regards
> Rob
> 
> thx1138 wrote:
>> Hi SDIY folks.
>> 
>> I am rebuilding the Universal Active Filter Module designed back in 1973.
>> 
>> I am looking for a Data Sheet on the SG3821 Transistor array.
>> 
>> It has been a long time singe I used this part and if anyone has a better
>> replacement suggestion I would be interested in your comments.
>> 
>> I was looking at the CA3046 and CA3086 devices and these type of parts.
>> 
>> We used them at Oberheim for the SEM1-A for Osc. 1 & 2 designs.
>> 
>> I just have not been able to get a data sheet on the SG3821. It would be
>> nice to keep the same part in the design but I am afraid it may be hard to
>> find these days.
>> 
>> Regards,
>> 
>> Terry
>> 
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>> 
>> 
>> 
>>   
> 
> 
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Hi Rob,

I pretty much answered my own question after I sent it.

It appears that many good discrete devices are becoming scarce.

I have a pretty good inventory of SSM chips left over from my own designs
after leaving E-Mu and PPG back inb the mid 1980's.

However, I am rebuilding several of my  modules to use more current devices
and I do not want to depend on SSM chips for any of my designs.

I have a pretty complete set of modules in a pair of cabinets including a
4065 keyboard with expanded memory and disk drive.

I bought the last E-Mu Poly keyboard while working at E-Mu and Dave Rossum's
brother John Rossum made me a case for it as well.

Everything works and I hope to be able to add onto this with a series of new
modules. Worst part is finding ALCO knobs and Bourns pots in stock anywhere.

I just bought about a 1000 knobs from an obscure source in Tokyo and they
look identical to my ALCO knobs.

Bourns is quoting me 12 weeks for pots and 500 piece minimum run. So it
looks like I am getting some of the more difficult pieces out of the way.

My panels and PCB's are NOT going the ELCO pin route. That was the worst
mechanical design for transporting a unit in a flight case.

My Modules are based upon my designs and lessons learned while working with
Dave on the previous designs.

BTW, I like your web page and it makes me a bit nostalgic for the old days.

If you wish to correspond with me, please do.

Regards,

Terry