Erica Synths selling reissues of 3109 and 3080 analog parts

[Digital Larry]

https://www.ericasynths.lv/news/as3109-as3080-now-available/?fbclid=IwAR1b1diGCHQMv_SjMgX5o09Zpm6K-VsMNnMxYtQdK_qBKQ2Eu-8W4-ZVEsc

[Mark Hammer]

The 3109 chip is also used in the Boss PH-2 Super Phaser and the big brother RPH-10 unit.  Though oft-presented as a chip for filtering, it's really 4 non-dedicated OTA sections that are optimized for use as filters.  And, just like the much-coveted SSM2040, one can reconfigure it into a variety of filter forms, including allpass, for phasing.

[PRR]

...really 4 non-dedicated OTA sections...

With a common control pin. So electrically-programmable different gain/EQ among the four sections (4-ch mixer) is not possible.

Still a fantastic repackaging of the '3080.

[StephenGiles]

CA 3094 ?

[amz-fx]

Also sold at Synthcube:

https://synthcube.com/cart/alfa-rpar-en

The Alfa AS3080E is different from the CA3080 in that it has linearizing diodes connected to pin1, similar in function to the diodes in the LM13700. If you don't connect pin1, it should be a drop-in for the CA3080.

Datasheet: http://www.alfarzpp.lv/eng/sc/AS3080E.pdf

regards, Jack

[Jarno]

Alfa also makes a host of other reissues, mostly DIY synth related matched dual transistors, and the 3046.
Also on OTA's, a remake of the 3280, very nice.
And CEM3340 3320 3310 etc.
Pretty good.

[Kevin Mitchell]

ALFA RPAR has been doin a great job resurrecting discontinued chips. Some of the mentioned chips on this thread have produced for years now. When they first rolled out the AS3280 in DIP I bought a bunch in bulk before the price went up dramatically.

As for the CA3094, at this point it would be worth while to create a sub-board using the SMD AS3080 with an added footprint for a darling pair of transistors. That would make a viable drop-in replacement for CA3094 (or EH1048) chips.

A fun note someone had mentioned in this forum last year, the AS3080 chips are likely made from rejected wafers from their AS13704 which is their quad version of the LM13700. No reason to let them go to waste - why not resurrect an oldie! Stock of CA3080 wafers still exist in limited quantities by the way. But who has the equipment to package them? 

For the synth chips there's some debate going around about whether it's right or wrong to support the knockoffs of the ONCHIP products - like the CEM3340. The Curtis family has posted some articles calling out mostly Behringer on this. But considering how they only offer CEM3340 REVG and the CEM3320, I really don't see their mojo monopoly worth redialing my moral compass at my financial expense.

BTW, Alfa RPAR is very responsive to the DIY music electronics community which IMO is great support & appeal.

[Kevin Mitchell]

Random note kind of related to ALFA, I came across a short video over the weekend with someone talking about white ceramic chips with gold leads. It was nonsense really, no info to take from it but what I noticed was it was a one of their dev chips of the AS3310! Those aren't suppose to go to customers, so how did that kid on youtube get one? AND HOW CAN I GET ONE
I want a gold plated proto-chip 

[ElectricDruid]

The AS3080E has been out for a while. I mentioned it when I first heard about it in Aug 2020:

https://www.diystompboxes.com/smfforum/index.php?topic=125268

The AS3109 is an interesting choice. While I do fancy a SH101 filter, I'd have preferred DIP, and I sort-of wish they'd added a resonance VCA (since the SOIC package isn't drop-in compatible with the original anyway).

Alfa are doing some great stuff though. This is a fabulous time to be building analogue synths.

[bluebunny]

[aside]
Dougal disappeared!!   
[/aside]