[sdiy] ALFA clone chips?

[Tom Bugs]

Personally I feel this is Coolaudio muscling it - I have used their 
2164s before but prefer to support the small guys who've made the bold 
step to work on producing chips - Alfa & Sound Semiconductor.
I've still yet to really test the Alfa samples I've received but they've 
been good to deal with (I have a roll of S08 AS394 matched NPNs to use 
shortly) - SoundSemi have been really excellent & have great support & 
documentation for their small but classy range of chips.

Slight offtopic, sorry ;)

On 27/03/2021 18:34, Tom Wiltshire wrote:
> CoolAudio lowered their prices significantly is what happened, for 
> both V3340 and V3320. Alfa’s previously much lower prices might well 
> be a part of the reason why. Either way, Coolaudio's chips suddenly 
> got a lot more appealing.
>
> The 3320 has a maximum current (100uA or so) for the resonance control 
> input. As long as you put a large enough resistor in front of it for 
> the voltage you’re using, there’s no problem. It’d be nice if they 
> made this more obvious, instead of merely implying it with a 100K 
> resistor on the datasheet circuit, but that’s exactly the same as the 
> CEM3320, and as the CEM datasheet.
>
>> On 27 Mar 2021, at 15:57, Benjamin Tremblay via Synth-diy 
>> <Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>> wrote:
>>
>> And I have noticed vendors are moving away from some of the AS chips.
>> Coolaudio is eating their lunch.
>>
>>> On Mar 27, 2021, at 11:46 AM, Benjamin Tremblay <btremblay at me.com 
>>> <mailto:btremblay at me.com>> wrote:
>>>
>>> I have not tried the VCO, but have had great results with the 3320 
>>> VCF and the 3360 VCA. It’s pretty much Pro One for the masses.
>>> The 3320 is easy to damage if you over-power the resonance control.
>>> The 3360 can be tamed once you work within the correct control 
>>> voltage range.
>>> I’m an idiot. I don’t have a scope. But they sound great and I was 
>>> able to get them stood up and move on to the rest of my project.
>>>
>>> I’m also using a number of AS2164 chips. I have never used other 
>>> brands, but these work great for computer-controlled mixers of 
>>> analog signals.
>>> I made no effort to squeeze any gain out of them using negative 
>>> voltage bias on the control pins. They work fine for my application.
>>>
>>> I still have some 3330 VCA chips. They were very frustrating to use. 
>>>  They seem to require a low-impedance voltage divider that gets very 
>>> noisy without careful placement of capacitors.
>>> Maybe if I go back and try to breadboard them after having learned 
>>> the 3360 I could be more successful.
>>>
>>>> On Mar 27, 2021, at 11:19 AM, cheater cheater 
>>>> <cheater00social at gmail.com <mailto:cheater00social at gmail.com>> wrote:
>>>>
>>>> I was wondering if anyone had any experiences with ALFA clones of
>>>> classic chips. Are they good? Is anything missing? Are they very crap?
>>>> No difference at all? Any specific ones to watch out for?
>>>>
>>>> Thanks
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