[sdiy] ALFA clone chips?

[Tom Wiltshire]

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> 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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> 
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