[sdiy] ALFA clone chips?

cheater cheater cheater00social at gmail.com
Sun Mar 28 00:28:32 CET 2021


On Sat, Mar 27, 2021 at 10:19 PM Tom Bugs <admin at bugbrand.co.uk> wrote:
>
> 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 ;)

Definitely ontopic! Good to hear.

> 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> 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> 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> 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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