[sdiy] ALFA clone chips?

[cheater cheater]

What article is that from?

On Sun, Mar 28, 2021 at 7:18 PM John Staapel <j.staapel at gmail.com> wrote:
>
> About TZ
> Curtis suggest it to do TZ with a 3345, jurgen haible did the same with a 3340.  Probably SSI VCO  TZ works the same.
> Curtis write in this article
> The one major problem we have observed is internal beatings of the output as heard and seen on an
> osciIloscope . Theoretically, if the carrier frequency is an even multiple of the modulating frequency, then
> the new sidebands created will be harmonic. However, we observed that as we  increased the modulation
> depth, these beatings would begin to occur, especially after we passed through zero, Lndicating that the
> sidebands being produced were becoming non-harmonic .
> As the depth was increased further, the sound would go through alternate states of beating very rapidly and
> not beating at all. The trimmer with A1, whose purpose is to trim the absolute value circuit, did not seem to help. Any
> suggestions from our readers would be very much appreciated.
>
> Op zo 28 mrt. 2021 om 18:39 schreef Schwarz Raphael <raphschwarz at gmail.com>:
>>
>> Hi
>>
>> There is Jürgen Haible implementation of TZFM on the 3340 but it seems it does not work very well.
>> It's somewhere in the archive you have to dig it up a bit.
>>
>> Le dim. 28 mars 2021 à 15:05, Mattias Rickardsson <mr at analogue.org> a écrit :
>>>>>
>>>>> What's a TZ 3340?
>>>>
>>>>
>>>> Through-Zero.
>>>
>>>
>>> ... which is a feature of the new SSI2130 VCO, if anyone would need it in a dedicated VCO IC design. :-)
>>>
>>> It feels like the CEM3340 "reverse sync" is designed to help the implementation of TZFM, but I can't recall seeing it described. Perhaps it was one of those functions not ending up perfect enough?
>>>
>>> /mr
>>>
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