[sdiy] Elektor Formant synth build

[Terje Winther]

> Are you referring to the FET followers selections here?

Yes, among other things.

> They can be prevented by using the LF356 instead, as a high  
> impedance follower, as described in book 2. I did that.  
> Unfortunately LF356 itself is now obsolete I think, but you'll find  
> another I'm sure. I used the metal can LF356, which can easily be  
> bent to replace the  FET follower on the existing PCB.

Indeed! The PCB and front panel set I got came with some original NOS  
parts, so I used them where I could, meaning I had to do the necessary  
work to make them function properly. In other places I had to  
substitute newer parts, and the upgrades described in book 2 was  
really useful in that regard.

> As said by others, first find the parts you need, only then build  
> it. But a more modern design may be preferrable.

I think so too.


Terje


>> On 08 Nov 2015, at 17:06, Terje Winther <terje.winther at wintherstormer.no 
>> > wrote:
>>
>> As for building: for me it was much more work than modern modular  
>> DIY synths, because you need to select parts in a much more  
>> specific way then on modern modulars. For several of the modules I  
>> needed to build small test-circuits on veroboard so I could select  
>> correct transistors, diodes and ICs, and for some of the modules it  
>> is a fairly specific way of adjusting the trimmers or even finding  
>> the correct value of a resistor, involving desoldering parts,  
>> shorting out components and connections and the like. Quite doable,  
>> of course, and everything is very well explained in the book, so  
>> even though it is a little more work than on contemporary DIY  
>> modulars (which are easier to build and works pretty much straight  
>> away), it is mostly fairly easy to build these modules.

Terje Winther
terje.winther at wintherstormer.no
http://wintherstormer.no/





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