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Bear in mind that magazine designs are frequently inaccurate or incomplete. The [[Practical Electronics Analogue Sequencer]], for instance, published in April 1977, will not function correctly without the modifications published in September 1977.<ref name="sos"/>
===Schematics===▼
The Moog Modular manual is huge and contains all the schematic diagrams and some of the setup and calibration notes, but beware. Although the designs are all there, some of them use parts which may be hard or impossible to get hold of. It also has to be said that some modules, such as the [[oscillator]]s and [[envelope generator]]s, were better implemented in later designs such as the second-series [[Minimoog]], [[Prodigy]] and Rogue. Schematics for the latter two are extremely readable, as are the associated setup notes, and the circuits work.<ref name="sos"/> Another synth from the past which makes a good construction project is the [[Oberheim SEM]] (Synthesizer Expansion Module). This synth isn't too difficult to construct, and features a [[voltage-controlled state-variable filter]].<ref name="sos"/>▼
Using circuits from a former commercial product, using a schematic from a service manual can also be problematic, as these too can contain errors.
The best answer to all this, is to use circuits tried and tested by previous SDIYers. Refer to the list of external links below for where to research for these.
▲===Schematics===
▲The Moog Modular manual is huge and contains all the schematic diagrams and some of the setup and calibration notes, but beware. Although the designs are all there, some of them use parts which may be hard or impossible to get hold of. It also has to be said that some modules, such as the [[oscillator]]s and [[envelope generator]]s, were better implemented in later designs such as the second-series [[Minimoog]], [[Prodigy]] and Rogue. Schematics for the latter two are extremely readable, as are the associated setup notes, and the circuits work.<ref name="sos"/> Another synth from the past which makes a good construction project is the [[Oberheim SEM]] (Synthesizer Expansion Module). This synth isn't too difficult to construct, and features a [[voltage-controlled state-variable filter]].<ref name="sos"/>
===Books===
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