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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"/>
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===
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