[2721] AKM factory fire

Date: October 31st, 2020 | Comments : none | Categories: DIY.

The semiconductor maker Asahi Kasei Microsystems (AKM) had a massive fire at its factory that essentially wiped it out.

How does this impact fx pedals? AKM audio codec chips are widely used in high-end digital effects pedals. The AK4556 is one such chip.




[2719] The Underdrive

Date: October 30th, 2020 | Comments : [3] | Categories: DIY.

I never knew this was a thing until I saw a forum post about it this week. Apparently it is the anti-boost, which means that the output can only be attenuated. Sounds easy enough… a potentiometer and switch in a box will do the job but can lead to loading problems and tone loss, so I quickly designed this circuit:



[2716] CMOS Cookbook

Date: October 26th, 2020 | Comments : [1] | Categories: DIY.

I have a paper copy of the 1st edition of the CMOS Cookbook that I used so often that the pages started to come loose from the binding. It is an essential resource for anyone who wants to work with CMOS chips.

The author, Don Lancaster, has made the 4th edition of CMOS Cookbook available for free download from his site. Get it immediately. Thanks Don!



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