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In a previous post, I showed how to use an SPDT switch to select between multiple memory chips on the Spin FV-1 to expand the number of patches available. In this post, I will show how to use a single DPDT switch to allow access to two memory chips plus the internal sounds that are built into the FV-1.
The extra set of poles on the switch allows the internal patches to be enabled when needed or disabled when the external memory chips are active. The switch needs to be a center-off DPDT, which is commonly available.
The middle pin of the left set of switch poles has a pull-down resistor and is connected to pin 13 of the FV-1. There are no other resistors or connections to pin 13. When the switch is in the middle position, the new resistor pulls pin 13 to ground to enable the internal sounds, and the other set of poles has disabled both external memories.
When the DPDT is toggled to either end position, pin 13 is made HIGH and the external memory chips are enabled as in the previous article.
This alternate bank switching method allows access to internal and external sounds with a single switch.
The Booster 2.5 was one of my early amp-in-a-box designs from about 1999. It has been used on numerous commercial pedal designs and as a starting point for the BSIAB and other similar designs.
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:
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!
