[2731] FV-1 Bank Switching Again

Date: January 11th, 2021 | Comments : [2] | Categories: DIY.

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.


2 Responses to “FV-1 Bank Switching Again”

[787309] admin Says: 8:56 am, February 1st, 2021

Just to clarify something… there is no pull-up resistor on pin 13. If you are converting a design that previously had a pull-up resistor connected to pin 13, then it must be removed. There is only a pull-down resistor as specified in paragraph 3 of the article above.

Best regards, Jack

[787310] admin Says: 8:53 am, February 3rd, 2021

This design has been verified to work properly with the FV-1

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