Variable Band Pass Filter Idea, using Salvaged Air Dielectric Capacitors?

Testing capacitors today… Below I explain why.

I have procrastinated serious filter experiments for too long. Today, after a quick review of some basic concepts, I began to speculate about a variable filter module.

Defining the outer edges of a Band Pass filter makes enough sense – and leads me to the idea of a potentially chaotic (in a good way) variable array of components. What if I could, manually or otherwise, shift my upper and lower limits?

Plus, haven’t I been looking for an excuse for ages to use these salvaged variable capacitors? The answer is yes.

Thus, the time has come to get systematic about it. Today, I took measurements of the capacitance of several old pieces. It looks like I have everything I need to build an interesting audio filter experiment box.

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