Apr 16, 2009

Attenuation Modules

Tonight was spent working on the built-in Speaker Attenuation circuitry. Not pictured is a 3 position 4 pole rotary switch. I only needed to use three of the available 4 poles. Here's a diagram that explains how the circuit works. The Switch will have 3 positions. Quiet, Normal/Loud, and Medium. I'm pointed out where I tap into the circuit for my 3 poles.



Here's a diagram that shows how the switch works. It has 3 possible positions. There are 4 wipers that connect the various points together. The Poles are in the center.

I added some stand-offs on the amp. The Amp will have interchangeable Attenuation Modules.
This way any number of power output combinations will be possible.

The Attenuation Modules will have these Power Outputs. This way for example you can configure the amp to have 18.0 watts for large venues, 2.3 watts for practice sessions, and 0.3 watts while playing at home. Later if you decide 0.3 watts is still too loud you can remove that module and replace it with a 0.1 watt module.
  • 18.0 watts
  • 9.0 watts
  • 4.5 watts
  • 2.3 watts
  • 1.1 watts
  • 0.6 watts
  • 0.3 watts
  • 0.2 watts
  • 0.1 watts

The Quiet Module attach to the three left most terminals. The Medium Module will attach to the three right most terminals. I plan on building the modules tomorrow.




















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