Sunday, 17 February 2013
AMZ Super Buffer
There are situations in which very long cable runs are necessary from the pedalboard to the amplifier, or a more powerful driving circuit is needed to the heavy load presented by devices in parallel. A good buffer box is the solution.
The best buffer board will present a high impedance to the input while having a low impedance output. This insures that the maximum clear signal will pass through unchanged to the output, and a low impedance drive can send the signal through long cables without losing much strength or response.
There are numerous special purpose chips that are designed as buffers for driving very long lines and/or capacitance loads. These ICs can be difficult to find and expensive. A simple solution for stompbox purposes is to parallel opamps and thereby boost the output drive. With attention to a few details, this is a simple project to build.