A mechanical resonator for a thermoacoustic device having a compressible fluid contained within a housing, the housing having a pair of heat exchangers and a thermodynamic medium therebetween. The coil apparatus further includes a support apparatus arranged in the recess and connected to the coil trace for mechanically supporting the coil trace. The second transistor is coupled between a first supply voltage and the output terminal and controlled by a second bias voltage. The panel is clamped between the fingers and the base upon installation of the attachment assembly.