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since March 17, 2008

Legal Limit - Solid State Amp Photos

Each "Pallet" has 4 MRF-150 FETs, takes 6 watts drive, and produces 600 watts output

This amp will mount two pallets on each copper heat spreader. There will be a total of four pallets. 

Click on photos to enlarge in separate window.

Pallet, ready to have FETs mounted                                                                                      Another view of pallet

Pallets are 3  5/8 X 5  1/8 - Copper heat spreader is 9 X 5 X 3/8 - note 1/2 inch channels along edges and center to allow mounting to aluminum heat sink. There are 24 holes drilled and tapped for 4-40 screws to hold FETs and boards.

View from output end                                                                                                                Bolting FETs to the spreader w/ 4-40 screws

Close-up of thermistors, crimped &  soldered  inside ring terminals                    Thermistor mounted to FET.  Red wire connects to lead for BIAS tracking

Four FETs in place, ready to be soldered to board.                                                               Closer view - holes in channels are counter-sunk,

FETs must be mounted to heat spreader first, then                                                               to allow for 10-32 socket head  cap screws to mount

soldered, to prevent damage to FETs                                                                                        copper heat  spreader to aluminum heat sink

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