BUILDING THE MJR7-Mk5. PHOTOS
The photos are of the first experimental MJR7-Mk5, which was built on a MJR9 board, so the final board is a little different. Apart from the unused holes for the feedforward components the anti-thump circuit was not included. Otherwise the layout is almost identical. The first photo has just the resistors, terminal blocks and fuse.
Next the capacitors and inductors are added:
Next the on-board transistors and diodes are added:
Some of the component leads need to be bent outwards to jump over tracks, these are shown in the next photo. Then the 12V zener diodes used to protect the mosfets are shown. These are joined together to save space on the board. The photo shows the cathodes soldered together.
This is the board mounted on a metal bracket for testing:
