|20th November 2019, 09:42 AM||#21|
Join Date: May 2018
The major problem is lack of space. This modified amplifier is the perfect example of a product designed to be modification-repair hostile to the fullest sense of the phrase. There is NO space for fuse carriers, let alone a separate protection circuit!
To create some space, I have to literally make two small PCBs to mount on the main heatsinks. However, these require thick connecting wires to and from the rails. Meddling with high oscillating currents at rail voltages is asking for more interference issues.
There is a very drastic 'solution' to all this, but this, requires an overhaul of how the circuitry is mounted. This is by redesigning a PCB to hold every component and using a thick (12mm) aluminium bar to conduct heat away from the output transistors to the heatsink. In such an arrangement, the output stage transistors would be mounted in the middle of a long PCB. I have seen amplifier PCBs like that by Yamaha, but the large output pairs are mounted on the outer edges of the PCB along its longest sides.
Some years ago, someone wrote that workarounds are often ugly. I must write, in this case, he was right!
The original amplifier by Wharfedale (S1500), had only one fuse per amplifier module connected at 0V, instead of at the positive and negative rails. This means, in the event of a fault, the fuse would be blown but the amplifier output stage would still have the full rail voltages.
Thanks for helping me design my first amplifier.
Last edited by edbarx; 20th November 2019 at 09:54 AM.
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