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  Believe the Hypex, class-D DIY amplifier 
  Dec 08, 2005, 07:30am EST 

Putting it together

By: Sander Sassen

When building an amplifier using these amplifier modules you’ll find yourself spending more time preparing the case and bolting everything down than connecting the modules themselves. Both the amplifier modules and the power supply kits are equipped with fast-on connectors and a bag of fast-on plugs is supplied. Hence you’ll only need to crimp these to the bare end of the cables. Connecting everything up then becomes child’s play, no soldering required. Below you’ll find a few pictures that illustrate how I managed to work two UcD400 AD amplifier modules, two HG power supplies and two 300VA torodial transformers into a 19” rack case that’s commonly used for housing do-it-yourself amplifiers and other similar projects.

Dual-mono UcD400 amplifier front

The front of the amplifier, we opted to add passive volume control for each channel.

Dual-mono UcD400 amplifier top

An overview of the amplifier, with the powersupplies on the left, amplifiers on the right.

Dual-mono UcD400 amplifier back

The back of the amplifier, we opted to use non-balanced inputs and sturdy speaker bindings posts.

Here are a few general suggestions on how to properly construct an amplifier using these modules. Care should be taken that cables carrying AC current are not mixed with cables carrying DC current, to avoid inducing hum. Furthermore, signal cables should be shielded and kept far from AC cables as well as the amplifier output cables. Naturally the high-voltage parts should be sufficiently protected against accidentally touching live parts and routed clear of any sharp corners or obstacles. The Hypex power supply kits come with fuses installed, but that doesn’t negate the need to also use a fuse at the mains, that fits the rating of the transformer(s) used. And obviously you need to go over the instruction manual a few times prior to connecting the amplifier up to the mains to make absolutely sure everything is connected properly.

1. Introduction
2. UcD, universal class-D
3. Putting it together
4. Performance figures
5. Conclusion

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