Power Amplifiers


Posted on Feb 7, 2014

Note that there is very little in the way of protection circuitry and fuses in this amplifier. There is a short turn-on delay for the output power supply to minimise thumps, and a couple of line fuses, but no other protection. This is not recommended for most applications, since any problems caused by accident or parts failure can potentially caus


Power Amplifiers
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e a huge amount of damage, up to and including complete destruction of the amplifier and any speakers that may be connected. However, the speakers that will be used with these particular amplifiers are almost indestructable, and the risk of catastrophic amplifier failure is more than compensated for with the better sound achieved by not including the extra circuitry in this case. Below is a picture of the bare printed circuit boards for the amplifer sections, as well as the bridging adapter, fully populated. These are home-made double sided pc boards created with the toner transfer method. And finally, pictures of the finished amplifier. The project has been a great success so far, with the first amplifier achieving or surpassing the original design goals. The sound is much more dynamic than the original, with sounds seeming to leap right out at you. Detailing is far superior, with a wider, deeper, very stable soundstage. And the amplifier runs much cooler, only getting a bit warm when run hard, as opposed to the original PS Audio amplifiers which required fan cooling at higher volumes. Power output is measured at 150 RMS Watts per channel into 8 ohm loads and 225 Watts into 4 ohms. This first amplifier will now be auditioned at length, with further refinements and improvements made. Eventually, the second amplifier will be constructed to match the first one, including any modifications. Updates, as always, will be added as...




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