55W (Originally 75W) Power Amplifier


Posted on Feb 6, 2014    10469

To order boards, click to go to the ESP Purchase form. Verify the price and postage, then open the order form, fill it in and print it from your browser. Boards are sold only as a stereo pair, and are supplied with component overlay, circuit diagram, bill of materials and assembly and test instructions. These instructions are as an HTML file on fl


55W (Originally 75W) Power Amplifier
Click here to download the full size of the above Circuit.

oppy disk. Complete kits for this amplifier are available now from the Printed Electronics web site. For those who do not want to have to scrounge all the component suppliers to get the parts, this is definitely the way to go. Details and all pricing are available from Printed Electronics as these may change over time I shall not reproduce them here. According to the latest information on the Printed Electronics web site, the amp has been downgraded  to 55W, which is still more than enough power for all but the most inefficient loudspeakers. The maximum recommended supply voltage is +/-35V, and it is recommended that this is not exceeded (the amp was previously stated to use a +/-42V supply voltage). The drawings below have been duly amended to reflect this change. It was developed to overcome most of the sonic problems of transistor amplifiers, and incorporates some highly innovative thinking from an experienced designer. It delivers stunning resolution and a pure, sweet sound at very low cost. Both channels are assembled on their own individual 86mm x 75mm boards and mounted on a single 300 x 75 mm ledged heatsink. It is powered from a 35 volt positive and negative supply, and runs very efficiently in Class AB. Features of this amplifier are its lack of intermodulation and depth of stereo image, unusual for a solid state amplifier. To achieve the best performance, a dual mono power supply is required a schematic is...




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