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Here's my version of the Sure IRS2092 amp, available on PE for $58.00. With no signal input, it is absolutely quiet, without any hum, hiss or buzz. The amp sounds very clean, with good bass and no sibilance in the high end. For testing, I used a variety of well recorded sources such as flac music, and CDs through a Marantz CD player and an Emotiva XD-2 DAC/preamp. As far as power is concerned, I can crank it up as loud as I want to without any sign of strain or clipping, as both my Sonarias and Renditions are 4ohm speakers.
The case is from Par-Metal ($87) and measures 16X16X5. The toroid is an Antek ($80) with 600VA, dual secondaries of 40V. The soft start ($20) and speaker protection modules ($12) are both eBay items. Powering up is smooth and drama free due to the soft start.
The power supply is scratch built, modeled after the TI Application paper on PSU design. I used 25A/600V bridge rectifiers, one for each channel. The caps are each 8,200uF/100V, so each channel is supplied by 32,800uF, or 65,600uF for both channels. Bleeders are 1.8KOhms/5W, and take the power supply from 56VDC to zero in about 40 seconds.
I also added a regulated 12V DC power supply for the fan and front panel LED, using a 1A bridge rectifier and a LM7812 voltage regulator. For my next build, I will probably incorporate this onto the PSU to make things neater.
The total cost, less than $300, the satisfaction, priceless. Overall, great learning experience because almost everything was new to me. The members of this forum were so helpful when I needed the assistance, so thanks everyone.
Hong
The case is from Par-Metal ($87) and measures 16X16X5. The toroid is an Antek ($80) with 600VA, dual secondaries of 40V. The soft start ($20) and speaker protection modules ($12) are both eBay items. Powering up is smooth and drama free due to the soft start.
The power supply is scratch built, modeled after the TI Application paper on PSU design. I used 25A/600V bridge rectifiers, one for each channel. The caps are each 8,200uF/100V, so each channel is supplied by 32,800uF, or 65,600uF for both channels. Bleeders are 1.8KOhms/5W, and take the power supply from 56VDC to zero in about 40 seconds.
I also added a regulated 12V DC power supply for the fan and front panel LED, using a 1A bridge rectifier and a LM7812 voltage regulator. For my next build, I will probably incorporate this onto the PSU to make things neater.
The total cost, less than $300, the satisfaction, priceless. Overall, great learning experience because almost everything was new to me. The members of this forum were so helpful when I needed the assistance, so thanks everyone.
Hong
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