Will this be adequate at least initially, or would it be wise to snag a few 10,000uF monsters to add to the power filtration? Assuming I can get a decent enough thermal contact for each IC, does this heat sink sound like it will have enough mass to support two TDA7293s? (Yeah, I know there's a lot of thermodynamics data that would be needed to get an accurate reading on whether/how well this 'sink will work, but all I can give are raw measurements.)įor the smoothing circuit, I'm using quad 1200uF capacitors (low-ESR caps designed for power-supply filter applications) per board, in addition to the dual 6,800uF caps in the supply rails. The heat sink I have, also cannibalized from a fried receiver is 11' wide, 3.25' tall, and sports 22 fins, each being 2' long.

searches seem to suggest this is the absolute upper limit for TDA7293 setup. I found an old enclosure which can accommodate the amp board, heat sink, power transformer rectifier and filter capacitorsâ€¦ the trafo is a 32-0-32 250VA. Tentative double side PCB layout, top and bottom sidesâ€¦ have to check pitch and spacing with actual components we have before fabricating the PCB. I thought it would be good to share my project with the communityâ€¦ maybe someone finds it useful. Pin out on TDA7293 is tricky, so single-sided board is difficult to draw, and in the end contains more jumpers between lines than tracksâ€¦ so, this one is made as double sided. the board layouts in the datasheet are flawed and little clumsyâ€¦ we used them only as guidance with component arrangement on our PCB after few futile attempts to route the board with minimum jumper count. Our schematic is almost the same as in datasheet. I have been looking for a source of PCBs using parallel TDA7293sâ€¦ there are not many out there that you can buy. Having built single chip amp and extensive listening TDA7293 is my favorites for IC power amp applications. This IC can run up to 100V, low distortion, and can easily be paralleled. This is when I and my friend John found the datasheet of TDA7293. I needed something as easy, but more powerful. As part of my home theater build, have decided to go for 3 way actives for front LCRâ€¦ so, need to build 9 power amps for fronts and 8 amps for surroundsâ€¦ to pair up with my Sherbourn PT-7020A pre/pro.

Tda7293 parallel circuit layout