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This is a fun project for a desktop computer sound system. It uses a 2-input, 6-output DSP board for active crossovers, EQ, BSC, and bass enhancement. It's stereo analog input with stereo 3-way output, but I'll be using it as an active 2.1 system, with woofer and tweeter channels for left and right small speakers on the desktop and a sub box with dual subs under the desk.
All of the DSP functions are controlled from a cell phone using a Bluetooth link. I've got a new version of the cell phone app written with Android Studio, and it isn't complete, but it is moving along. The old app written with MIT App Inventor still works, though.
The DSP board is on the left, with a Bluetooth board plugged in. There is also a socket for using a WiFi board for control instead of the Bluetooth.
The back of the amp is simple enough: two 4-pole Speakon connectors for left and right woofer/tweeters, and another Speakon connector for the two sub drivers.
The chassis is from a prototype Virtue Audio Sensation amp--it's a nice chassis that I couldn't bear to toss. I didn't take a picture of the top, but it is a nice veneer-covered MDF cover that won't block the Bluetooth signal. But since the box is "sealed, I needed to use heat pipes to draw the heat from the amp heatsinks. The heat pipes do a good job of sinking the heat to the back and side panels..
The three main components are all items that I wish PE would stock. First, the power supply is a Meanwell UHP-200, which is much smaller than the "standard" Meanwell 24V 200W supplies. The small form factor of this series is much better suited to making compact power amps, and it would be nice to have them available at PE. Second, the 6-channel amp is one of those $25 "5.1" amps that are advertised as 4x50W + 2*100W. PE sells the Sure 6-channel amp with the TDA7492 chips, but these amp boards are smaller and use the TPA3118 chips with good quality film caps in the output filters. It would be nice to see this product along with the Sure board available at PE. And third, that DSP board with cell phone control is pretty cool and would make a nice product. I need to talk with PE about this...
All of the DSP functions are controlled from a cell phone using a Bluetooth link. I've got a new version of the cell phone app written with Android Studio, and it isn't complete, but it is moving along. The old app written with MIT App Inventor still works, though.
The DSP board is on the left, with a Bluetooth board plugged in. There is also a socket for using a WiFi board for control instead of the Bluetooth.
The back of the amp is simple enough: two 4-pole Speakon connectors for left and right woofer/tweeters, and another Speakon connector for the two sub drivers.
The chassis is from a prototype Virtue Audio Sensation amp--it's a nice chassis that I couldn't bear to toss. I didn't take a picture of the top, but it is a nice veneer-covered MDF cover that won't block the Bluetooth signal. But since the box is "sealed, I needed to use heat pipes to draw the heat from the amp heatsinks. The heat pipes do a good job of sinking the heat to the back and side panels..
The three main components are all items that I wish PE would stock. First, the power supply is a Meanwell UHP-200, which is much smaller than the "standard" Meanwell 24V 200W supplies. The small form factor of this series is much better suited to making compact power amps, and it would be nice to have them available at PE. Second, the 6-channel amp is one of those $25 "5.1" amps that are advertised as 4x50W + 2*100W. PE sells the Sure 6-channel amp with the TDA7492 chips, but these amp boards are smaller and use the TPA3118 chips with good quality film caps in the output filters. It would be nice to see this product along with the Sure board available at PE. And third, that DSP board with cell phone control is pretty cool and would make a nice product. I need to talk with PE about this...
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