TPA3116 NE5532 – Test Instruments Digital Subwoofer Power Amplifier Board

This TPA3116 NE5532 Power Amplifier has 2.1 channel productions that have 2 mid range output speakers as well as 1 output for subwoofer speaker. In the middle output or L / R output of every power has 50w; however the subwoofer has a power production of 100W at 4 Ohm impedance. 

The amp usages one chip for the “.1” sub canal and has a static, sallen-key topology 2nd order LP filter by Butterworth damping. On my panel, the LP F3 was 107 Hz. I have successfully adapted that filter by substituting 2 box poly caps. In the diagram, you can see a table of likely F3s given normal value capacitors. I added a legend toward the amp’s image to cross reference with the schematic.

The amp has an auditory frequency bandpass filter, oddly, only on the sub channel. Inappropriately, the F3 of the 1st order HP section is fixed at ~34Hz limiting low frequency. This is easily resolved by substituting two 1uf electrolytic caps by a 4.7uf ones – similar physical can size. That lowers the HP F3 to ~ 7 Hz.

There are two 1uf signal connection caps among the L-R input volume pot as well as the chip’s input. With the chips impedance (30K w/gain set at 26dB), these caps form a 1st order HP, F3 = 5 Hz. The diagram has a table by cap values for growing that F3 releasing the L-R speakers from several bass duty.

TPA3116 NE5532 - Test Instruments Digital Subwoofer Power Amplifier Board

The chip’s gain is fixed 26dB. My PC output drove toward full volume as would maximum line outs. But my phone’s headphone out was feebler and I needed to front end it by a Sure head phone amp for added gain. Easy sufficient to front end that by a Sure BT module if you care (however that needs 12v power, an issue to resolve).

The front board switch is Standby – On (not off on). By means of this switch, there is not a turn on/off thump. Leaving this button in the on position as well as switching power will reason a thump.

Lastly, there are alike boards founded on the same core design. Maximum notably the version by 3 PS bypass caps in place of one. Coming from diverse manufacturers, the tripartite cap board has showed problems with constituent population affecting several problems.

This Test Instruments supports a diversity of Bluetooth devices. Answer the phone as well as make a call Numeric keys song collection. Can direct inset U-disk toward play MP3 music? Can direct inset TF card toward play MP3 music?

For the usage of power supply, this power amplifier does not need so large working voltage. You could use 12VDC voltage toward work on the TPA3116 power amplifier. Though, to use a power amplifier by a maximum power, I commend using an extreme voltage of 24VDC. In this scheme, I’m using 12VDC Switching Power Supply by current 8 Amperage.

The amplifier board accepts two introduced TPA3116D2 digital amplifier chip as the core, one piece as leftward and right channel power amplifier, additional piece as pre-bridge briver with NE5532 subwoofer ,with a small ,high efficiency, high power characteristics.

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