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TDA7492 Digital Audio Amplifier Board 2x50W
I see references in other questions to a schematic, yet nothing came with mine. I assume the so-called Phoenix connectors are as such: Left one is for left output, right one for right output and middle for power. Should I have received a schematic?
I bought 2 of these amps. I did not get a schematic for either. There is a schematic on this page that shows how to wire this amp, except it does not explain or show how to run this in 100x1 @ 4 ohms. I would really like to have the schematic updated to include this information since it's listed under the details.
Date published: 2014-11-18
Can we get separate or updated wiring schematic to shows how to bridge this amplifier? I think that would help a lot of us out.
This amplifier cannot be bridged in the conventional sense, because the Class-D amplifier chip already contains four internal amplifier channels that are bridged internally before the output pins, so each channel already has a "BTL" or bridge-tied load configuration. This is referred to as a full-bridge Class D amplifier. However, you can wire the two channels of the amplifier in parallel at the inputs and outputs to create a "parallel bridge-tied-load configuration", or "PBTL". You don't get any additional output power from this arrangement for a given impedance, but the amplifier chip will become stable at 1/2 the typical minimum impedance for the chip (so this amplifier which is normally capable of driving a 4 ohm load will be able to drive a 2 ohm load). Cutting the load impedance in half as enabled by the PBTL configuration will allow the amplifier to double its power into this halved impedance.
Date published: 2014-11-21
How to achieve BTL 100w x1 into 4ohms? The description says that regular BTL 100x x 1 into 4 ohms is possible, but in previous questions on how to mono, the answers were to parallel the output which if im not mistaken results in 50w x 1 into 4 ohms.
I have 2 8 Ohm speakers. Can I use a 24V 3A power supply (72W) rather than the 24V 6A power supply and get the same results. One, the 6A supply is a lot bigger and takes up too much space in my project and two I can get a 3A on ebay for $13.
The answer is YES as long as you don't expect to get full output from the amp. Efficient as these are you can't circumvent the laws of physics! To get 70W x2 (what I believe is the real practical output power of these amplifiers) you need to supply at least that much + that lost as heat. Class D amps can run 80% efficiency so you would need a minimum of 84W from the power supply to have any chance of getting 35W per channel out.The bigger issue will be an amp starved for power sounds horrible at the overload point. If the 24V 3A supply is a must, try and add a few large value caps (2200uF @35V) to the output to act as sort of a power reservoir.Good news is you won't break anything by playing with this little amp and the 3A supply. Try it out as see if it works!
Date published: 2014-11-28
Hi, What do you mean when you say "combine inputs" to be able to bridge? Thanks.
can this be bridged to a 8 ohm load? If so what is the rated power out bridged 8 ohms?
In order to bridge this amplifier you have to combine the inputs and parallel the outputs, basically wiring the output positives together as well as the negatives, then run this singular output into the speaker. It will work with an 8 ohm load bridged, although we do not have a specific power output rated for this load.
Date published: 2014-11-14