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TDA7492 Digital Audio Amplifier Board 2x50W
Can this board (or any of these amp boards) be used for a guitar power amp? I'd use a tube preamp.
You could probably use this amplifier that way as long as the input signal from your tube preamp doesn't overload the input stage of the amplifier chip. It would be good to use a tube preamp that has adjustable output level to attenuate the signal as needed prior to the signal entering this amplifier board.
Date published: 2014-12-16
can one of these be used for combined input-output left, another for combined input-output right? will the shared input ground present any major problem with this, and will it deliver more power?
since i am a dumb person where does the power come in to this 7942? how does a two wire digital wire to it where can i get a complete schematic, so i see where to hook power.
The wiring diagram for this amplifier board is provided in PDF format above. The DC input should be connected to the middle set of screw terminals. Be sure to observe proper polarity as shown in the wiring diagram PDF, or else you may damage your amp board.
Date published: 2014-12-01
Can i use a 14.8v RC car type battery to power this amp? If so, how much real wattage would you expect to produce in mono. Something like this http://www.all-battery.com/148volt-5100mahli-polypack-1-1.aspx
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