Review on TDA7498 High Power Digital Audio 🔊 Amplifier Board 2x100W 18-100KHZ Module - Enhanced SEO by Sally Romero

UPDATE: See pictures. The second of three boards came with no plastic plugs and a large scratch around the screw next to the QC sticker on the board. So much for the QC to ensure all the parts are in the box and there is no visible damage to the PCB unless they are selling new used units? Also, do not trust this add-on too much as it contains many bugs. What I like most about this sound card/amplifier is the frequency range from 18 to 100,000 Hz. Please open the data sheet of the TDA 7498 and show me where this fact is stated. Still hanging there with a star. Okay, let's talk about this amp (what it does and doesn't do). First you need to understand this amplifier, so pull up the datasheet for this device TDA7498 not TDA7498E. This amp is rated to drive 6 to 8 ohm speakers, it can drive 4 ohms but you can't drive both channels up to 100 watts each and the IC can't handle much more than 6 amps or the overcurrent trips and turns it off. It also didn't have thermal paste between the TDA7498 and the heatsink, which isn't great since I read the first review, so I checked before I started testing. Then I run a test with a 1kHz sine wave through a 100W 4 ohm resistor and put two of those resistors on a large heatsink with a 4 ohm fan load per channel. To power this amp I used a 0-32 volt O - 10A power supply. I tested at 12,18, 24, 28, 32 volts. 28 volts was the maximum voltage I could use to drive both channels at about 75 watts RMS per channel. I would highly recommend blowing a fan directly onto this heatsink as it easily reaches 100C without fan cooling. I have seen efficiency in the 80-90% range for this class D amp depending on what voltage and power you are using. But with 150-200 watts RMS power at 90% efficiency, you still need to dissipate up to 20 watts of heat on this small heatsink. The addendum also states that you can power this amp with either AC or DC power, it has a diode which can give you half wave rectification, but I believe the diode should prevent the + and - supply lines from being mixed up. So it worked out fine, but I'd like to see better written ads that don't force or miss opportunities to attract buyers/customers.