(6 Reviews)
Write a Review (requires login)
I used this module to create a low-power acoustic guitar amplifier. I connected a woofer to the output of one channel and a tweeter to the other channel. By including a potentiometer on one of the inputs, I am able to achieve very nice fidelity in my acoustic "blend". I built the amplifier in a little plastic box and had no trouble getting it to work. I glued a little piece of metal onto the chip to act as a heat sink, but in retrospect that was unnecessary, because the chip gets warm, but not hot, in this very efficient amplifier. This module is a great utilitarian amplifier, and I highly recommend it.
These little boards are definitely not breadboard-friendly. You have to use a speaker for the load, because a 10-Ohm resistor 1/4W WILL burn up when hooked up to the differential outputs. I increased the resistance to 470 and was able to get the output to show up. The SW inputs WILL stop the board from generating outputs if shorted together. Gonna have to search the parts bins in order to find a small speaker for further testing.
The IC spec sheet says gain is controlled via a analog DC level in respect to a reference voltage. Essentially a pot could provide this... if i could remove a SMT resistor.
The module was simple to hookup and performed very well immediately thereafter without the addition of any other components. My only question is about the two "SW" connections to the PWB - which I left unconnected. Connecting them through a switch should either "MUTE" or "Shutdown" the amplifier, but I'm not sure about that. If anyone knows what the "SW" function is I would appreciate finding out about it.
Nice mini amp board. Well worth the money. It does heat up though, so I added a little heat sink (piece of metal)
to the chip with glue. The SW is in case you want to add a mute switch to it. All in all good amp.
| 100 + | $0.27 ft |
| 500 + | $0.25 ft |
| 25 + | $0.66 each |
| 100 + | $0.62 each |
| 25 + | $2.00 each |
| 100 + | $1.85 each |
| 10 + | $1.25 each |
| 10 + | $2.53 each |
| 100 + | $2.10 each |
| 10 + | $8.49 each |
| 100 + | $7.08 each |
| 10 + | $3.55 each |
| 100 + | $3.10 each |
| 100 + | $0.18 each |
| 500 + | $0.14 each |
| 1000 + | $0.10 each |
