×

SparkFun will be closed for Labor Day (9/7/2015). Orders will resume shipping out on Sept 8th. Have a great weekend!

mct75

Member Since: June 23, 2008

Country: United States

  • Mr Crowley!

  • That’s for when you want to reflow solder it ;)

  • The idea of a “crypto chip” on OSHW concerns me. Does it have keys or similar loaded into it, or can anyone buy the atmel part and make it work?

  • Any chance of a non-religious version coming out? My PCB doesn’t have enough space for fairy tales.

  • Is there any way we can get the code that comes preloaded on these? I love the “bouncing ball” effect!

  • I think you’d need to just run power off the FIO board and over to the vias on the fuel gauge. Considering it uses an ASIC for monitoring the SOC, I have a feeling maxim would have realised that you need to charge the thing at some point :P

  • Why is the pin spacing botched? I don’t see any advantage to it.

  • Hey all, I finally got this amp for a car audio project, but I’m currently diving some Technics 3-way cabinets. 12 volts into 8 ohms, with a 94 dB/W sensitivity. It’s hellishly loud. I was dubious at first about how loud such a dinky little chip could be. But it’s house-fillingly loud, even at half power.<br />
    <br />
    I originally was having a problem similar to Puffyfluff where the speakers would thump hard at maybe 5 hertz, along with the Peak light flickering. This thumping was triggered by loading the amp even slightly more than minimum. Once it began thumping, nothing would stop or change it until I powercycled the board. I went through the whole board trying to rule out feedbacks and bad soldering joints, and impedance issues, and 3 separate volume settings. The issue turned out to be the ATX power supply I was using. With nothing but the amp loading it, it started ringing and I guess it coupled with something on the opamp or 540. Adding an old CD drive and spinning up a cd was enough to stabilize the output. <br />
    <br />
    AGAIN: If your amp is thumping just check your power supply! <br />
    <br />
    Once this issue was resolved, the amp was bulletproof. Noise rejection, channel separation,and sound quality are all superb. Even when I loaded it hard enough to get the peak light to flicker, the sound quality wasn’t even affected. The heatsink gets comfortably warm: I measured the package to be at 104F (40C). <br />
    <br />
    If I had to change something about this unit, I’d get rid of the dual volume controls. For the hundreds of applications this thing has, the need for independent channel adjustment is only required in 3 of them. I have a dual-pot on order from eBay that’ll replace the two independent ones on the board. If Sparkfun insists on having balance adjustment, just have a master volume and a L/R balance pot like a normal amp. Also, the option of RCA inputs and a little better polarity labeling would be nice.

  • Do you plan to make/carry an analog-to-bargraph IC? I’d love to have some of these going as analog indicators but I can’t have each one eating 10 GPIO. Also, inb4 shift register.

  • I was guesing they were being driven at a low level in that picture, or maybe some HDR was applied. I’d rather see the segments in a dark room and wash out the rest of the picture, but I digress. Awesome product.