Friday, 22 November 2013
While audio was playing (with about 12 ohms across the input to ground) it was fine but there were very large pops when sounds started and stopped. I suspect (but I don't have a scope available to check) the module centres its signal on 1/2Vin but turns off the driver when it's not using it. That results in a big step signal when it turns its signal on and off, causing a pop.
Thanks to a tip from the AskElectronics subreddit, I now plan to build the headphone out circuit from the datasheet and then find some way to mix that with the existing headphone in, if possible.
Monday, 11 November 2013
I made this turned speaker for my girlfriend's birthday. It makes use of the boost converter described in my Instuctable. It was a bit of rushed build so I didn't have time to take pictures but here are the specs:
- 5V input to boost converter from a USB connection, boosted to ~18V.
- That 18V goes as input to a 10+W amplifier module.
- The amp drives a 3" full-range driver for 100-20,000Hz output.
- It's all housed in a purpleheart case that I turned on the lathe.
- After drilling holes for the accessory ports, I filled around them with Sugru for a nice finish. I also used Sugru to add some rubber feet.
Sunday, 15 September 2013
Monday, 8 April 2013
Monday, 11 February 2013
Wednesday, 30 January 2013
Sunday, 27 January 2013
Had a good time on the lathe yesterday. I turned this bowl from cherry. My first try at a decorative rim went quite well and I was pretty happy with the shape.
Unlike the previous two bowls that I attempted out of zebrawood, it neither smells bad (zebrawood smells like cheese), nor did it explode and go flying off the lathe!