Another WS2812b VU Meter (Tiny version)

Hello friends!
About a month ago I bought several pieces of WS2812b LED strip. Why not make another VU meter?
I decided to make mini VU meter for single channel which can fit to CFL lamp base.

Cheap LED string rework (220VAC to 12VDC)

Hi friends!
Before New Year I've searched for a multicolor LED strings to decorate my home. But there was a problem. All strings at our stores must be powered from mains 220VAC. But there are some places at home without mains power outlets due to safety and 12VDC only. And the other reason is poor quality of most these products. Some of them are really dangerous and can burn without any visible reason.
So I decided to make some rework of a cheap LED string.

Click on any photo for full size.

60+60 series LED's work with 12VDC supply

Analog audio via UTP twisted pair

Hi all! Every time I want to listen music from my collection in another room (ex. kitchen), I have to take my tablet, connect it to audio system and setup streaming over WiFi. It's boring.

But what about direct audio from sound card to another room without network transcoding? I know there are devices starting from low costs to high-cost multiroom systems. Not my choice. It is interesting for me to make some kind of "multiroom audio" by myself =)

Buck-Boost LED Driver (34063)

Hi all! Earlier this year I've made improved version of 34063 LED driver. This is combined buck-boost converter witout output voltage inversion. Now I have some time to describe it =)

9V multimeter powered from single AA battery

Hi! Another 9V battery was dead in my 830 multimeter. I've used this situation to make some modifications. I have a lot of half empty AA and AAA batteries, so I decided to power up multimeter from 1.1V (fresh AA/AAA have 1.5V).

Light for Dremel Workstation 220. New version.

Hi!
About two years ago I've made a work area lighting for my Dremel Workstation 220. Really simple  - 3AA batteries, resistor and a bunch of white LEDs (all in parallel) from broken flashlight. Not bad, but these LEDs have narrow light spots and large power consumption.

74HC595 breakout board

Recently I've bought a bunch of cheap 74HC595 shift register IC's. But SOIC case is not suitable for solderless breadboard. I didn't want to buy this IC's in a DIP case too, so I've made my own breakout board for them.
Single side PCB with 3 jumper wires on top side. Not so small as Adafruit's (for example), but easy to make with laser printer and iron. Supports daisy chain.

Etched PCB's

3A USB device charger (LM2576) (Updated)