Voltlog #122 – C5W LED vs Incandescent Bulb Temperature

Welcome to a new voltlog, in a previous video I showed these C5W LED bulbs that I got from ebay they were very cheap so I put them to a test and discovered they reached very high temperature in just 15 mins of running in free air which got me concerned, the fixture of this bulb could melt.

C5W LED Bulb on Ebay 

C5W LED Bulb on Aliexpress 

C5W LED Bulb on Banggood 

Thermometer used in this video

Voltlog #83 – InTheMail

Hello, and welcome to a new InTheMail. It’s been awhile since we’ve had one but don’t worry small packages from China continued to arrive, even through the holiday season and as a result I have plenty of new stuff to show on video.

Voltlog #77 – InTheMail

Here is a list with the items shown in this video:

  • USB Drive Spy Camera
  • 35W Radar Motion Sensor Switch
  • 4 Channel Wireless Remote Control Switch
  • 64 LED 20W 2835 Horizontal Led Light
  • 64 LED 60W E27 5730 Light Bulb
  • 21 LED 15W E27 Globe Light Bulb
  • 21 LED 15W E27 Energy Saving Light Bulb

Links for all of these will be in the video description on youtube.

Voltlog #73 – InTheMail

Welcome to a new InTheMail, the series that everybody seems to like, seriously I’m thinking this is starting to look like some group meeting where we all have the addiction to keep purchasing cheap electronic stuff from China.

Here is a list with the items shown in this video:

  • SG3525A PWM generator module
  • Photocell Automatic On/Off Light Switch Relay
  • B0505S-1W Isolated 5V DC-DC Converter
  • 5V 2A DC-DC Converter USB Charger With Voltmeter Module
  • 5V 3A DC-DC Converter USB Charger Module
  • 12V 0.5A AC-DC Switching Power Supply Module
  • LCD1602 I2C Serial Interface Adapter Module
  • WS2812 RGB LED Controller
  • WS2812 RGB LED Strip PCB Module

You can find links to all of these items in the video description visible on youtube.

Voltlog #51- InTheMail

Here is a list of the items shown in this video:

  • Led 1w amber
  • 3W cool/warm white LED
  • 6W COB LED
  • 16×2 LCD HD44780
  • CREE XPE-R3 LED Mini Penlight Flashlight AAA
  • Green High Power Burning Laser Pointer
  • Green Laser 473nm Protection Glasses
  • HT7333 LDO Regulator
  • 2xAAA Battery holder
  • AAA 1.2V NiMH Rechargeable Battery
  • Terminal Block Connectors
  • 20 Pcs Gold Plated 4mm Banana Plug
  • Silicone Rubber Fan Mounts
  • 16mm Rotary Knobs
  • Neodymium Countersunk Hole Magnets
  • Dental Mirror
  • New T-Handle Tap Wrench Capacity M3-M6

You can find links to all these products in the video description.

Voltlog #40 – InTheMail

Once again too many mail items to fit into a single video, so we have a two parts upload. In the first video I only had time to show two items the SONOFF from ITead and the SP mini from Broadlink but that is including teardowns and discussions on the internals.  Surprisingly the SP mini doesn’t use the ESP8266 as expected but instead it uses the MT7681 from MediaTek.

Voltlog #15 – Kit Assembly LED Rotating Persistence of Vision Kit

The assembly of this LED persistence of vision kit started well but it soon went bad because of poor design and lack of instructions. There is no documentation on how to assemble the mechanical parts so you have to figure that out yourself. There is no mention or pictures of how the LED’s should be soldered and to my surprise they need to be soldered on the edge of the PCB. There is no information on how to load the firmware or custom text patterns. After some research I did manage to find a chinese app which is supposed to work with this kit but I had no success in writing/uploading anything to the microcontroller.

I even spent an hour or so with google translate and, translated to english most of the buttons and messages in the app.

At this point I’m not sure if my problem is in the hardware(unlikely) or if I need to program the microcontroller, or if the microcontroller has some firmware and I just need to upload a custom display pattern using that chinese app.

Too much time & effort has been wasted so I’m not going to follow this anymore. My recommendation: don’t buy this kit unless you have too much free time and you enjoy solving complicated (chinese) problems.

Voltlog #11 – InTheMail ICR18650-26F NCR18650B Mifare RC522 RFID Xiaomi 5000mAh

Another VoltLog InTheMail, this time I receive the following items:

  • ICR18650-26F 2600mAh 3.6V Rechargeable Li-ion Battery.
  • NCR18650B 3400mAh 3.7V Rechargeable Li-ion Battery.
  • 3S JST connector cable.
  • DC-DC 0.9V-5V USB Output Charger Step Up Power Module.
  • ESD Anti-Static Shielding ZIP LOCK Bags.
  • Mifare RC522 RFID Induction Reader Module.
  • 100 Pcs 0805 SMD LED Diode 5 Colors.
  • Original Xiaomi 5000mAh Ultra-thin 9.9mm Power Bank.
  • TI Precision Amplifier Quickstart Kit AMPQUICKKIT-EVM
    OPA313, OPA314, OPA316, OPA170, OPA171, OPA172.