Voltlog #75 – InTheMail

As mentioned in the previous video this month will be mostly InTheMail episodes because I just have a bunch of stuff from China and I gotta show it to you before I go use it on other projects. Same as before I tried grouping similar items in this episode so let’s get started on another InTheMail.

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

  • Bourns 10K 10 Turn Potentiometer
  • Plastic Rotary Knob 6mm Shaft 10pcs
  • 16mm Potentiometer Knob Black With 6mm Shaft
  • 3P4T 3 Pole 4 Position Rotary Selection Switch
  • On/Off Momentary Push Switches
  • PBS-11A Locking 2 Pin On/Off Switch
  • KSD9700 Slim Bimetal Temperature Switch
  • KSD301 Bimetal Temperature Switch
  • 2mm Binding Post Plug Connectors
  • M5 Banana Jack 4mm Socket
  • 3.5mm Slim Metallic Stereo Jack 4 Pole
  • JST XH 2.5mm Connector With Wire Set
  • 1007 Hook Up Wire 24AWG

Links to all of these products are in the video description visible on youtube.

Voltlog #74 – InTheMail

A list of the items shown in this video:

  • Dual Channel Digital Thermocouple Thermometer
  • Soldering Iron Handle 50W A1322
  • Screwdriver Magnetizer / Demagnetizer Tool
  • Rechargeable NiMH Battery AA
  • AA Battery Plastic Storage Box
  • Cone Step Drill Bit HSS 4-22mm
  • Hollow Needles Desoldering Tool Kit
  • Diamond Files Set
  • Brass Standoff Assortment Kit 300pcs
  • Silicone Lubricating Oil
  • Kontakt Spray Can

Links for all of these items will be in the video description which is visible 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 #72 – DIY AC-DC Off-Line Converter With TNY276/TNY277

This is the first AC-DC power supply that I’m designing and building. Everything seems to work up to a point where the chip (TNY 276 from Power Integration) gets too hot and enters thermal protection. This is where I’m asking my viewers help to jump in with suggestions on what might be wrong.

This is part 2 where I get the circuit working by switching from the TNY276 to the TNY277 which has a higher power rating and is probably the proper IC to use with this transformer (EE1616 ER2741)

And this is part 3 of the video where I finally find the real fault in the circuit. It turns out I was right, this circuit should have worked with the TNY276 as well and it wasn’t the higher power rating of the TNY277 that fixed the issue.

Voltlog #71 – Electronic Touch Musical Keyboard Kit

A while ago I saw this touch musical keyboard kit on banggood and it seemed interesting enough to order one. It turns out the kit is using a single atmega8 to do all the touch sensing (8 ch) and play the tunes accordingly. Although not very useful for me it sure was fun to assemble and play with.

Voltlog #69 – LM317 Kit Assembly Fail

Sometimes, when I have some spare time I like assembling these cheap kits coming from China. Today I am assembling an LM317 adjustable power supply kit complete with voltmeter. Unfortunately they sent me a wrong resistor value so the kit didn’t work as expected but I was able to fix it in the end.

Voltlog #68 – InTheMail

A new InTheMail video containing a bunch of different stuff i got from China. If you like these videos don’t forget to subscribe to my channel and hit the like button because that always helps.

List of items shown in this video:

  • HAKKO FG-100 (clone) Soldering Iron Thermometer
  • A6 GSM/GPRS Breakout Module
  • Sharp Multimeter Probes 1000V 20A
  • TEC1-12706 Peltier Modules
  • Plastic Bottle With Needle
  • Universal Power Socket With Dual USB Charging Port
  • 14 Types Tactile Switch Push Button Set
  • Ceramic Fast Blow 1A 250V Fuse
  • Outdoor Waterproof Shockproof Airtight Survival Case

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

Voltlog #67 – Precision Current Reference Using REF200

A while ago I watched a video from Scullcom Hobby Electronics channel where he build a precision current source, a very simple but accurate one. If you don’t know this channel I encourage you to subscribe to it, it has allot of nice videos on lab equipment either building DIY versions or reviewing existing ones. Each video has nice drawings and the guy clearly knows what he is talking about so a great resource for learning.

I don’t have any current source in my lab, and these are useful for testing multimeters for example. I was looking on ebay for a current source but I wasn’t able to find an affordable one so I’ve decided to build one using the project information from that video and I will link the video in the description below, it’s nice to watch it has lots of interesting explanations so I won’t repeat them in this video, I will mostly focus on showing you how I build and improved my current source.

Voltlog #66 – Cheap NiMH Rechargeable Battery Testing

If you were following my InTheMail videos you probably seen these green rechargeable batteries that I got from ebay quite cheap, I think they were like 50 cents a piece. I got 4 pcs in AA size and 4 pieces in AAA size and little did I know about how crappy these could be.