After few months of break, I've returned to the 'electronics' experiments, and logged into this forum and fortunately my account was not tagged as dormant account. :D Sad to see your account was actually deleted. I remember once I screwed up my website too and had to build it again from Google cache cause I had no full backups. :( I believe the forum has backup but restoring (by overwriting) backup will cause the meantime posts to be lost, so backup is not restored just because the problem is of one user and not the greater community.
Most forums have karma facility but this forum doesn't have that, otherwise you've had granted enough points for restoring your rank. But now you have to start from 'newbie' tag again.
Best wishes for your new journey.... Will love to see your new experiments..............
[quote author="Sjaak"][quote author="Sleepwalker3"]Presumably the dots change in some way with humidity?[/quote]
Yes. they are chemicals which react with water from the air.[/quote] It's http://http://en.wikipedia.org/wiki/Cobalt%28II%29_chloride. In childhood I used to draw paintings with this used as sky color. If weather dry, it showed blue sky as in outside, and in rains it had a pink look for the humidity in air becomes high. :)
Opamp, dc-dc converter, audio amplifier, some 0603 capacitors.
All these bought from SM Electronics, who is Indian distributor for Mouser. Buying directly from mouser attracts $40 shipping, tension of customs, etc. Buying from them attracts little charge and it's good for small orders. My current order was near $10-12 only.
[quote author="rledyard"]"VA meter v3" Would you be willing to share details on that board?[/quote] It's a addon board for a homemade power supply that shows voltage, current, etc. However, the v2 was successful, this v3 has a bug in the PCB design. http://circuitsdiy.com/failed-prototype-vameter-v3
WOW. I didn't know tablet market has these cheap prices now. 2 year ago, I bought one for $180. I just saw a 4.3" small tablet running 1.2Ghz CPU, etc at $45 in DX.
@jbeale You can probably use the IOIO boad to have many GPIO from a android device or tablet. And you design the UI for your device too. http://www.sparkfun.com/tutorials/280
Laptop battery pack!! I guess they are 3 pairs of 3.7V battery in series making 11.1V at some 5-6AH rating. I'll not touch that hot battery. I'm happy with charging batteries of 1Ah range.
[quote author="matseng"]can make the battery go poof, sputter, bang and having flames erupting from it[/quote]The charger is for battery with embedded protection circuit. Originally i made this to charge my camera's battery and found that it does good job on mobile batteries too. In my experience with current design that gives near 400~500mA current with my 960maH battery (2 hours charging), I have never seen the battery to be heated. Battery temperature always remains at room temp. Charging current can be increased by higher rated power source and using higher Ice transistor.
The design is very simple and I recommend you to setup it on breadboard and give it a try. You'll not be disappointed for sure.
What I took out: [attachment=2] Some mini USB and micro USB sockets Two Instructables badge 1 Ultrasonic Rx/Tx pair 2 LM78XX breakout PCB 2 LED strips (green and blue) 12V USB IR TOY PCB JDM programmer signed by Ian 2pin polarized headers
What I put in: [attachment=1] Atmega32A-PU Breakout PCB / minimum system board Different types of mini-USB connectors 6pin PS/2 male USB A female IDC10 male My built JDM2 pic programmer (actually swapped with ian's) Indian FLUX micro SD card connector ICL7106 multimetr IC Philips logo Ring connector (crimp type) 0603 SMD LEDs HA13158A 4x34Watt audio amplifier IC (extracted from a car tape player, still works I couldnt add the pcb, sorry)
BOX now weights almost 1KG.
Next destination is Tayken, Japan because there was no reply for 7 days from chiragpatnaik, India.
Now There's a problem that I want to add some other things to the box but that will increase the box's weight and so the postage. Here's the things,
[attachment=0] Many PCBs of my projects, some that I got from giveaways. An SMPS (ian will recognize it :) )
Latest order from Seeedstudio arrived today. Boards look exceelent, especially the solder pads. They're glittering. My order was placed after the chinese holiday season, so it took 1month from order to arrival.
Changes I noticed in Seeedstudio's behaviour: PCBs are packed with an silica gel packet Between every two PCBs there is a paper to avoid scratch between them. :) Nice
