sk7cas mobile electronic lab — check it out!

sk7ca made up a great portable electronics lab (with /A LOT/ of arduino-stuff) in an old laptop case and a small road case. I am so thrilled about this, that I asked him if I could feature his build on my blog and here it is:

He found some really good use for these old computers that no-one seems to throw away but isn’t using it either. Note the VME-bus connectors used to interface the BB to the plugs – really nice.

In this case is all you would need to have some fun on the road – a ton of chips, a small MM and a bunch of wires!

Didn’t I promise a load of Arduino add-ons? Just a lot of bits of hardware that make prototyping fast and clean – just like you would want it on a portable lab.

Be sure to not only check out sk7cas video on this but also his youtube channel! There is a lot of stuff ranging from amiga music to water plasma in a jar….

More pics right here.

For me this is a definite /want/ – this old laptop on my shelf seems like it could use some modding …..:)

Luxury Junk

I just couldn’t resist bidding on some ebay deal where a guy sold his cellar of HIFI-electronics.
There was /much/ more than shown here. This are the parts, I probably gonna use in some way.

JVC GR-SX9 Video Camera

Some very old (1991) Camcorder, I gotta look into connecting it do the pc to finally get some descent webcam input.

AIWA AD1250 Stereo Cassette Deck

This is some very solid case, it will probably house a synth or a mixer in the future.

Blaupunkt 60W 3 Ohm Car Speakers

Just that, they’ll go into a boom-box.

Premier CB 2000 Citizen Broadcast Radio

This one is interesting because i want to get a ham license in the near future. It does not work atm but I’m on it. the amp on top is known as a “Brenner” (afterburner) or “Oma” (grandmother) here in austria. using such an HF-amp with CB is strictly forbidden. (4W only, 12W with SSB)

Hornyphon 6391 Stereo Amplifier, front face

Hornyphon 6391 Stereo Amplifier, inside

Yeah this one needs some serious cleaning and testing but it could very well become a good mate in the future.

AE EP#26 The Ultimate Breadboard

While I was working on my Oscilloscope project I discovered, that breadboards are only semi-useful for Bigger things. Everything seems not to add to your project but to just pile up on it. After you added some probes and things that need a bus you will sit on a fragile, unforgiving crapstack, that just waits for you to stick a jumper-wire in the wrong hole. So I decided to make myself some room on the board and push connectors, displays and meters away from the center. Just take a look what came out:
Breadboard in a pic

check out the vid to get a walkthrough

So here is a little list what it includes:

* 2 max 232 Level converters
* An arduino NG
* 3 BNC connectors
* 8 banana Plugs
* A 50 V voltmeter
* Tiny tiny breadboard for displays and button stuff
* 4×7-segment display with driving transistors
* Datavision DV-20208 HD44780 compatible LC-display
* 2x lm3914 bar-graph displays with jumper selectable voltage range
* Avr-Net-IO for some Ethernet
* A -10V -5V GND +5V +10V earth 0V 35V Power supply
* and of course a humongous breadboarding area

This is of course just a source of ideas so if you make one of your own please let me know and if you don’t publish yourself, I’d be delighted to show off pictures of yours here!

Some words on construction:
The base is made from a piece of structured plastic (45 x 30 cm) on top of that are some pieces of wood with some plastic veneer that form the body. This makes up the wedge form in the back. On top once again I used some sign plastic covered with red spraypaint, why red? because its shiny 🙂
Ground and Earth are normally separated and can be connected on demand.

List of inspiration and components the Voltmeter was in this pack: Einbau-Meßgeräte-Sortiment 10 verschiedene, Volt- und Ampermeter und Hz-Messer

Here is a little zipfile containing the PSU-design and the VU-meter: PSU_LM3914

PS.: the space above the tiny breadboard is reserved for some raspberry-pi…

AE EP#20 Industrial Controller Teardown & Homebrew Scope Ideas

Hi, I just started a dream project: Building an oscilloscope from scratch. Originally I wanted to use a russian 13LO37I but it turend out to be too bulky so I went and scored a waaay smaller 3KP1 / DG 7-113 from ebay.
I’ll put up a high res Photo of the tubes weiring system at my website.

One of the first portable TV-sets:

The DG 7-113 / 3KP1’s wiring system:

The russians 13LO37I / 13ЛО4И:

I found the first plans at Jogis Röhrenbude:

AE EP#17 Super Simple High Voltage Supply

My last video reminded me of one of my very first high Voltage Projects. It is a Push-Pull high Voltage converter, that is made out of an old flyback transformer from a black & white TV-set, 2 2n3055 Transistors, 2 resistors,1 cap and a bunch of wires. It performs very well and reliable .

find the original circuit at: