Category: Stopped/Failed projects

Jan 03 2011

LED Sign

Some time ago Reddevil gave me 6 led panels from a led sign. (Story [Dutch] can be read here: http://www.schematheek.net/index.php?p=forum/topic&t=337)

 

I made a frame from din rail to mount the panels on:

 

I also thought of how I’m going to make the power supply.

For every 2 panels there will be a transformer, rectifier, capacitor and voltage regulator. The voltage regulator will be a diy one that consists of a 2N3055 tor and a opamp)

Circuit power supply:

 

The LED sign is going to be controlled by a pc via usb. The usb gets “translated” to the signals for the led panels by this pcb:

 

All the pcb’s and transformers mounted on the frame:

 

2 test video’s:

 

The spreadsheet I used to draw the drawings: https://spreads…NWmdzcUE&hl=en

 

The next step will be getting the usb interface working. Then I’m going to make a pc program to drive the led sign. Maybe I even include pwm to dim pixels for video.

Jan 06 2011

Symmetric Power Supply 0-70V @ 5A – Update

This update was already planned in October 2009, but I didn’t put it on my site until now.

I made a pcb for the help power supply. First I added a few extra coils on the main transformers, but the voltage was too low, so I removed them and bought some print transformers

The pcb:

Mounted:

The analog print is also finished

When I wanted to test the analog print I looked at my circuit drawings before. Then I noticed that the analog print works on 2*5V while the power supply outputs 2*12V. So I designed the digital pcb and put a 7805 and a 7905 voltage regulator on that.

I made a small pcb to connect the lcd with the digital pcb. The connector from the lcd had a two small pitch to solder strong wire to it. So I glued the pcb on the lcd, connected it with small wires to the lcd and soldered “big strong” wires on it to go to the digital pcb.



Apr 20 2011

Solder Fume Extractor

When I fitted my desk with led lighting I had to remove my solder fume extractor. Therefore I build a new one now.

 

The new one is build from pvc pipe (which is build from pvc L-profiles). The fumes are sucked away and brought to a filter. (The old extractor only sucked the fumes away so they didn’t come in my face).

 

I have put 5 50mm fans right in front of the solder place:

http://image.elektronicastynus.be/78/1300648179.jpg

 

Video of the test:

 

http://image.elektronicastynus.be/78/1300641885.jpg

 

The smoke is transferred trough the pipe to 2 120mm fans, on these fans I’m going to mount an filter, but I don’t have that yet.http://image.elektronicastynus.be/78/1300641888.jpg

http://image.elektronicastynus.be/78/1300641891.jpg

http://image.elektronicastynus.be/78/1300641894.jpg