Showing posts with label else. Show all posts
Showing posts with label else. Show all posts

Sunday, October 26, 2014

Recycling an old VHS-recorder Power Supply (2)

Recycling an old VHS-recorder Power Supply (2)
 ==> Safety First! 

>>> first part available here <<<


Do you remember the "2x5W Amplifier for mp3 player or line output (MK190)" article?

It's now time to make safe connections for the Power Supply Unit : 


Starting from this : 

1/ cutting wires: 



2/ Soldering to female isolated pins:


3/ Adding isolating plastic:


4/ Repeating the process (2 & 3) for the 17 other pins.


5/ Transferring the voltage table on the supply case following the one i set up previously: 



6/ Enjoying the result:


ZappyDay : un système d'enchères basé sur les tests d'applications

ZappyDay : un système d'enchères basé sur les tests d'applications


Déclaration des conflits d'intérêts :
Attention, cet article est 'sponsorisé' (l'utilisation du lien de parrainage pour s'inscrire me fera gagner des points : un bon moyen de me soutenir), il n'est donc potentiellement pas 100% indépendant comme le sont généralement les autres articles de ce blog.

Ayant découvert ZappyDay récemment, j'ai décidé d'essayer ce service pour la simple raison qu'il est gratuit  et offre une bonne raison de tester des applications que je n'aurais pas pensé utiliser un jour.

Le principe :
  • Découvrir et tester des applications à partir d'une liste prédéfinie
  • Recevoir des points lorsque le retour sur expérience est rendu
  • Participer à des enchères à l'aide des points récoltés
La compatibilité :
  • Android
  • iOS (iphone, ipad)
  • Windows phone

La mise en oeuvre :
  • S'inscrire (via ce lien de parrainage)

  • Choisir une application dans la liste

  • Attendre l'e-mail contenant le lien (qui redirige vers le google play par exemple)

  • Télécharger l'application

  • La tester

  • Rendre sa conclusion (ergonomie, utilité, note globale et commentaires)
plusieurs étapes : 
Noter l'application 
 Répondre à la question de vérification (exemple pour Opera Mini)

  • Recevoir les points 


Choisir les 'cadeaux' : via un système d'enchères
Une liste évolutive des cadeaux disponibles permet de choisir quelque chose en posant une enchère : 


Conclusion :


  • ZappyDay est un site qui permet de gagner des cadeaux en téléchargeant des apps
  • ZappyDay est 100% gratuit (presque : cf le Nota Bene à la fin)
  • ZappyDay fonctionne pour les smartphones Apple, Android, et Windows Phone

Si ça vous tente, inscrivez-vous via ce lien  NB :

  • Le téléchargement des applications se fait bien depuis les marchés officiels de chaque plateforme et non via un marché alternatif comme je le craignais au premier abord (une meilleure visibilité de ce point sur le site serait une bonne chose)
  • Il est aussi possible d'acheter des points... même si celà dénature un peu l'idée du 100% gratuit et fait un peu 'pay to win'. Heureusement cette option n'est que très secondaire.

Friday, October 24, 2014

2x5W Amplifier for mp3 player or line output (MK190)

2x5W Amplifier 
for mp3 player or line output

To continue the project of making an Audio Amplifier for my devices (as written when recycling an old power supply), here is the nearly step-by-step WIP : 


MK190
MK190

The kit used is the Velleman MK190 2x5W.

Perfectly noob-friendly protocol:

MK190 manualMK190 manual


Steps 1-3: 
MK190 Printed Circuit BoardMK190 Printed Circuit Board

Step 4:
MK190 Printed Circuit BoardMK190 Printed Circuit Board

Step 5: 
MK190 Printed Circuit BoardMK190 Printed Circuit Board


Steps 6-10: (forgot to take pictures..)
MK190 Printed Circuit BoardMK190 Printed Circuit Board


Step 11:
MK190 Printed Circuit BoardMK190 Printed Circuit Board


MK190 Velleman Module Audio Amplifier 2x5W



Does it work? actually, it does!


MK190 Velleman Module Audio Amplifier 2x5W
MK190 Velleman Module Audio Amplifier 2x5W

The set up: 

  • Old Speakers taken from Out-of-Order HiFi, 
  • My lovely Old Robyn (Xperia X10mini), 
  • Old VHS power supply,
  • Spare cables taken from trash electronics (burnt ATX-PSU),
  • A little jack-jack 3.5 cable (1.50€)
  • Velleman MK190 kit (9.90€)


So i simply used the old power supply to get 12Volts : 



Plugged pin 5-6 (12.6V) and 7-10 (ground) to the power input of the module in a quick and un-recommended way : 


Now that it works, what's next?
The only work left is to make clean and safe connections to the power supply, and find a box that fits all. ==> Making safe connectors

Part 2: A better looking result

Part 3: Adding a better PSU

Saturday, October 11, 2014

Recycling an old VHS-recorder Power Supply

Recycling an old VHS-recorder Power Supply

A week ago an old broken VHS-recorder came home, driving belts were Out of Order, the 3.7V battery was leaked and the board partially burnt : nothing to get out of this?

In fact many things can be recovered : 

  • Screws
  • Springs
  • Metal housing
  • Motors

But that's not all, since Power Supply didn't looked destroyed, maybe we can find another life for it?

   

First there is a need to know which outputs are common, and then which Voltages are used.



Common outputs (pins):

A quick look to the PCB shows a lot of common wires, a closer look shows the following (verified using a multimeter : 0Ω indicates that the wires are common.)
Numbers are counted from left to right when looking to the port like this :

==> The two groups of pins that are in grey are common.
==> There is a 2Ω resistivity between pins 1 and 2, so i'm not sure they could be considered as common.

Assuming that Antenna blocks are linked to ground and that there is a 0Ω result between Antenna, pins 7:10;17:18, and a large amount of 'open' places on MotherBoard : pins 7:10;17:18 can be considered as ground (i hope so).

Now, Voltages

So there are a large range of Voltages available, but i'll mostly use 12V pins to power PC Fans and a future project i have  :



Tuesday, March 4, 2014

Laser-Beam from DVD burner : some experiments

Laser-Beam from DVD burner : some experiments

The set-up : 
  • followed this article as a base
  • with the following stuff : an old PC-PSU, a laser-diode from DVD Burner, an adjustable voltage regulator (LM317T), a 100ohm potentiometer, 2x 1N4001 diodes, a 47µF capacitor, some wires, thermic pasta, and a heat sink.

DVD-burner cover : 


soldering details : 



the laser-diode case : 



Now, some data : 
Circuit Input : 5V
At the laser diode poles : from 2.0 to 2.4 V (depend on the potentiometer setting )




a small video of the working circuit : 

details : 
the laser burning the surface : 

now passing through the plastic sheet : 




burning results : small dots of melted plastic, not impressing, but quite good for a first trial :