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