Tone control based on the Sony IC TDA7439.

 

Home
6C33 SET amp.
6H30 SRPP preamp
Accugraph
Adpcm PIC software
Air/Fuel monitor
Audiotron editor
BUF634 headphone amp
Diy photo PCB
Duracell battery test
EL84 SET amp.
FM stereo RDS transmitter
Four in a row game
Heat sink calculator
IR datalink examples
IR datalink RS232
IR datalink USB online
IR datalink USB standalone
IR datalink USB software
IR extender
IR sampler (iPhone/iPod IR remote too)
LED mood lamp
Light controller for (new) speed trainer/timer
Lundahl LL1931 MC stepup transformer
Max038 freq. gen.
Nelson Pass (x)ono.
Nelson Pass A40
Nelson Pass Aleph 5
Nelson Pass AlephP 1.7
Read Trainer
Record player accessories
Shooting timer
Speaker silver cable
Speaking shooting simulator
Speed trainer/timer (new)
Speed trainer/timer (old)
Surround vol. control
TDA1541 DAC (new)
TDA1541 DAC (old)
TDA1543 NOS DAC
Tone control based on TDA7439
Tuner with 6H30
Voice module for (new) speed trainer/timer
FAQ
Links
Shops
Home

My e-mail address:



Browsing through the Elektor magazine my brother found an interesting tone control based on Sony IC, but it was impossible for us to find this IC in any of the component shops we know of. We then found a very similar Sony IC the TDA7439, and this IC also gave opportunity to control the mid range band as a bonus. We are pleased with the finished result, and you can see some pictures of the design below (click on the picture to enlarge it):

The backside of the empty jog wheel pcb. Pcbfile updated 2011.07.28
This is the finished jog wheel pcb. We use a jog wheel with 15 pulses pr. 360° and a push botton.  
The backside of the empty display pcb. Pcbfile updated 2011.07.28
Take a look at the finished display pcb, which also houses the IR sensor. We have chosen a blue LCD with white backlight for the tone control.
The backside of the display pcb with components.  
The backside of the empty main pcb. Pcbfile updated 2011.07.28
The main pcb with components on board. We have chosen to use only polypropylene capacitors in the sound path, as we think the have the "best" sound. The tone control is controlled by a 18F452 PIC microcontroller.  
User guide in pdf format, showing the menu structure and the operation of the tone control. User guide v7
This is what the inside of the finished tone control looks like. We use an enclosure from the German firm Schaeffer AG.  
Close up on the flat cable connecting the main pcb and the display pcb.  
Zoom in on the IR sensor, we have covered the pins with insulation from some wire.  
Close up on the assembly of the jog wheel pcb and the display pcb. It is necessary to place a 3mm nut as the jog wheel axel is short and the LCD display needs more space from the front plate.  
The front side of the finished tone control.  
The back side of the finished tone control.  
This is what preset no. 2 'Pop' looks like. You can program 8 presets with our IR datalink and switch between them with a SONY compatible IR remote.  
The source files for a blank aluminum enclosure from Schaeffer AG. Alufiles updated 2011.08.30
The source files for a black aluminum enclosure from Schaeffer AG. Alufiles updated 2011.08.30

This page was last updated 2011-10-11.