The circuit is based on LM1036N which is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected.
All you need for this project is the LM1036N, 15 capacitors, some fixed resistors and some potentiometers. The result is a high quality control circuit that is small, energy efficient, easy to make and enhances your audio listening experience.
Step 1: Step 1: Research
Take a look at page 6.
Without making any changes, the circuit performs just great, so if this is your first circuit - do not hesitate to build it - it will work if you don't mess the components!
The components that you will need are as follows:
- 47uF x 1
- 0.47 uF x 2
- 0.01 uF x 2
- 0.22 uF x 4
- 0.39 uF x 2
- 10uF x 2
- 10nF x 1
- 47k resistors x 4
- 47k potentiometers x 4
- switch x 1
- a 3.5 mm audio female and male jacks (could be any size jacks)
- some cables (use shielded for the input and output signals)
- an empty board that you will solder on
- soldering and wire cutting tools
- plastic enclosure
- knobs for the potentiometers
Step 2: Step 2: Experiment
When I was doing tests the overal performance was rather week and there was a lot of noise in the audio signal. You can skip this step and go on to solder all components if you are sure it will be ok.
I should mention that for the input signal first of all I use my fingers. Toching the input leads of the jack (left & right channels) must produce some bad noise. Try turning the volume potentiometer all the way to maximum. If you don't hear noise, you better not hook up your phone and investigate the circuit - maybe there is a short circuit or something is connected the wrong way.
NOTE: All electrolytic capacitors have to be wired the correct way. They all have markings on one of the sides (most commonly the negative side) and take some time to investigate this!
After I heard the noise in both channels, I hooked up my phone to the input and played some music. Test all knobs and see the difference in the music.
Another point to mention is the output signal. I have used some standart headphones to listen to the output. If you use speakers, you will be able to differentiate the low and high tones very precisely, but in case you use some headphones from your oldest kasette player you won't be able to see the real difference in the tone settings.
Step 3: Step 3: Build the Circuit
The second photo shows the circuit finished cut, with the output cables soldered from the botom side. Yellow and Red are the channesl and shield is the ground.
On the third photo you can see the tiny input cables. These actually come from an old set of headphones which is good as the 3.5 mm jack is already there and there is no need to solder it.
Step 4: Step 4: Get the Enclosure
I used short jumper wires to connect the potentiometers.
NOTE: Two of the three potentiometers' pins run in parallel, so you can save some wires by making bridge-like wires.
Step 5: Step 5: Enjoy
I use regular 12 V DC supply from a car lighter because this tone controller is in my car and I have no jack to the output cable as it goes straight to an amplifier.
Wish you success in building this circuit!