This is my first instructable. I'm going to teach you how to make an 8-channel amplifier for a computer or audio system with separate analog outputs, I've used it for my desktop computer, to watch movies, listen to HD music and play games, additionally you can install a codec to extend the audio to all channels in case the driver does not support it.
The circuit is based on the amplifier TDA2002 and TDA 2003 of 8 watts and 10 watts respectively, the latter for the wooffer.
Step 1: Materials
We need the following materials:(I recived them... ^_^)
- 7 TDA2002
- 1 TDA2003
- 8 resistances 220 ohms
- 8 resistors 22 ohms
- 8 resistors 1 ohm
- 16 capacitors of 100 nF
- 8 electrolytic capacitors 10 uF 25 V
- 8 electrolytic capacitors 470 uF 25 V
- 8 electrolytic capacitors 1000 uF 25 V
- PCB template
- virgin circuit board 10 mm x 15 mm
- aluminum heat sinks
- 3 stereo pots 10 kilo ohms
- 2 mono pots 10 kilo ohms
Input and Output
- 4 stereo jacks
- 4 double terminals for speakers
- 6 resistances 22 kilo ohms
- speaker wire
- lower switch
- soldering iron
- permanent marker
- isopropyl alcohol
- anti-solder mask
- PCB drills
Step 2: Make PCB
We will proceed to clean the circuit board with isopropyl alcohol, to remove grease and dirt.
Step 3: Transfer
Print the circuit on glossy paper, it can be special transfer paper, magazine paper, or other.
We cut the edges and stick it with adequate tape.
We heat the iron to the maximum and pecionamos of 5 to 10 minutes.
With this ready the clues are seen through the paper.
Step 4: Remove Paper
Immerse the plate in water. After a few minutes rub the paper until it is removed
NOTE: If the toner is lifted, the tracks are painted with a permanent marker.
Step 5: Revealed
Prepare the ferric chloride according to the indications of the bottle, immerse the plate in the ferric chloride and move gently until the exposed copper is removed.
Remove ferric chloride with a wooden stick.
wash the plate with water and dry with kitchen paper.
remove the toner with a tiner or with a fine sandpaper and clean with alcohol
check backlight to look for possible short circuits if they are removed with a cutter or screwdriver and check with a multimeter
Step 6: Solder Mask
Print or draw with permanent marker the pads in the acetate.
Put solder mask on the PCB and spread it on the PCB with a wooden stick or place a plastic sheet on the PCB.
Spread the ink with a card, place the acetate and a glass on top and press to scatter the solder mask.
expose the UV lamp or the sun for 5 to 10 minutes
Remove the plastic and clean with alcohol, acetone or thinner
Step 7: Drill and Solder
With a drill or mototool make the corresponding holes using the component template, you can use a backlight to check if holes are missing, remember to use proper bits for each component.
Insert the components starting with the components of lower height and bend the terminals outwards and weld, this is the order:
- Ceramic calacitores
- Electrolytic capacitors 10 uF
- CI TDA2002 AND TDA2003
- Electrolytic capacitors 470 uF
- Electrolytic capacitors 1000 uF
Step 8: Heat Dissipation
Take some aluminum profiles and cut them to the right size for the TDA2002 and 2003
They are drilled and silicone grease is placed to transfer the heat.
Step 9: Volume Control, Power Source and Inputs
materials are prepared and proceeded as in the previous PCB.
- the circuit is printed.
- Stick with tape tape.
- It is ironed.
- Soak in water.
- the paper is removed.
- the tracks are retouched.
- it is revealed with ferric chloride.
- the toner is removed.
- is cleaned with alcohol
Step 10: Cut and Solder Mask
It is cut with a cutter and a ruler.
Apply the solder mask with a wooden stick.
Place the plastic sheet and spread it with a card.
the masquerade of pads printed or with a permanent marker is placed.
It is exposed to UV light or the sun for 5 or 10 minutes.
the plastic is removed and cleaned with alcohol
Drill the corresponding holes and weld the components in the 3 PCBs as shown in the diagram
Step 12: Finish
We take the PCBs and solder them, starting with the power source then the volume control and the inputs. and then the horn contacts.
we put it in a casing. we connect speakers with 8 watts RMS or 80 Watts PMPO 4 ohms for the front, side and rear. the woofer 10 watts RMS or 100 watts PMPO 4 ohms. The center has 2 horns of 8 watts RMS 4 ohms in series and a twitter bullet of 1000 watts of 8 ohms. so you have a measurement of 4 ohms for maximum power.
This amplifier has a power of 60 Watts RMS or 600 PMPO or a little more.