Book Shelve Stereo Amplifiers - DIY
by profpat in Circuits > Computers
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Book Shelve Stereo Amplifiers - DIY
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Hi there fellow Instructablers!
I made this mini stereo amplifier for my son, it is powered by a used laptop 19V 3.43A adapter-charger. the audio source is his laptop headphone output. This amplifier will drive two bookshelf speakers. The heart of this circuit are two TDA2003 audio amplifier costing around $ 1.5 for a pair here in the Philippines. Overall cost is around $10.00 not including the laptop ac adapter and book shelf speakers. The input from the audio source is wired to a dual gang 10K volume control. Pin 1 of the volume control (variable Potetionmeter) is wired to ground, Pin 2 is wired to the input of the amplifier, and Pin 3 is wire to the rca jack. total output power is 20 watts.
Circuit Schematic Diagram
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here is the tda 2003 schematic diagram make two of this circuit for stereo or dual channel!
parts list :
- 2 pcs. TDA2003 integrated circuit amplifier
- 1 pc. 10 k Ohm stereo volume control
- 1 pc. plastic knob for the volume control
- 1 pc. perforated pcb
- 1 pc. suitable plastic casing
- 1 pc. aluminum heat sink fins
- 1 pc. dual rca jack
- 1 pc. mini stereo jack
- 1 pc. dual speaker terminals
- 1 pc. crown dc jack (adapter input)
- 1 meter soldering lead 0.8 mm 60/40
- 4 pcs. 1/4 plastic stand or double mounting tape
- 2 pcs. 39 nf ceramic capacitors
- 4 pcs. 100 nf ceramic capacitors
- 2 pcs. 10uf 25v electrolytic capacitors
- 2 pcs. 100uf 25V electrolytic capacitors
- 2 pcs. 470uf 25V electrolytic capacitors
- 2 pcs. 1000uf 25V electrolytic capacitors
- 2 pcs. 39 ohms 1/2 watt resistors
- 2 pcs. 2.2 ohms 1/2 watt resistors
- 2 pcs. 220 ohms 1/2 watt resistors
- 2 pcs. 1 ohm 1/2 watt resistors
Tools Needed or Required!
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tools
- soldering iron
- long nose pliers
- side cutter pliers
- electric drill and drill bits
- screw driver set
Assemble the Circuit Board!
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using the perfboard or proto board, mount all the components as in the pictures, and solder junction and connectors under and over the perfboard or proto board.
Make the Casing!
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with your suitable plastic casing, drill out for mounting the hardware. use masking tape for the pencil marks.
Install the Circuit Board Inside the Casing!
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After drilling holes for the hardware, install the circuit board and assemble everything in place!
Your Finished Book Shelf Stereo Amplifier
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Here some photos of different views of the amplifier!
Amplifier in Use, With My Ipod and Radio Shack Book Speakers
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Here, i am testing the amplifier using my ipod and two radio shack book shelf speakers. my power supply came from my old laptop. It is a 220Volts AC to 19Volts DC 4Amperes brick adapter.