SZ123 » Audio Diy http://www.sz123.com FM Transmitter Lovers Sun, 06 Jun 2010 09:57:03 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 TPA3121 Class-D Audio Power Amplifier http://www.sz123.com/tpa3121-class-d-audio-power-amplifier.html http://www.sz123.com/tpa3121-class-d-audio-power-amplifier.html#comments Fri, 05 Jun 2009 18:06:17 +0000 SZ123 http://www.sz123.com/tpa3121-class-d-audio-power-amplifier.html Description: 15-W Stereo Class-D Audio Power Amplifier with SE Outputs (TPA3121) 24-HTSSOP -40 to 85

tpa3121_2 tpa3121_1

Download DATASHEET

]]> http://www.sz123.com/tpa3121-class-d-audio-power-amplifier.html/feed 0 50 Watt Audio Amplifier (L8063) http://www.sz123.com/50-watt-audio-amplifier-l8063.html http://www.sz123.com/50-watt-audio-amplifier-l8063.html#comments Wed, 20 May 2009 08:40:10 +0000 SZ123 http://www.sz123.com/50-watt-audio-amplifier-l8063.html This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.

amp50w

Part
Total Qty.
Description
R1 1 200 Ohm 1/4 W Resistor
R2 1 200K 1/4 W Resistor
R3 1 30K 1/4 W Resistor
R5 1 1K 1/4 W Resistor
R6 1 5K 1/4 W Resistor
R7,R10 2 1 Meg (5%) 1/2 W Resistor
R8,R9 2 0.4 Ohm 5 W Resistor
R11 1 10K Pot
R12,R13 2 51K 1/4 W Resistor
R14 1 47K 1/4 W Resistor
C1 1 100uF 35V Electrolytic Capacitor
C2 1 0.011uF Capacitor
C3 1 3750pF Capacitor
C4,C6 2 1000pF Capacitor
C5,C7,C8 3 0.001uF Capacitor
C9 1 50pF Capacitor
C10 1 0.3uF Capacitor
C11,C12 2 10,000uF 50V Electrolytic Capacitor
U1,U2 2 741 Op Amp
U3 1 ICL8063 Audio Amp Transister Driver thingy
Q1 1 2N3055 NPN Power Transistor
Q2 1 2N3791 PNP Power Transistor
BR1 1 250 V 6 Amp Bridge Rectifier
T1 1 50V Center Tapped 5 Amp Transformer
S1 1 SPST 3 Amp Switch
S2 1 DPDT Switch
F1 1 2 Amp Fuse
SPKR1 1 8 Ohm 50W Speaker
MISC 1 Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

I know I skipped R4. That is not a problem :-)

Distortion is less than 0.1% up to 100HZ and increases to about 1% at 20kHz.

I haven't been able to find anyone who sells a suitable T1. You can always use two 24V 5A units in series. If you are building two amps (for stereo), then I would suggest using an old microwave transformer and rewinding it. Follow the instructions in the 12V To 120V Inverter, execpt wind 26 turns, twist a loop (center tap) and wind 26 more turns. That should work out to around 50 volts. You may need to add or remove turns depending on your transformer.

Q1 and Q2 will require heatsinks.

]]> http://www.sz123.com/50-watt-audio-amplifier-l8063.html/feed 0 Use TDA1554 build 22watt audio amplifier http://www.sz123.com/use-tda1554-build-22watt-audio-amplifier.html http://www.sz123.com/use-tda1554-build-22watt-audio-amplifier.html#comments Fri, 15 May 2009 18:23:33 +0000 SZ123 http://www.sz123.com/use-tda1554-build-22watt-audio-amplifier.html The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers.

Tda1554

Part
Total Qty.
Description
R1 1 39K 1/4 Watt Resistor
C1,C2 2 10uf 25V Electrolytic Capacitor
C3 1 100uf 25V Electrolytic Capacitor
C4 1 47uf 25V Electrolytic Capacitor
C5 1 0.1uf 25V Ceramic Capacitor
C6 1 2200uf 25V Electrolytic Capacitor
U1 1 TDA1554 Two Channel Audio Amp Chip
MISC 1 Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input), Wire, Board

The circuit works best with 4 ohm speakers, but 8 ohm units will do.

The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed.

The circuit operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat.

]]> http://www.sz123.com/use-tda1554-build-22watt-audio-amplifier.html/feed 0 LM383 8 Watt Audio Amp http://www.sz123.com/lm383-8-watt-audio-amp.html http://www.sz123.com/lm383-8-watt-audio-amp.html#comments Fri, 15 May 2009 18:17:24 +0000 SZ123 http://www.sz123.com/lm383-8-watt-audio-amp.html Here is the LM383 schematic for an 8 watt audio amp. Very easy to build a mini-audio power amplifier.

lm383

lm383_2

Part
Total Qty.
Description
Substitutions
C1 1 10uf Electrolytic Capacitor  
C2 1 470uf Electrolytic Capacitor  
C3 1 0.1uF Disc Capacitor  
C4 1 2200uf Electrolytic Capacitor 2200uF
R1 1 2.2 Ohm Resistor Anything Within 10%
R2 1 220 Ohm Resistor Anything Within 10%
IC1 1 LM383 8 Watt Amp IC ECG1232, TDA2002

  • IC1 MUST be installed on a heat sink.
  • C3 is for filtering and to prevent oscillation and should not be omitted.
  • The circuit can be built on a perf board, universal solder board or PC board, the PC board is preferred. I built the circuit on a perf board and had to add a low value inductor at the input to prevent oscillation.
  • The circuit draws about 880 ma at 12 V.
  • By swapping the values of R1 and R3, you can turn this amplifier into a guitar amp with no preamp required.
  • If you add a 0.2uF capaciitor in series with a 1 ohm resistor to the output you can prevent oscillation of the circuit under certain conditions.
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