electrical engineering: May 2007

Wednesday, May 30, 2007

TDA2004 Headphone amplifier

A opamp. medium power, here it�s used as amplifier of headphones with possibility drive low loads. It contains in a nutshell two amplifiers. The voltage gain, has been determined in 40dB, from the R3-4 and R11-12, for each channel, respectively. The restriction of bandwidth for each unit is regulated by the combination of R12, C2 and R13, C15, in 22KHZ. The R5, R10 attend to the adaptation of impedance earphones.

Link: TDA2004 Headphone amplifier

300W Power Amplifier OCL by transister

Source :: http://users.otenet.gr/~athsam/power_amp_300w.htm

For many application there's no substitute for sheer power- low efficiency speakers, outdoor sound systems, or maybe you like the full flavour of the dynamic range of a high power amp. Whatever your requirement-this super power module should fit the bill. How it works: The amplifier can be divided into three separate parts. These are : the input stage, which consists of Q1-Q9 , a high gain, low power driver; the output or power stage- witch only has a voltage gain of four but enormous power gain; and the power supply. The input stage is a complementary -differential network, each ''side'' with its own current source. Each transistor in this stage is run at a collector currant of about 0.7mA. Emitter resistors are employed to stabilize the gain and improve linearity. The output of Q1-Q5 drives Q7 and Q9. The latter are virtually two constant-current sources run about 7mA collector current. With an input signal these ''current'' sources are modulated out of phase - the collector current of one decreases while the other increases. This configuration provides quite an amount of gain. In between the bases of these two transistors is Q8, the thermal sensing-bias transistor. The voltage across Q8 may be adjusted by TR1, thus setting the quiescent bias current for output stage. The output stage, Q10-Q11, Q13-Q14 and Q16-17, has a gain of about five, set by R44 and R28 plus R29. Diodes D4 and D6 prevent reverse biasing of Q10 and Q11 (otherwise the output would be limited). Protection of the output transistors is provided by Q12 and Q15 which monitor both current and voltage in the output transistors and bypass the base current if the limit is exceeded. Frequency stabilization provided by capacitors C6, C11, C12 and the RC networks R31/C10 plus R46/C15. Frequency response of the amplifier is set by C1 and C7 (lower limit), C6 sets the upper frequency limit. If you want use the Protection DC and Balance/Bridge circuits. All the transistors that are inside the interrupted line are placed on an aluminium corner and he screwed on a suitable heatsink. The transistors Q7,Q10,Q11, Q8, Q9, Q13,Q14,Q16 and Q17 placed on this aluminium corner, with suitable isolation from this.

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300W Power Amplifier OCL by transister

Tuesday, May 29, 2007

circuit power amp OTL 100W by transistor 2N3055 (with PCB)

This is Circuit Power Amp OTL 100W by transistor 2N3055.
It easy to build because normal circuit power amp OTL.
To use power supply 98V 5A.
Out put power 100W at Speaker 8 OHM or 120W : 4OHM.

View circuit and PCB power amp OTL 100W by transistor 2N3055 (with PCB)
View Circuit Power Supply 98V 5A FOR power amp OTL 100W by transistor 2N3055

circuit power amp mosfet ocl 60W by K134 and J49

This is circuit power amp mosfet ocl 60W, it use mosfet K134 and J49.
Out put power 60W at speaker 8 ohm or 120W at 4 ohm.
It easy circuit.
supply volt +49V gnd +49V ,Curent 3-5A.

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Friday, May 25, 2007

Super Small Amp 1.2W by IC TDA7052

Pre MIC (microphone preamplifier) 3 CH by IC LM348

Circuit Pre MIC (microphone preamplifier) 3 CH by IC LM348

PCB Pre MIC (microphone preamplifier) 3 CH by IC LM348

Pre Tone Control Stereo by IC NE5532

Thursday, May 24, 2007

Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

Circuit Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

PCB Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353

Monday, May 14, 2007

5 Channels Graphic Equaliser by LA3600

This circuit 5 Channels 2 Octave Graphic Equaliser,easy to make equalizer,
because using IC LA3600 (easy to use)
Cut at frequencies of 50Hz, 200HZ,800Hz,3.2kHz and 10kHz.
Supply voltage may be anything from +12V.

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5 Channels Graphic Equaliser by LA3600

5 Channels 2 Octave Graphic Equaliser by 4558

This circuit 5 Channels 2 Octave Graphic Equaliser,easy to make equalizer,
because using IC 4558 or 1458 or LF353 (nice)
Cut at frequencies of 50Hz, 200HZ,800Hz,3.2kHz and 12kHz.
Supply voltage may be anything from -15V GND -15V for IC 4558.

View Circuit 5 Channels 2 Octave Graphic Equaliser by 4558 with PCB

Sunday, May 13, 2007

TDA2005 Amplifier Car audio BCL 20W

The Circuit TDA2005 Amplifier for Car audio BCL (ฺBride Amplifier) 20W.
Volt supply 11V to 14V, Power output 10W+10W#, for Speaker 2-8 ohm.

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TDA2005 Amplifier Car audio BCL 20W

TDA2004 Amplifier Car audio stereo OTL 10W+10W

The Circuit TDA2004 Amplifier Car audio stereo OTL 10W+10W.
Volt supply 11V to 14V, Power output 10W+10W#, for Speaker 2-8 ohm.

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TDA2004 Amplifier Car audio stereo OTL 10W+10W

TDA2006 Amplifier audio OTL 12W with single power supply

The Circuit TDA2006 Amplifier audio OTL 12W with single power supply.
Volt supply 11V to 14V, Power output 12W, for Speaker 2-8 ohm.

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TDA2006 Amplifier audio OTL 12W with single power supply

TDA2006 Amplifier audio OTL 12W

The Circuit TDA2006 Amplifier audio OTL 12W.
Volt supply 11V to 14V, Power output 12W, for Speaker 2-8 ohm.

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TDA2006 Amplifier Car audio OTL 12W

Saturday, May 12, 2007

TDA1910 monolithic integrated circuit.

The circuit TDA1910 monolithic integrated circuit.
* 10 dB 50Hz boost tone control using change of pin 1 resistane (muting fumction)

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TDA1910 monolithic integrated circuit.

TDA1910 Sqelch function in TV

The circuit TDA1910 Sqelch function in TV, INPUT Sound IF 5.5MHZ.

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TDA1910 Sqelch function in TV

TDA2003 Amplifier BCL (Low cost) 18W for CAR

The Circuit TDA2003 Amplifier BCL (bridge amplifier) 18W for CAR CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 18W, for Speaker 2-8 ohm.

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TDA2003 Amplifier BCL (low cost) 18W for CAR

TDA2003 Amplifier Car Audio OTL 10W

The Circuit TDA2003 Amplifier BCL 10W CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 8W, for Speaker 2-8 ohm.

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TDA2003 Amplifier Car Audio OTL 10W

TDA2003 Amplifier Car Audio OTL 10W

The Circuit TDA2003 Amplifier OTL 10W CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 8W, for Speaker 2-8 ohm.

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TDA2003 Amplifier Car Audio OTL 10W

Friday, May 11, 2007

TDA2002 Amplifier 8W CAR RADIO AUDIO

The Circuit TDA2002 Amplifier 8W CAR RADIO AUDIO.
Volt supply 10V-14V, Power output 8W, for Speaker 2-8 ohm.

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TDA2002 Amplifier 8W CAR RADIO AUDIO

TDA1910 Amplifier OTL 10W - with muting

The circuit TDA1910 Amplifier OTL 10W - without muting.
Volt supply 10V-14V, Power output 10W, for Speaker 2-8 ohm.

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TDA1910 Amplifier OTL 10W - with muting

TDA1910 Amplifier OTL 10W - without muting

The circuit TDA1910 Amplifier OTL 10W - without muting.
Volt supply 10V-14V, Power output 5W, for Speaker 2-8 ohm.

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circuit TDA1908 Amplifier CAR AUDIO OTL 8W

The circuit TDA1908 Amplifier CAR AUDIO OTL 8W.
Volt supply 10V-14V, Power output 5W, for Speaker 2-8 ohm.

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TDA1908 Amplifier CAR AUDIO OTL 8W

TDA1905 Amplifier CAR Audio OTL 5W

The circuit TDA1905 Amplifier CAR Audio OTL 5W.
Volt supply 7-14V, Power output 5W, for Speaker 2-8 ohm.

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TDA1905 Amplifier CAR Audio OTL 5W

TDA1904 Audio Amplifier OTL 4W

Wednesday, May 9, 2007

50W OCL Mosfet (K1058 + J162)

The 50W OCL Mosfet (K1058 + J162) is easy to build, and very inexpensive.
To use Power Supply +35V -35V >2A.
Mosfet (K1058 + J162) must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 50W OCL Mosfet (K1058 + J162)

40W Amp OCL 2N3055+MJ2955

The 40W Amp OCL 2N3055+MJ2955 is easy to build, and very inexpensive.
To use Power Supply +35V -35V >2A.
Transistor 2N3055+MJ2955 must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 40W Amp OCL 2N3055+MJ2955

35W Amplifier BCL by TDA2030

The 35W Amplifier BCL by TDA2030 is easy to build, and very inexpensive,Easy to build.
To use Power Supply +15V -15V >2A.
IC TDA2030 must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 35W Amplifier BCL by TDA2030

30W Amp OTL by TDA2030 +Transistor

The 30W Amp OTL by TDA2030 +Transistor is easy to build, and very inexpensive.
To use Power Supply 24V >2A.
IC TDA2030 and Transistor :BD908, BD907 must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

View Circuit and PCB 30W Amp OTL by TDA2030 +Transistor

Monday, May 7, 2007

VMOS 10 Watt Amplifier

Treble Booster By 741

TIP41+TIP42 Cassette Radio Booster

Telephone Amplifier by LF351+TBA820M

TDA2030 Genneral Purpose Amplifier

Simple Preamplifier by Transistor

Simple Amplifier by Transistor

Headphone Amplifier by Transistor

Class A Amplifier by Transistor

Cassette Preamp by transister

Active Tone Controls by Transistor

AC176+AC126 Power Amplifier

Thursday, May 3, 2007

5 Transister (C945) tone control mono.

This circuit Tone Control Mono, 4 Transister : C945 = 5 part.
Supply Volt min 12V 80ma.
Easy to build, PCB small.

circuit 5 Transister (C945) tone control mono.

PCB 5 Transister (C945) tone control mono.

4 Transister (C945) tone control mono.

This circuit Tone Control Mono, 4 Transister : C945 = 4 part.
Supply Volt min 12V 80ma.
Easy to build, PCB small.

circuit 4 Transister (C945) tone control mono.

PCB 4 Transister (C945) tone control mono.

3 Transister (C945) tone control mono.

This circuit Tone Control Mono, 3 Transister : C945 = 3 part.
Supply Volt min 12V <80mA .
Easy to build, PCB small.

Circuit 3 Transister (C945) tone control mono.

PCB 3 Transister (C945) tone control mono.

2 Transister (C945) tone control Stereo.

This circuit Tone Control Stereo, 2 Transister : C945 = 2 part.
Supply Volt min 12V <80mA .
Easy to build, PCB small.

Circuit 2 Transister (C945) tone control Stereo.

PCB 2 Transister (C945) tone control Stereo.

2 Transister (C945) tone control mono.

This circuit Tone Control Mono, 2 Transister : C945 = 2 part.
Supply Volt min 12V <50mA .
Easy to build, PCB small.

Circuit 2 Transister tone control mono.

PCB 2 Transister tone control mono.

Tone control circuits

Tone control circuits are electronic circuits used to modify an audio signal before it is fed to speakers, headphones or recording devices by way of an amplifier. They are akin to and sometimes called filters. In their most basic form, they elevate or attenuate the high and low frequencies of the signal. This is called treble or bass boost or cut, respectively, in the vernacular of audio engineering. More elaborate tone control circuits can elevate or attenuate the middle range of frequencies too. Really elaborate tone controls provide elevation or attenuation in 1/3 octave bands spanning from approximately 30 Hz to 18 kHz. These units are called graphic equalizers because their controls are in the form of sliders that are arranged so as to graphically display the amount of boost or cut being applied at any frequency of interest. The most elaborate units can control not only the boost and cut but also the frequency at which the boost and cut takes place and the bandwidth of the control's action. These are called parametric equalizers because they control all of the equalization parameters.

Read More : Tone control circuits

Wednesday, May 2, 2007

Pre MIC 3 Transister ( C945 ) mono

This circuit Dynamic Microphone Preamp,Pre MIC 3 Transister mono.
By Transister Part C945= 3 part.(TR1-TR3) OR C828 OR C458
Supply Volt 12V - 24V.
Easy to build and low cost.

Circuit Pre MIC - 3 Transister (C945) mono

PCB Pre MIC - 3 Transister (C945) mono

Pre MIC - 3 Transister (C945) mono

This circuit Dynamic Microphone Preamp,Pre MIC 3 Transister mono.
By Transister Part C945= 3 part.(TR1-TR3) OR C828 OR C458
Supply Volt 12V - 24V.
Easy to build and low cost.

Circuit Pre MIC - 3 Transister (C945) mono

PCB Pre MIC - 3 Transister (C945) mono

Tuesday, May 1, 2007

Pre MIC 2 Transister mono

This circuit Pre MIC 2 Transister mono.

By Transister Part C945.
Supply Volt 12V - 24V.
Easy to build and low cost.

View Circuit and PCB Pre MIC 2 Transister mono