16 ส.ค. Circuito Amplificador Watts usando TDA Circuito Diagrama de un Mini amplificador de sonido casero, yo los probe con unas bocinas de estereo desde hace 2 años y hasta ahora me ha rendido bien. amplificador TDA Visit. amplificador TDA amplificador tdam 8 pines Diy Electronics, Electronics Projects, Audio Amplifier, Speaker Design.

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Por lo tanto siempre hay que adoptar todas las medidas necesarias. CCoonnssttrruuccttiioonnaall PPrroojjeecctt C OMMERCIAL guitar amplifiers, even those intended for practising, tend to be fairly expensive and have many features such as gain and tone controls which are seldom used, while lacking more useful ones such as an extra input for a microphone or another guitar. Even a more ambitious version for driving a speaker providing an output of a few watts, which would be quite loud enough to annoy the neighbours or for playing amplificadorr a small hall, only requires the addition of a tea2030 power amplifier i.

EASY-BUILD Although the cost and fon of components required is small, audio power amplifier circuits do not lend themselves to a simple stripboard layout and the problems associated with designing and making a suitable printed circuit board are likely to put off all but the most tra2030 conscious or determined constructors. The simple project to be described here solves this problem and has been designed for easy construction with virtually no off-board wiring apart from the mains transformer, speaker and an optional headphone socket.

Parlantes Logitech Z506, dañados. Fuente averiada.

The finished circuit can be mounted in the same cabinet as the speaker these can be salvaged from a defunct hi-fi unit and even if a speaker has to be purchased separately it should not set you back very much. Many small commercial guitar amps often feature tone controls but these are really superfluous as most electric guitars have perfectly adequate tone controls fitted and so these have not been included in this design.

This device can supply up to 24W of audio power depending on the supply voltage and speaker impedance used, provided we are not too bothered about the distortion which in this application can almost be considered to be an advantage. With the lower supply voltage specified, a more reasonable output power would be about 6W to 10W which should be more than sufficient for our purpose.

The power output can be easily increased if required by reducing the speaker impedance or increasing the supply voltage, and no changes in the component values are required. It should, however, be remembered that the maximum supply voltage for both i. The TDA is a very well protected device featuring both short circuit and over dissipation protection although from a reliability point of view it is certainly not advisable to run the device in either of these conditions. Music generally tends to have many peaks while the average power dissipated remains low so that in practice, despite the use of the relatively small heatsink specified, the temperature of the device will remain well within its safe limit even with prolonged loud playing.

Also, as the circuit is permanently connected to the speaker except when in headphone mode the possibility of a short circuited output is much reduced. An optional output socket SK3 is also wired in circuit to enable headphones to be connected in place of the speaker LS1.

This is arranged so that inserting the headphone jack plug automatically disconnects the speaker. It also switches in a resistor, R11, in series with the headphones to prevent overloading, see Fig. Both the resistor and the headphone socket are mounted off the board and it will be noticed that the headphones which normally have an impedance of 32 ohms each are connected in series.

It provides a d. The relatively low impedances in the circuit mean that hum and noise pick-up is low so that an l. D4 Power On indicator has been included to remind the user to switch off! With an electric guitar a microphone is required to avoid having to shout rather than sing. Many practice amplifiers however, have only one input and cannot easily accommodate a microphone but this deficiency has been rectified in this design by adding a simple mixer.

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The microphone element constitutes in effect a very high impedance source and a buffer amplifier consisting of a field effect transistor or f. A nominal 5V supply is derived from the main supply rail via resistor R1 and Zener diode D1 while R2 forms the load resistor for the f. The centre pin and the second terminal are connected inside the microphone. Complete circuit diagram for the Guitar Practice Amp.

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A 10 kilohms resistor was found amplifiador in the prototype but this may be changed if required, a higher value resulting in a lower gain and vice-versa. It does this by changing its output voltage when a change in the input voltage tries to upset this and as the feedback preset VR1 has a higher value than t h e i n p u t r e s i s t o r R4, the output voltage tda2300 is higher resulting in a voltage gain.

Another way to visualise this is to realise that an op. This means that the microphone channel will not be affected by any changes in the volume or tone settings of the guitar which is also connected to this point via its own resistor R1.

The values of the resistors would, of course, have to be chosen carefully to avoid over driving the amplifier. The output of a CD player for example would be much larger than that of a guitar so that its resistor would need to have a higher value. Alternatively, each channel could have a separate volume control fitted as shown.

It would also be a good idea to fit d. No separate provision for ampoificador the volume of the microphone channel has been made in this version as the relative volume of the guitar can be controlled at the instrument itself while VR2 controls the overall volume.

The use of a printed circuit board p. VR2 10k rotary carbon, log. Assembly of the board should begin by inserting the terminal pins which will be used to connect the speaker and transformer xmplificador the p. These usually require a certain amount of force to insert into the board which could damage adjacent components if this were done at a later stage. Once the solder pins have been fitted, the board may be completed by mounting resistors, diodes, capacitors etc.

Care should, of course, be taken to ensure that diodes and electrolytic capacitors are inserted the correct way around. Note also that a wire link made from a discarded component lead and a resistor R10 are mounted under C12 and C13 so that these components must obviously be fitted before the electrolytic capacitors are mounted on the board.

A second wire link is also required between C6 and VR2. In the prototype this was made from a piece of L-shaped aluminium extrusion normally sold in DIY shops but should this not be easily obtainable a suitable piece of sheet aluminium bent to shape and drilled as shown will do just as well. IC2 should be mounted on the board but its leads should not be soldered for the moment.

Once this has been done, the heatsink can also be mounted on the board and secured to it using two nuts and bolts. Heatsink dimensions and bending details.

Printed circuit board component layout, wiring and full-size copper foil master. The wiring to the microphone insert jack plug PL2 is shown inset below. Once IC2 is secured to the heatsink, its leads can be soldered and trimmed in the normal way.

Note that it may also be necessary to bend the leads slightly to enable it to fit the holes in the board, see Fig. Most devices are supplied with the leads already pre-formed although it should be noted that the TDA is available with the leads formed for both v e r t anplificador c a l and horiz o n t a l mounting.


Both types are identical but the vertical device is to be preferred as quite a lot of lead bending would be required to fit the horizontal device. What is important however is to ensure that there is a good electrical path between the tab and the negative supply p. For this reason no mica washers or any other insulation should be fitted between the tab of IC2 and the heatsink. The heatsink is used as a negative supply connection to the chip and it must not be earthed or connected to any other part of the circuit.

The pinout details of the TDA are shown in Fig. The only other component worthy of individual mention is the bridge rectifier where a 2A device is specified.

These are available in many amploficador and shapes and although any of these devices will do, the board has been designed for an in-line package and so this type should be purchased if possible to avoid a lot of lead bending.

The transformer used in the prototype had wire leads but if another type is used, then wires may need to be fitted. Printed circuit board mounting types should be avoided as these usually lack mounting brackets and in this case the transformer will need to be mounted on a chassis or in the wooden cabinet containing the speaker. The final von will depend to a large extent amplificadoor circumstances and is therefore left to the individual to solve.

Care should be taken to ensure that a ttda2030 with a tds2030 tapped secondary or with two secondary windings which can be connected in series is used and although a voltage of 9V-0V-9V is specified, a slightly higher output could also be used.

It should be remembered that the output of a transformer is always quoted as an r. After rectification and smoothing the final d. The supply voltage should, therefore, be measured to ensure that it does not exceed the ratings of the i.

The centre tap of the secondary must be connected tdx2030 the 0V rail corner terminal of the p. The speaker will also need to be amplificcador to the output terminals using suitable lengths of wire.

If a socket for headphones is to be included, this should be arranged to disconnect the speaker when the jack plug is inserted so that a switched socket will be required see Fig. It should be cn supported by the potentiometer spindle and the input jack sockets but the final details of this are left to the constructor and will depend to a large extent on the cabinet in which the p. The voltage across each of the two smoothing capacitors can be measured and this should be about 12V d. A slight hum or hiss may be audible from the speaker if the Volume control VR2 is turned up fully.

Turn down the volume and connect a guitar which should now be heard. The only adjustment to be made is to set the gain of the preamplifier stage IC1 and this should be done with the volume turned up to maximum on VR2 and the guitar.

Starting with preset VR1 turned fully clockwise the gain should be increased until distortion is heard when a string is played. An oscilloscope is useful here but not necessary as it is the final sound that is important and not the apparent purity of the output waveform.

If required, the headphones can be plugged in and, provided the wiring has been done correctly, this should switch off the speaker. Take it away Eric. Headphone jack plug PL3 wiring. The headphone jack socket SK3 contacts break when the plug is inserted, disconnecting the loudspeaker LS1.

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