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TCA5500 Stereo Audio Preamplifier. Tone Control

2016-04-17 15:06  
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Circuit diagram
TCA5500 Stereo Audio Preamplifier circuits
TCA5500 Stereo Audio Preamplifier. Tone Control circuit

General Description
In every sound system there is an indispensable stage which is the tone control. It is impossible to imagine a preamplifier, a mixer or an integrated amplifier without some means of controlling the frequency response of the system, i.e. With out TONE CONTROLS. This is because very rarely the conditions are ideal, and it is always necessary to make some adjustments, in order to achieve the best reproduction, no matter how good the system is. The circuit has been designed as an active TONE CONTROL stage based on a IC CIRCUIT. It can be used with any amplifier and despite its apparent simplicity its performance will surprise you.


First of all let us consider a few basics in building electronic circuits on a printed circuit board. The board is made of a thin insulating material clad with a thin layer of conductive copper that is shaped in such a way as to form the necessary conductors between the various components of the circuit. The use of a properly designed printed circuit board is very desirable as it speeds construction up considerably and reduces the possibility of making errors. To protect the board during storage from oxidation and assure it gets to you in perfect condition the copper is tinned during manufacturing and covered with a special varnish that protects it from getting oxidised and also makes soldering easier. Soldering the components to the board is the only way to build your circuit and from the way you do it depends greatly your success or failure. This work is not very difficult and if you stick to a few rules you should have no problems. Soldering the data in the table is the only way to build your circuit and from the way you do this depends largely on your success or failure. The soldering iron that you use must be light and its power should not exceed the 25 Watts. The tip should be fine and must be kept clean at all times. For this purpose come very handy specially made sponges that are kept wet and from which you can wipe the hot tip on them to remove all the residues that tend to accumulate on it. When you finish your work, cut off the excess of the component leads and clean the board thoroughly with a suitable solvent to remove all flux residues that may still remain on it. Although the printed circuit at a first glance seems to be too crowded and complicated, this is a simple project and you shouldn’t have any problems in building the circuit. Start off with the least sensitive components and gradually build your circuit so that you place and solder the IC in the very last stage of construction in order to avoid overheating them while you are soldering other components on the board. So, first of all solder the pins, then place the resistors, continue with the capacitors - paying particular attention to the polarity of the electrolytic - and finally, after checking that everything is OK , solder in place the two IC. The potentiometers can be either soldered directly to the printed circuit board, or alternatively, they can be connected to the board with shielded cable, to avoid picking hum and other interference. The way of mounting the potentiometers will be dictated by the avail ability of space in the box in which you are going to house your preamplifier, as well as from your particular preferences for the design of the front panel of the case. (If you solder the potentiometers directly on the P.C.B. then the distances between the potentiometers on the front panel should be exactly as they are on the board). As the circuit is for use in STEREO amplifiers everything is duplicated and there are quite a few connections to be made. All the signal carrying cables must be shielded to protect the circuit from unwanted interference which will degrade its performance. When all the connections have been made, clean the board thoroughly and inspect the circuit and its external connections for mistakes. If everything seems to be all right power everything up, and with a known piece of music bring the TONE CONTROLS to the desired position for the most pleasing effect.

TCA5500 Stereo Audio Preamplifier PARTS
TCA5500 Stereo Audio Preamplifier. Tone Control Parts

If they are used as part of a larger assembly any damage is caused, our company bears no responsibility. While using electrical parts, handle power supply and equipment with great care, following safety standards as described by international specs and regulations.

If it does not work
Check your work for possible dry joints, bridges across adjacent tracks or soldering flux residues that usually cause problems. Check again all the external connections to and from the circuit to see if there is a
mistake there. See that there are no components missing or inserted in the wrong places. Make sure that all the polarised components have been soldered the right way round. Make sure that the supply has the correct voltage and is connected the right way round to your circuit. Check your project for faulty or damaged components. TCA5500 Stereo Audio Preamplifier PCB
TCA5500 Stereo Audio Preamplifier. Tone Control PCB
Technical Specifications – Characteristics

Supply voltage DC: .............. 12 - 18 VDC
Supply voltage AC: .............. 12 - 15 VAC
BASS adjustment:..........15 dB
TREBLE adjustment:...... 15 dB Input impedance: .............100 K
Input sensitivity: ........ 100 mV – 0,5 V
Output level: ...............0.5 - 2 V
Frequency response:.....10 - 25,000 Hz
Distortion: ........................ 0.1 % (maximum)
Besides that the circuit offers the following features to you:
- Low cost.
- Simple construction which guarantees your success.
- Reliability and good performance.
- Independent adjustment of BASS and TREBLE
- Low distortion even if the input is overloaded.

Parts List

R1, R2, R3, R4 = 100K 1/4 Watt C1, C8, C17, C18 = 100nF C2, C9 = 10mF 22Volt C3, C4, C5, C6 = 220nF C7, C16 = 100mF 22Volt C10, C11, C12, C15 = 4,7mF 22Volt C13, C14 = 47nF C19 = 2200mF 33Volt IC1 = TCA5500 IC2 = 7812 P1, P2, P3, P4 = 100K BR = Bridge Rectifier 100Volt 4A AC = 10 – 12Volt TRANSFORMER OR DC = 12 – 15 Volt.

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