Circuit electrinic

This audio amplifier project is a class AB audio power amplifier using a TDA2003 module power amplifier.It is simple to construct and has only a few outside parts. The module is designed with short circuit and thermal protection. It can drive lots as low as one.6 ohm and can delivering-over ten watts from a 16 V DC power supply. Figure one shows the TDA 2003 packaged and pin configuration.

The power supply ought to be well filtered to reduce mains hum, the on board capacitors alone are not adequate for this purpose but are necessary to make sure stability. Additional filtering is unnecessary if operating from a battery. If boards are used for stereo, you will need to double the size of the power supply.

The power supply necessary for is 8 - 18V DC at one Amp or more. Maximum output power will only be obtained with a power supply of greater than 1A at 16V DC, and using two ohm speakers (or two by four ohm speakers in parallel). However about 4W RMS can be obtained with a 12V DC, 1A supply in to a four ohm load.

The major circuitry is contained in the amplifier module. C1 is the-input coupling capacitor & blocks DC signal, so does C3 which is the output coupling capacitor, & C2which blocks DC from the feed back loop to the differential input. R2 & R3 set the level of feedback. C4 & R4 provide a high frequency load for stability where loudspeaker inductive reactant may become excessive. C5 & C6 provide power supply  filtering.

There ought to be no issues with the stability of the circuit, however in the event you do, make definite the power-supply filtering and leads are adequate. If necessary you might connect an RC compensation network-between IC pins two and four as in the knowledge sheet. Values for Cx of 22 - 33 nF and for Rx of 39 - 47 ohms,should be satisfactory whilst still maintaining satisfactory high frequency response.

The gain is equal to one + (R2/R3) = 101, or 40 dB, minus any input attenuation. You may reduce the-overall gain by increasing the worth of R3 in the event you are only able to make use of part of the potentiometer range as a volume control. For example, an R3 of ten ohms will give a gain of 23 (27dB).