Smd Headphone Amplifier

Although the use of SMDs (sur- face mount devices) is not yet widespread among electronics hobbyists, and the availability of these parts is still problematic in certain areas, there appears to be no way of stopping the ever increasing miniaturization of chips and circuits. A good instance of this happening at an accelerating pace is the Type TDA7050 headphone amplifier, which used to be available in a standard DIL enclosure, but is currently only manufactured in SMA technology. The Type TDA7050 is a com- plete stereo amplifier with a gain of 26 dB and an output power of 2 x 75 mW. As seen in the circuit diagram, two electro- lytic capacitors are required to block the offset voltage at the amplifier outputs. It is also poss- ible to set up the amplifier in a bridge configuration to obtain an output power of 150 mW: simply omit the capacitors, and connect pins 2 and 4 to ground. Pins 1 and 3 are connected to form the amplifier"s input, while the loudspeaker is connected Al, A2 = IC...