MINI STEREO AMPLIFIER (TEA2025)

Tweet

This mini amplifier is based on the Thomson Type TEA2025. In this 16-pin DIL device hides a stereo amplifier that with a supply voltage of 9 V will provide 1watt output per channel into a 4-ohm loudspeaker. At full output, the input sensitivity is about 25 mVpp. If this is too sensitive, a resistor R may be connected between pin 6 and C7 and between pin 11and C2. The sensitivity then becomes (25+ Y2R) mV, provided R> 1k. Furthermore, the supply voltage may lie between 3 V and 12 V. The operation of the IC cannot be discussed here, but for those interested its internal circuit diagram is reproduced in Fig.

INTEGRATED STEREO AMPLIFIER

Tweet

The Type TDA1521 from Valvo/Mullard is an integrated HiFi stereo power amplifier designed for mains fed applications such as stereo TV. The device works optimally when fed from a ± 16V supply, and delivers a maximum output power of 2 x 12W into 8 ohm. The gain of the amplifiers is fixed internally at 30 dB with a spread of 0.2 dB to ensure optimum gain balance between the channels. A special feature of the chip is its built-in mute circuit, which

HI-FI HEADPHONE AMPLIFIER

Tweet

This l-watt amplifier lends itself par excellence for use as driver for a low impedance headphone or as output stage in a hi-fi preamplifier driving an active loudspeaker. Many preamplifiers do not permit long, unscreened leads to be connected to them, but the present amplifier accepts these happily.

The amplifier delivers a maximum power of 1 watt into 8 Q for an input signal of about 500 mVrms.