Power amplifier on the TDA7050 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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The DA7050 microcircuit - excellent frequency characteristics, reverse polarity protection, low supply voltage and current consumption, absolute unpretentiousness in operation - is a godsend for developers of portable radio equipment.
Ris.1,2
Specifications of power amplifiers on TDA7050:
- Rated output power.......2х75 mW, 150 mW in bridge connection
- The coefficient of non-linear distortion is not more than ....... 10%
- Input impedance......2 mOm
- Load impedance......32 ohm per stereo channel, 64 ohm bridged
- Current consumption ....... no more than 6mA
- Supply voltage ....... 1,8-6V
The top circuit is for stereo signal amplification. Modern stereo headphones are connected as a load. The bridging of the microcircuit (Fig. 2) allows you to get 150 mW at the output, which makes it possible to connect a small speaker. If its resistance is less than indicated in the diagram, connect a resistor in series, the total resistance of the speaker and the resistor should be 64Om. Otherwise there will be big distortions. Resistors R1 and R4 adjust the volume. The topmost circuit uses a dual variable resistor to control the volume.
Ris.3
Most stereo telephones greatly attenuate low audio frequencies when playing signals. To compensate for this shortcoming, many companies introduce Bass Boost systems into their products. For those who want to use this improvement to improve sound quality, here is a schematic diagram of a simple passive Bass Boost (Fig. 3).
For each channel, assemble one such device and connect to pins 2 and 3 of the microcircuit. Resistor R1 controls the volume, switch S1 - on / off Bass Boost (off in the diagram). Set the switch so that the effect is turned on / off simultaneously for two stereo channels.
See other articles Section Transistor power amplifiers.
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