Low power amplifiers with electronic control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Low power amplifiers with electronic control. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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I have already mentioned that there is a certain European commercial organization called Philips. She produces all sorts of funny microcircuits, and we'll talk about two of them now.

The first one is TDA8551. The microcircuit is a bridge amplifier with an output power of 1 watt at a supply voltage of 5V. At the same time, the current consumption in silent mode is only 10 mA. The chip is made in an 8-pin package and does not require a heatsink, which allows it to be used in various small-sized devices. The microcircuit is equipped with protection against overheating, has an internal load connection delay circuit - so when you turn it on, you will not hear wheezing, farts and other wonderful music of transients.

Well, one more good thing that this microcircuit was equipped with is electronic volume control. However, what am I all in words, but in words - we look at the diagram.

Low power amplifiers with electronic control. Amplifier circuit

Such a modest circuit, requiring mainly shunt capacitors, and then in an amount that a cat can cry without straining at all. Buttons S1 and S2 adjust the volume, switch SW1 - the operating mode of the amplifier. I must say that the selected volume level is maintained until the power is physically removed from the microcircuit. From the STANDBY mode, it will exit with the volume with which you left it before entering this mode. If, however, to tear off the power completely, then on the next power-up, the microcircuit starts with the position of the volume control corresponding to the gain level of -20dB. A plate with elements ... although, there are elements here ...

Designation in the diagram	Nominal
C1	100uFx10V
C2	0,33
C3	0,1
C4	0,1
C5	200uFx10V

R1	2,2kOhm

DA1	TDA8551

The second chip is actually a double copy of the previous one. It - TDA8552. One package of this chip contains two identical amplifiers. The only difference is a slightly higher output power - 1,4 watts per channel. But, nevertheless, it also does not require a radiator and can be used anywhere. The switching scheme is as follows.

Low power amplifiers with electronic control. Amplifier circuit (one more)

This microcircuit has one more difference - the presence of output number 4. This output allows you to control the connection of headphones (of course, when using the correct connector) and automatically reduce the output power and the current consumed from the power source. But, I didn’t draw it on the diagram - I’ll send you to the datasheet, otherwise you will become completely lazy.

Designation in the diagram	Nominal
C1	0,33
C2	0,33
C3	0,1
C4	0,1
C5	220uFx10V
C6	220uFx10V
C7	220uFx10V
C8	220uFx10V
C9	0,1
R1	2,2kOhm
R2	2,2kOhm
R3	1kOhm
R4	1kOhm
DA1	TDA8552

Publication: radiokot.ru

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