TDA1518BQ PDF

Print Email This simple circuit drives DC motors with a maximum current of 1 A and can be built with readily available components. The output voltage is adjustable between 0 and 14 V and the polarity can be changed so that not only motor speed but also rotation direction can be adjusted by turning a knob. The circuit is also ideal as a controller for a DC model railway or small low-voltage hobby tool. Power for the circuit is supplied by a 18 V mains transformer rated at 1.

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Print Email This simple circuit drives DC motors with a maximum current of 1 A and can be built with readily available components. The output voltage is adjustable between 0 and 14 V and the polarity can be changed so that not only motor speed but also rotation direction can be adjusted by turning a knob. The circuit is also ideal as a controller for a DC model railway or small low-voltage hobby tool.

Power for the circuit is supplied by a 18 V mains transformer rated at 1. For increased current limit the mains transfor-mer and diodes will need to be changed to cope with the extra current as well as the four transistors used in the bridge configuration. Motor speed control and direc-tion is controlled by a twin-ganged linear pot P1. Wiring to the track ends are reversed so that as the pot is turned the output voltage of one potential divider increases while the other decreases and vice versa.

In the midway position both dividers are at the same voltage so there is no potential difference and the motor is stationary. As the pot is rotated the potential difference across the motor increases and it runs faster. The vol-tage drop across D5 and D6 is equal to the forward voltage drop VBE of the bridge transistors and ensures that the motor does not oscillate in the off position with the pot at its mid point.

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Электронные средства наблюдения и контрнаблюдения Простой стереоусилитель Сейчас очень распространена портативная цифровая аудиотехника,работающая на миниатюрные головные телефоны. Но для этого нужен стереоусилитель с акустическими системами, небольшой по размерам и по цене, такой которым можно пользоваться на даче, в комнате общежития. В общем, аппарат, позволяющий достаточно качественно воспроизводить аудиосигнал, и при этом не является объектом воровства. На рисунке показана принципиальная схема стереоусилителя, развивающего по 12W на канал при относительно хорошем качестве звука.

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