Every time, going to work in the morning, we try not to forget to turn off the apartment lights and appliances. Meanwhile, the function can be run machine consisting of three main blocks (Fig. 1): sensors, digital control unit and key. Here’s how it works.“BEFORE LEAVING, EXTINGUISH THE LIGHT!”
Every time, going to work in the morning, we try not to forget to turn off the apartment lights and appliances. Meanwhile, the function can be run machine consisting of three main blocks (Fig. 1): sensors, digital control unit and key. Here’s how it works.
The vast majority of household electrical appliances aren’t grounded. At first glance, it is not necessary: the chassis devices are securely isolated from the network, and work with them, usually in dry areas with non-conducting floors. But to rely entirely on technique impossible. If the breakdown or damage to insulation — faulty device becomes a source of serious danger. Fuses are useless: they will not burn out until there is a short circuit.
Bought seedlings of two tree-eight-year. Roots are naked without earth. If it sticks? Put all the rules of farming. One soon began to show signs of life and the other is not. I waited two weeks. No movement of the kidneys. I decided to help her stimulation. Brought to the garden plot regulated power supply, multimeter. Plunged to the root of the tree a metal pin with a length of 400 mm (minus). The top of the tree connected to the power supply using the crocodile (“plus”). Turned on the power supply and gradually began to raise the current, but it is more 3 ua did not increase it was Thought that the venture won’t work.
To build and repair electronic equipment needs generators low and high frequencies. A simple device, a scheme which offers the British magazine “Radio Electronics Constructor”, replace them at first. The single junction transistor V1 performs the functions of the relaxer. The value of resistor R1 and capacitor C1 determine the value of the audio frequency (about 1 kHz). It change the selection of capacitor C1. Using an isolating capacitor C3 of the low-frequency signal is supplied to the output socket. And since it has a sawtooth form, that contains a large number of higher harmonics.
DEVICE FOR CHARGING BATTERIES is a rectifier device with electronic current regulator (Fig. 1). A rectifier manufactured by bridge circuit of diodes V1 — V4 (Fig. 2), and the electronic controller a current amplifier transistor V5. The necessary adjustment select using the divider resistors R2, RZ, providing current from 4 to 6 And at a voltage of 8-15 V.
When the firebox of the fireplace or stoves in the country wood raw material to the combustion process from time to time it is necessary to control: throw the wood, increase craving, etc. to Replace “master’s eye” and recall this can offer an electronic device indicating the reducing flame in the furnace (the furnace).
In the process of operation acid batteries gradually sulfation of the plates which reduce capacity and shorten the life of the device. To eliminate this undesirable phenomenon, a special rectifier. The device is intended for use in stationary and field of auto repair shops. Collect it, you the driver with basic knowledge in electrical and electronics.
Flashing beacons are used in electronic home security systems and in cars as devices of indication, alarm and warning. Moreover, their appearance and “stuffing” are often not distinguished from beacons (special signals) emergency and operational services.