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The 60 Hz inverter shown below is about as simple to make and as inexpensive as one could desire. Yes, it is capable of providing some very useful services. Operating from an automobile battery, it can supply 50 W for the operation of such devices as an ac-dc radio, electric shaver, fluorescent lamp, small soldering iron, 40 W incandescent lamp, recorder, or portable phonograph. Its essential ingredients are a filament transformer and two general-purpose germanium power transistors. Although this is a saturable-core oscillator, no separate feedback windings are employed. Rather, feedback is produced by cross-coupled connections in the manner of a multivibrator. At a full load, the efficiency is in the vicinity of 75 percent, and the output voltage is about 106 V. The "mild" pi-section filter despikes the output waveform and causes a trapezoid wave, rather than the usual square wave, to be available at the output. This makes the device more suitable for the operation of radios...

There are some hopes that the sun will become a main source of energy in the 21st century. By then, sources of oil will be almost exhausted and will only play a minor part in the supplying of energy. Interested to know how to make a simple solar tracker with dual axis? Learn More The present interest in solar energy is therefore not surprising. Some work has already been done with solar cells and solar panels . However, these only operate with optimum performance when positioned exactly at right- angles to the sun. Unfortunately, this situation is not usual in our latitudes unless the solar panels are rotated with respect to the sun. The efficiency of a solar panel system can be improved if the panels track the sun, and remain as long as possible at the most favorable angle of incidence.  The circuitry required is relatively simple. lt uses a window comparator which keeps the drive motor idle, as long as the two LDrs are subjected to the same illumination. Half the operating v...

Make a series letters from the LED , Things to consider before making the sign of the LED array, 1) Use LED nodes. 2) Paint the top of the PCB with a dark color (black). 3) Note the LED specifications. In this experiment use a 5mm diameter LED nodes that emit red, specification voltage of 3 volts. The assembly of LED: 1) One letter composed at most 5 columns and 7 rows. 2) One column mostly composed by 6 LEDs are arranged series. 3) Then the fifth column are connected in parallel. 4) Each column given the constraints, Rx, which amount depends on the number of LEDs in one column and depends also on the type of LED (in this experiment that used LED 5mm in diameter, clear with red light beam). 5) In a column consisting of 6 LEDs, Rx = 330 ohm, 5 LEDs, Rx = 560 Ohms, 4 LEDs, Rx = 680 Ohms Remember, this provision applies to 5 mm LED red light beam nodes. 6) Every letter was given FCS9013 transistor amplifier. Here is one letter LED scheme. Medium picture below is the lay out of the 2-lette...