The proposed German magazine “Funkamateur” light relay is activated when light falls on the photoresistor R1 (see diagram) — when this occurs, a loud siren sound. Transistors VT1, VT2 equivalent odnoimennogo of the transistor included under the circuit of the sawtooth generator. The oscillator frequency is determined by the capacitance of the capacitor C1, the internal resistance of the photoresistor R1 and the resistor R2. Transistors VT3, VT4 included in the Darlington circuit, perform the function of the AF amplifier. It is possible to replace. Photoresistor — any domestic; transistors: VT1 – КТ3107, KT361, КТ203; VT2, VT3 blocking – KT315, КТ312; VТ4 – КТ503, КТ603, КТ815 with any alphabetic indexes.
Talking about various musical instruments, it is impossible not to recall the, perhaps, popular and indispensable in modern orchestras and rock bands. Of course, this is the electric guitar.
When performing various jobs around the house was sometimes necessary to have on hand a source of electricity with lower than the normal network voltage. For example, to illuminate the water in the tank (to save the bulb from premature burnout of the filament), etc.
during the period covering the country’s public deficit even the most that neither is ordinary iron burst in a number of regions in the category of “trudnoreshaemyh”. And is — alas! — quite expensive. But for the resourceful craftsman to make the original iron, as they say, no problem. You only need to thoroughly want… unlike the hero of the once popular song where the words are in the title of this material, the success of saadeldin guaranteed.
Fun — fishing in open water. With the early spring as soon as the ice recedes, and until late fall the true fisherman whenever possible, in a hurry to the pond with the hope of a successful trophy. But it is not always possible to return home with their catch.
The proposed device is designed for automatic control of vibrionaceae Malysh, Rucheek and the like for operation in boreholes (wells) with a low flow rate of water or for periodic pumping of groundwater. Machine applied non-contact water level sensors, installed directly on the lifting hose of the pump, allowing it to be used in wells of small diameter.
As is known, operation at a higher supply voltage, the mode transition processes (with frequent switching on and off) are light bulbs guidelinesin follows: ultimately burns out the filament. Meanwhile, the lifespan of light bulbs can be considerably increased if you connect them to the AC mains via a special adapter, each of which — your… rectifier. Of course, compact: solid-state, half-wave rectified without filter.
Strobe and underlying his actions the same-name effect find application not only in discos, no matter how popular, attractive ones. And technology is no exception. How to make strobe lighting (based on a familiar to every photographer flash lamp IFK-120) and use it to adjust the system sariguney car, described in the following material.