# CONDENSER FLASHLIGHT

In the memorable 1990-e years I worked at the Kirov plant instrument maintenance computer. Every morning we had to go down to the basement to enable refrigeration. Bulbs in the basement then disappeared, burned out. In short, as a rule, to see the switch, had to use matches: even to buy a flashlight for the plant was the problem. Then appeared the idea to make such a lamp yourself. From the power supply batteries and battery items I refused: they often fail, leak or anything. I did almost “eternal” condenser flashlight.

As a source of energy is used the capacitor C1 of large capacity (150 000,0 мкФх16 In) produced by ELKO. The amount of energy a capacitor is 15 joules (j). Charging is via dneproprudnyi the rectifier VD (Teal КД105) from the AC charging voltage. At the same time it serves to protect from improper supply voltage. Charging of the capacitor is controlled by the HL1 light bulb (6.3 V, 0.3 A). Its gradual extinction means the end of the process.

Using a resistor R1 (MLT-1; 33 Ohm) is limiting the charging current. To charge enough for 1.5 — 2 minutes. It provides up to 250 pulsed flashes. The light source is a miniature light bulb HL2 type CMP 8-60-1. During nominal operation 8 60 mA it produces a luminous flux of 2.6 lumens (lm). But HL2 is running in a pulsed mode with the discharge of her small dosing of the capacitor C2 (470 UF) at a voltage of 16 V. Considering the short duration of the pulse (about 1.5 C), double the excess of the nominal voltage does not display a bulb out of action — life in this mode for about 2 years. Adopting luminous flux 5 1T, will receive the illumination at a distance of 1 m:
E=f/4L2=5/(4×3,14х12)=4 suites, where f is the luminous flux, L is the distance to the light source, m

Such illumination is consistent, for example, an emergency light and provides sufficient visibility on the stairs or in a small room with dimensions of 4×4 m.

A circuit diagram of a condenser flashlight

A circuit diagram of the charger from the mains 220V for condenser flashlight

The layout of the flashlight:

1—light НL2; 2 -socket connect to a charging source; 3—button blower SB; 4—handle; 5 — housing (bottles of 0.9 l from under the ketchup); 6—light НL1 charging control; 7—reflector (tin lid for canning)

The inclusion of the flashlight by pressing the switch button blower SB. When retention occurs, the metering discharge of the capacitor C2 on the light bulb НL2 to complete extinction. Releasing and again pressing the blower SB, we obtain the following light pulse. Continuous operation in this mode from one charge of the flashlight can last 6 — 7 minutes (250 pulses in 1.5 s).

It should be noted that the duration of flashlight on a single charge can be increased by several orders of magnitude, if we adapt to our design of the ultracapacitors manufactured by JSC ESMA (Troitsk). Their capacity provides a reserve of energy up to 6 kJ per 1 kg of weight. Thus, if instead of ЭLКО, which weighs 0.5 kg, the use of capacitor ESMA of such weight, the amount of energy(3000 j)increase the number of flashes approx 200 times. The duration of this charging can exceed 20 hours.

To connect the charging source DC or AC voltage spagat sockets X1 and x2. If charging has to produce from the mains, you should use a separately assembled device. When it first connects to the flashlight, and only after the utility voltage is 220 V.

A. SHEMYAKIN, G. K I R o V