Stroboscope for disco. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Stroboscope for disco. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands

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Along with the usual lighting design of a discotheque, the so-called strobe light can be used - a lighting device for obtaining a stroboscopic effect. Its essence is that when lighting, say, dancing in a darkened room with periodic bright flashes, the movements are observed not continuous, but as if consisting of separate, following one after the other, "frozen" positions.

The easiest way to get bright flashes is from a special IFC-120 flash lamp used in industrial photo flashes. It is included in the generator circuit (Fig. 1), made on the VS1 dinistor. An indispensable addition to a flash lamp is a high-voltage pulse transformer that feeds the ignition electrode.

Fig.1 (click to enlarge)

When mains voltage is applied to the device, capacitor C1 begins to charge. When the capacitor reaches a voltage equal to the turn-on voltage of the dinistor, a current pulse passes through the winding I of the transformer T1. The transformer is step-up, with a large transformation ratio (i.e., with a large ratio of turns of the secondary and primary windings), therefore, a high voltage pulse appears on winding II, and hence on the igniting electrode of the lamp. The lamp flashes, and the capacitor C1 is discharged through it. Then the process is repeated.

The flash frequency depends on the ratings of the parts R1, R2, C1. It can be smoothly adjusted with a variable resistor R2. The flash energy is determined by the capacitance of the capacitor C1, as well as the voltage to which it has time to charge. It, in turn, is limited by the turn-on voltage of the dinistor. If you need to increase the flash energy, it is enough to put a larger capacitor C2 and turn on the zener diode in series with the dinistor to the appropriate stabilization voltage. But the sum of the turn-on voltages of the dinistor and the stabilization of the zener diode should not exceed the rated voltage of the capacitor C1, otherwise the capacitor will fail.

Variable resistor R2 can be SPO-0,5 or SP-1, fixed resistors R1 and R3 - MLT-0,5. Capacitor C1 - type KE or other oxide, with a rated voltage of at least 200 V, C2 - paper, for example MBM. The transformer can be prepared from an industrial flash, but it can be made by yourself on a ring core of size K10x6x3 from M2000NM ferrite. Winding I should contain 4 turns of PELSHO 0,31 wire, covering the largest possible surface of the ring, winding II - 60 turns of PELSHO 0,1.

If the flashes are unstable or absent at all, try changing the polarity of turning on the leads of any of the transformer windings. After making sure that the stroboscope is stable, its parts are mounted in a housing made of insulating material, and a flash lamp is installed on top of the housing. To make the flashes brighter, and the light comes out in the form of a beam, you need to install a reflector behind the lamp, as is done in an industrial flash.

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TPL5110 - Nano Power Management Timer 01.08.2015

Texas Instruments introduced the TPL5110 and TPL5010 ultra-low power timers, which complement the existing TPL5000 and TPL5100 family of timers.

The TPL5110 is a timer with an integrated MOSFET driver designed to control an external switch and turn off the current load in battery-powered devices. With low own consumption, about 35 nA, using the driver built into the TPL5110, it is possible to turn off the load at specified time intervals and significantly reduce the current consumption of the system in sleep mode. Such a solution will be in demand in energy storage devices and wireless sensors, as it allows to relax the requirements for the capacity and dimensions of the batteries used.

The TPL5110 differs from the previously introduced TPL5000 and TPL5100 timers with an extended time interval and a smaller package. The time interval of the timer is set with an accuracy of about 1% using an external resistor in the range from 100 ms to 2 hours.

It is also worth noting the possibility of using the one-shot function, when the timer turns on the MOSFET only for the duration of a single cycle after the supply voltage is applied. The choice between single shot mode and periodic firing is done using an external pin (ONE_SHOT). When using the TPL5110, regardless of the operating mode, it remains possible to control the power switch yourself using the M_DRV pin.

The TPL5110 timer is available in a 23-pin SOT6 package and is designed to operate in the temperature range from -40 to 105°C.

Main characteristics

Supply voltage range: 1,8 to 5,5 V;
Ultra-low self-consumption current: 35 nA;
Programmable time interval: 100ms to 7200s;
Time interval setting accuracy: 1%;
Built-in external MOSFET driver;
Single vibrator mode;
Small package: SOT23-6 (3x3mm);
Possibility of forced inclusion of MOSFET;
Working temperature range: from -40 to 105°С.

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