Photo shooting from a laser pointer. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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The laser pointer and its use in various designs have already been described on the pages of the Radio magazine. Continuing this topic, I propose a description of the photo shooting range using the same laser pointer. This electronic shooting range consists of two units - a pistol and a target with a photo sensor.

The target is designed so that when a pointer beam hits it, a sound signal is heard. The target (Fig. 1) contains a photo sensor on a VT1 phototransistor, a waiting single shot on logic elements DD1.1, DD1.2, and a AF generator on elements DD1.3, DD1.4. In the initial state, the phototransistor is poorly lit, so its collector has a high logic level. The output of the waiting single vibrator (pin 3 DD1.1) is a low logic level, the AF generator is not working.

If you briefly illuminate the phototransistor with a laser beam of a pointer, a low logic level will appear on its collector, the waiting one-shot will work - for about 2 s, a high logic level will be present at its output (pin 3 DD1.1). The AF generator will turn on, and the BQ1 piezo emitter will begin to emit a sound signal indicating that it has hit the target. The device will then return to its original state.

The scheme of the gun is shown in fig. 2. It consists of a laser pointer A1, an integrated voltage regulator DA1, a storage capacitor C1, a trigger button SB1 and a battery GB1. In the initial state, the capacitor C1 is charged from the battery. When you press the SB1 button, it will connect to the input of the voltage regulator, as a result of which a 5 V supply voltage will be supplied to the laser pointer. It will emit light for a short period of time (fractions of a second) until the capacitor is discharged. If the light hits the target, a signal will sound.

After releasing the trigger button, the capacitor will charge again - the gun is ready to "shot". Resistor R1 limits the charging current of the capacitor. There is no special power switch in the gun, since almost no current is consumed from the battery in standby mode. Most of the target parts are placed on a printed circuit board (Fig. 3) made of one-sided foil fiberglass.

The version of the target design used by the author is shown in Fig. 4. To protect against external illumination, the phototransistor 4 is placed in a plastic opaque housing 1, which is used as a jar of film. Approximately in the middle there is a partition 2 made of frosted organic glass. To increase the sensitivity, you can install a reflective cone 3 from whatman paper. The case is attached to the board 5, on which the piezo emitter 6 is also located.

The design of the pistol is shown in Fig. 5. You will need a "dummy" case of suitable sizes for it. Inside it, a laser pointer 1 is installed in such a way that it "shoots" in full accordance with the sight of the gun. The pointer is pre-wrapped tightly with electrical tape so that the power button is pressed. A button 2 and a battery 3 are also installed in the case. Installation is carried out by a hinged method.

In the device, you can use, in addition to those indicated in the diagram, the K176LA7, K564LA7 microcircuit, the ZP-1 piezoelectric emitter; oxide capacitors - K50, K52, K53, the rest - KM-6, K10-17, any tuning resistor, constants - MLT, C2-33, switch - any type, button in the gun - self-returning. Setting up a pistol comes down to selecting a capacitor C1 of such a capacity in order to obtain the optimal duration of the shot.

In the target, resistor R1 sets the sensitivity at which it does not respond to external lighting. The target itself should be protected from direct sunlight and other light sources. The tone and volume of the sound signal can be set by selecting the capacitor C3 (roughly) and the resistor R3 (smoothly). The duration of the sound signal is set by selecting the capacitor C2 and the resistor R2.

Author: I. Nechaev, Kursk; Publication: cxem.net

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