Calculation of AC phase inverter on a programmable calculator "Electronics B3-34". Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Speakers
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A phase inverter with a head installed in it can be represented with some simplifications as an acoustic high-pass filter (HPF). Its calculation is rather complicated, since it requires taking into account a large number of parameters that ensure the best uniformity of the frequency response of the loudspeaker.
For the calculation, it is necessary to measure the displacement (sag) of the voice coil of the head D (in millimeters) under the action of a load of non-magnetic material weighing M = 0,2 ... 0,4 kg, placed on the diffuser at the place of its connection with the coil. This is done using a strip of H1 scale-coordinate paper ("graph paper"), marking the removal of any mark on the diffuser from the ruler placed on the diffuser holder. The diffuser displacement should be measured with great care, since it usually does not exceed 1 ... 2 mm (for example, the diffuser of the 8GD-1RRZ head is displaced by only 0.2 mm under the action of a load of 1 kg). Then they find the flexibility of the moving system Сг=10(-4)/DM (in meters per newton), the volume of the phase inverter box V=0,875СяD(4)eff (in liters), where Ся is the flexibility of the air in the box, equal to 0,7, 0,76Cr. (in meters per newton), and Deff is the effective diameter of the diffuser (in centimeters), equal to 0,82 ... 4Dnom. The passage length L is found from the ratio (3,4L + 2d) / d2 = = ЗU2d4 / 1лVfo. where L and d are, respectively, the length and diameter of the phase inverter tunnel (in meters), V is the volume of the box (in cubic meters), fo is the resonant frequency of the head (in hertz). When choosing the length L (Fig. 40), it should be borne in mind that the distance from the end of the tunnel to the rear wall of the box must be at least 0,1 mm, and the length L itself must not exceed 3400 wavelength corresponding to the resonant frequency fo of the head, t i.e. it is necessary to fulfill the condition: L(mm)<XNUMX/fo (Hz). If the estimated length of the passage is too large, a smaller diameter is given so that the above conditions are met.
When calculating on a microcalculator, first program 1 is written into it, then the initial data are entered into the registers P1, P2, R4, P5 and P6: mass of the load M (in kilograms), coil mixing D (mm), diffuser diameter Dnom (cm), diameter passage d (mm) and resonant frequency fo (Hz). After that, they press the V / O and C / P keys and after a few seconds the passage length is read from the calculator display, and the phase inverter volume in liters is extracted from register PXNUMX.
Example. Calculate the phase inverter. in which a 4GD-35 head is installed with a diffuser diameter Dnom=20cm and a resonant frequency fо=65Hz. A load weighing 0,2 kg causes a displacement of the voice coil by a distance D = 1,5 mm. We select the diameter of the passage d equal to 0,05 m. Having written the program into the calculator, we enter the initial data into the memory registers: 0.2P1, 1.5P2, 20P3, 0.05P4, 65P5. Then we press the keys В/О and С/П and, having waited for the calculation to stop, we read the length of the passage on the scoreboard: L=6.6x10-2 m. We check the condition: L<3400/fo. If the display shows the combination "YEGGOG" (error). then the condition is not met and it is necessary to reduce the diameter of the passage, but if a certain number is obtained, then the condition is met. We press the C / P key - the number 52,3 on the scoreboard, which means that the condition is met. From the IP6 register we extract the volume of the phase inverter V = 13 liters.
Literature
- Radio No. 5 1987
Publication: N. Bolshakov, rf.atnn.ru
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