SU29508A1 - Microphone switch - Google Patents

Description

The proposed invention consists of a constructive implementation of the device, which is supposed to activate the microphone by means of a rheostat and a potentiometer. ,

In FIG. 1 shows a device diagram; FIG. 2 is a curve of its resistance variation.

The microphone of the / W, L / microphones (Fig. 1) is connected to the primary winding circuit of the corresponding transformer T, the secondary winding of which is connected at one end to the pair and the other end to one of the potentiometer terminals L. The opposite clamp of each of the potentiometers 11 is connected

:; engine of the corresponding rheostat

R. P,

The rheostat and potentiometer engines are mechanically connected to each other, for example; ep, mounted on a common axis, so that when removing the potentiometer, the reduction of the internal resistance

224 .-:

- /, d; the device was compensated by the introduction of resistance to the rheostat.

If we denote the internal resistance of the transformer T by /, through R-soproto1: potentiometer pls / 7, through r-resistor r-resistance / - and finally through L-relative distance of the potentiometer slider from point D, then for device resistance (between, points A and C) we get the expression:

 (1st) - {--- R Л-гх

 L. /ABOUT .

, and g 0,5 RI

7 1 + 1,5-У -О.ОА: - „

we have: Zp - - y-y -: - i

i-j-l

The dependence determined by the last equation is shown in FIG. 2 at