Refinement of the Ts215 indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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The Ts215 indicator was widely used in various household equipment, for example, autotransformers, to control the mains voltage. Its basis is a linear gas-discharge indicator IN-9, connected to the network through a half-wave rectifier. The height of the luminous bar of the indicator is proportional to the voltage. The indicator itself is clearly visible in a darkened room, but the risks applied to its body are almost invisible, which makes it difficult to control the voltage.
If such control is important, it makes sense to refine the indicator and make some lines glowing. Use multi-colored LEDs as marks, placing them in the case so that they shine through small holes. And holes are drilled or cut in places corresponding to critical voltage values. For example, a green LED can be installed where the column height corresponds to 220 V, and two red LEDs can be installed in places corresponding to 200 and 240 V.
The LEDs can be connected in series with the gas discharge indicator (Fig. 1). True, in this case a small current flows through them, so the brightness of the glow is low. But when using LEDs with increased light output, it will be enough.
If you need to increase the brightness, it is recommended to use another option for connecting LEDs (Fig. 2). Now the positive half-wave of the mains voltage is supplied to the gas discharge indicator, and the negative half-wave to the LEDs. It is not difficult to set the desired brightness by selecting the resistor R2.
If you do not have a Ts215 indicator, but have an IN-9 gas discharge device, the mains voltage indicator can be assembled according to the diagrams given by placing the parts in an insulating material case.
Author: I. Nechaev, Kursk
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