Voltage regulator with indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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The device shown in fig. 1, designed for smooth voltage regulation in low-power loads. With its help, it is possible to power a second additional radio engineering device from one power source with a power reserve. For example, a 15 ... 20 V power supply feeds the necessary circuit, and you need to additionally power a transistor receiver from it, whose supply voltage is lower (3 ... 9 V).
The circuit is made on a field epitaxial-planar transistor with a pn-junction and an n-channel KP903. During the operation of the device, the property of the current-voltage characteristics of this transistor was used at different voltages between the gate and the source. The family of characteristics of KP903A...B is given in [1]. The input supply voltage of this device is 15 ... 20 V. Resistor R2 of the PPB-ZA type with a nominal value of 150 Ohm. With it, you can set the required voltage in the load. The disadvantage of the regulator is the increase in the internal resistance of the device when the operating voltage is lowered.
On fig. 2 shows a diagram of the voltage indicator of the above-described regulator, assembled on a field-effect transistor KP103. The device is designed to control the voltage in the load. The connection of this indicator to the regulator device is carried out according to the above diagram.
Depending on the letter index KP103 of the indicator installed in the circuit (Fig. 2), we will fix (by the moment of ignition of the HL1 LED with an increase in the output voltage) the operating voltage in the load.
The effect of fixing different voltages in the load is obtained as a result of the fact that the KP103 channel transistors have different cutoff voltages depending on the letter index, for example, for the KP103E transistor it is 0,4-1,5 V, for the KP103Zh it is 0,5-2,2, 103 V, for KP0,8I - 3-1 V, etc. [XNUMX].
By installing a transistor with the required letter index, we will fix the required output voltage. For example, when a KP2E transistor is installed in the circuit (Fig. 103), the operating voltage in the load will be about 4 V.
When connecting the circuit (Fig. 2) to the circuit (Fig. 1), the load must be connected.
It should be noted that both circuits allow novice radio amateurs to better understand the physical essence of the operation of a field (channel) transistor with a pn junction. When experimenting, the user can swap the source and drain of transistors in places.
Literature
- Handbook of semiconductor devices. -10th ed. K: Technology. 1984. - p.248,260.
Author: O.Nikitenko, Kiev
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