How to make a volt

Conventional Zener diodes are available in voltage stabilization not less than three volts. Often, however, there is a need for the stabilization of voltages on the order of one volt. For this purpose the so-called stabistor.

Instruction

1. Remember that stabistor, regardless of whether they are specialized or they are used as regular diodes, not always included in the reverse voltage, and direct, in contrast to Zener diodes.
2. For the highest quality to the stabilization of low voltage use specialized stabistor. Examples include 7ГЕ2А-K and 7ГЕ2А-S. Different instances allow to obtain the voltage from 1.3 to 1.6 V. Once, choosing the instance with the required voltage, you can be sure that when the current stabilization from 1 to 10 mA, the voltage on stabistor will vary slightly.
3. As a makeshift stabistors use semiconductor diodes, LEDs, and selenium washer various brands, transitions transistors (even those who have two transitions serviceable one). Some of them make in this mode the voltage is below voltsand some higher. First roughly determine the voltage stabilization of such a device, plugging it in straight polarity the multimeter to diode check. The measurement result is the voltage stabilization, i.e., any conversion is not required. At least it is germanium devices, a few more from silicon, a maximum of LEDs and selenium goals.
4. Make sure that your chosen device actually stabilizes the voltage in the chosen range of currents. The upper limit of this range should not exceed the maximum allowed forward current through it. If necessary, use a heat sink. Flow through the device is a direct current corresponding to the lower end of the range, plug in voltmeter. Gradually increase the current to a value corresponding to the upper boundary of the range. Check out whether the change in the voltage beyond the requirements for you to stabilizer.
5. Collect on a real or a makeshift stabistor parametric stabilizer, according to the scheme differs from the classical only in that the current through the device is skipped in the forward direction. In the finished stabilizer, if necessary, use a heat sink.
6. If you want, try to get a stable voltage of about one voltand the following method. Assemble the two parametric stabilizer, voltage which are different to this value. Load turn on between their outputs.
7. Finally, if you have a stabilizer LM317T, will get a voltage of 1.25 V by including it on a custom scheme - without additional elements, connecting the control pin directly to GND.
8. In the physical laboratory of the school or College to obtain a stable voltage very close to one volt, it is possible to use a so-called normal element of Weston. Treat him very carefully: do not drop, disassemble, do not turn, do not load large currents, moreover, is not short circuited. All operations perform under control of the teacher. In any case, don't keep such items at home, don't try to make their own. Remember that they contain mercury and cadmium.