In modern circuits are widely used various modifications resistors.The main characteristics of these elements - is the electrical resistance.The secondary characteristics of such products include power dissipation and maximum error of the nominal resistance.Depending on the possibility of changing the resistance, the constants and variables distinguish this type of wireless components.The first type of the element has a certain resistance which can not be changed.In turn, the second embodiment of this component may change this characteristic.This class components include a potentiometer dimmers, variable and trimmer.The first two most often used in power electronics, the latter two most commonly used in microelectronic devices.
On a design variable and trimmer divided into provoloochnye and besprovoloochnye.Depending on how the change in resistance, distinguish rotary and slider.
most simple design at provoloochnogo resistor.As the base, it acts in a dielectric ring.This element is wound wire, the ends of which are attached to the 2nd deadline contacts radioelement.Top mounted handle with slider (it should fit snugly inside the ring) and fitted lid with a slot screwdriver to rotate.In the next step establish central contact, which would connect between a central terminal and an element of rotation.The final stage of the manufacture of a radio as trimmer, is to install the assembled structure in the protective housing.So a brief look technological chain of production of these components.If the item is assigned to Class besprovoloochnyh, then skips the winding wire - ring is not made of a dielectric, and already once of a material with high resistance (most often - a rare earth material having a very high price).Cost of components made in this way, more than in the first case, and because of this they have not yet received wide distribution.
This electronic item found greatest application in the amplifier stages (with the help of the gain is adjusted).At the entrance to set the resistor with constant resistance, and output - a variable.After the end of the assembly scheme is using the last item selected desired gain.For this spinning slot until until a desired operation stage.Once setup is complete, the top varnish applied (by a resistor).Trimmer component may inadvertently turn (by touch, vibration, fall) and then have to re-adjust the scheme.To avoid this, and is applied on top of nail polish to fix the value of the resistance.
Rate the importance of the role played by the trimmer in modern microprocessor technology (and not only) is quite difficult.But it is safe to say that such a radio component is used in almost all electronic devices.And trimmer every year are becoming more widely used in the new circuit solutions.
