We currently live in the era of speed and sophistication. Everything that man once developed and found to be too time consuming and cumbersome has been modified, altered and compacted to make its use more simple. To cope up with this speed, every routine work has been automated. This pursuit of professional excellence has forced people to spend less time on themselves. For example, shaving is almost a daily chore for men to ensure personal hygene and needs to be done fast. But doing so with manual razors is a time consuming job and if done to hastily, can lead to cuts and burns.But thankfully, the technology of this age offers replacement to old age instruments like manual razors and frequent visits to a barber shop by time effective handheld devices like hair clippers and beard trimmers. Unlike manual razors and scissors, trimmers are devices that cut, but don’t bite and that too in very less time. 

A trimmer or preset is a miniature adjustable electrical component. Trimmers can be variable resistors (potentiometers), variable capacitors, and trimmable inductors. They are common in precision circuitry like A/V components, and may need to be adjusted when the equipment is serviced. Unlike many other variable controls, trimmers are mounted directly on circuit boards, turned with a small screwdriver and rated for many fewer adjustments over their lifetime. Trimmers like trimmable inductors and trimmable capacitors are usually found in superhetrodyne radio and television receivers, in the Intermediate frequency, oscillator and RF circuits. They are adjusted into the right position during the alignment procedure of the receiver. Trimmers come in a variety of sizes and levels of precision; for example, multi-turn trim potentiometers exist, in which it takes several turns of the adjustment screw to reach the end value, allowing for very high degrees of accuracy.