Simple PWM Controller on NE555
With the analog integrated timer SE555 / NE555 (КР1006), produced by Signetics Corporation since the distant 1971, most of the Soviet and foreign radio amateurs are perfectly familiar. It is difficult to list for what purposes only this inexpensive, but multifunctional microcircuit was not used for almost half a century of its existence. However, even in spite of the rapid development of the electronics industry in recent years, it still continues to be popular and is available in significant volumes. The simple scheme of a PWM regulator offered by Jericho Uno is not a professional, fully developed development, distinguished by its safety and reliability. This is just a small cheap experiment, assembled on affordable budget details and fully satisfying the minimum requirements. Therefore, its developer does not take responsibility for all that can happen to your equipment when operating a simulated circuit.To create a PWM device you will need:
PWM Controller Circuit on the NE555
- soldering iron;
- NE555 chip;
- 100kΩ variable resistor;
- 47 Ohm resistors and 1KΩ by 0.5W
- 0.1 μF capacitor;
- two 1N4148 diodes (KD522B).
Step-by-Step Assembly of the Analog CircuitBuilding a circuit starting with the installation of jumpers on the chip. Using the soldering iron, we close the following timer contacts between each other: 2 and 6, 4 and 8.
Principle of operation of the PWM controllerThe operation of the PWM controller is quite simple. The timer NE555 monitors the voltage on the capacitor C. When it is charged, until the maximum is reached (full charge), the internal transistor opens and a logical zero appears at the output. Next, the capacitance is discharged, which leads to the closure of the transistor and the arrival of the logical unit. When the capacity is completely discharged, the system switches and everything repeats. At the moment of charge, the current flows along one arm, and when discharging, it is different.With a variable resistor, we change the shoulder resistance ratio, automatically lowering or increasing the output voltage. There is a partial frequency deviation in the circuit, but it does not fall within the audible range.
Date: 18.10.2018, 04:46 / Views: 85251
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