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usb e kits presents
555 pwm controller

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functionality

This is a simple pwm controller based on the famous 555 timer chip.
It is necessary for dc devices that needs to be dimmed like high power leds,motors,fans e.t.c.
There isn't enough talk about this circuit.
With the potentiometer you can adjust the pulse length of the output.
With the capacitor c2 you can change the frequency of the output.
By default and with the C2 at 10nf the output is rated at few khz.
The bigger the capacitor the smaller the frequency.
The circuit can operates in a wide input voltage range beginning from 5 volts and up to 18 volts.
The output can sink current up to 4 amps.
If necessary attach a heat sink on the mosfet.

the power transition to the output is 5-95%.

Technical Features

Layers :2

PCB Thickness : 1.6mm

Dimensions : 50 mm x 24 mm ( 2 inch x 1 inch )

Mounting holes dist:17.8mm

Operating Voltage : 5-18 Vdc .

Operating current : 20 ma

Output sink current: 4 amps max

Rel.date:17/05/14

the circuit schematic

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555 pwm controller

Dimensions

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part list

Ref.        Type                                        Value
C1        Ceramic Capacitor          10nF
C2        Ceramic Capacitor          10nF
C3        electrolytic capacitor        22uf
D1        high speed diode               1n4148
D2       high speed diode                 1n4148
D3       3mm difused led                Green
J1         Terminal Block                 6 pin Dc input & sink outputs

Q1       n-channel mosfets             irfz44n

R1        Resistor 1/4 watt              1k
R2        Resistor 1/4 watt              1k
R3        Resistor 1/4 watt             1k

U1       timer chip                           555
RV1     potentiometer                   50k


construction help guide

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resistor color code definition
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LED
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dip ic bases
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Standard 5mm pitch terminal blocks
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click for soldering and prototyping assistant

downloads

Pcb layouts
Datasheets

request one

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Frequently asked questions about the kit



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