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LM 555 based dimmeable led
I want to show
a led dimmer
for controlling light intensity of a LED string
based in LM555 oscillator
in astable configuration
with PWM modulation
controlled from this potentiometer from here
this is the 555 IC
two necessary regular diodes
PNP output transistor
A BC548 transistor is enough
for two feet of led string
beacuse BC548 load support over 300mA
The base transistor resistence...
This is all
Now the LED is connected at the lowest power
and I will vary the potentiometer to show them
The ligth variation is not linear
but works fine
I'll turn off the lights to better appreciate
well
this is a good option to light the work table
can be installed in a wall box
The circuit is very simple
but works
Bye
circuit diagram