about 555 PWM generator

Thread Starter

LAOADAM

Joined Nov 21, 2018
273
Hi,
I followed the YouTube 555 PWM. Simple Circuits :
to do on breadboard, I got wave some time, but can not adjust the output, the led‘s brightness doesn't change when turning the pot, and also can't get the result repeatedly?
what should do now?
Thanks
Adam
 

Thread Starter

LAOADAM

Joined Nov 21, 2018
273
In that circuit the pot controls the duty cycle and the cap value determines the frequency.
Thanks.
So, the possible reason the pot doesn't effect may be wiring error? also I saw some body used Electrolytic capacitor and some used Ceramic capacitors, big difference?
Best.
 

Alec_t

Joined Sep 17, 2013
11,529
does the Electrolytic capacitor and Ceramic capacitors matter?
If you are using an electrolytic cap then the polarity must be correct. Polarity doesn't matter for a ceramic cap.
If the pot doesn't vary the brightness, make sure you have the polarity of the diodes correct.
 
Top