24v to 5v/12v pwm controller with a potentiometer

Thread Starter

Moonities

Joined Feb 27, 2019
13
hi guys im trying to make 24v to 5v/12v pwm controller with a potentiometer to go onto a pcb this is the rough idea i could be totally wrong on this and its a very messy schematic but just wanted some opinions and a little bit of help because ive only ever made super basic ideas

the idea is this board will take 24v convert it down to a voltage 5v to run the 555 timer which allows me to control the speed of some pwm fans with an potentiometer

im rather sure ive messed this one up but would love to have some help to get this perfect
 

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crutschow

Joined Mar 14, 2008
23,742
At first glance, you have a capacitor in series the the 24V to U1, which will block the DC.
I assume it's supposed to go to ground as a filter.

You appear to be missing a connection between the 555 THRS pin and the TRIG pin.

The 555 output will need to drive a transistor to power the fans.
 

Thread Starter

Moonities

Joined Feb 27, 2019
13
At first glance, you have a capacitor in series the the 24V to U1, which will block the DC.
I assume it's supposed to go to ground as a filter.

You appear to be missing a connection between the 555 THRS pin and the TRIG pin.

The 555 output will need to drive a transistor to power the fans.
probably hashed this up but hows this ?
 

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