Home
Contact
Forum
Projects
Experiments
Circuits
Theory
BLOG
PIC Tutorials
Time for Science
RSS
Terms of services
Privacy policy
Home
Forum
Projects
Experiments
Circuits
Theory
BLOG
PIC Tutorials
Time for Science
PCB Heaven
Electronic Workbench
Welcome,
Guest
. Please
login
or
register
.
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Home
Help
Login
Register
PCB Heaven
»
General Category
»
Your projects
»
3 wire fan controller
« previous
next »
Print
Pages: [
1
]
Go Down
Author
Topic: 3 wire fan controller (Read 2816 times)
0 Members and 1 Guest are viewing this topic.
zc0rp
Newbie
Posts: 2
3 wire fan controller
«
on:
February 04, 2015, 15:33:00 PM »
Hi all, I've got a problem with the 3 wire circuit... everything works but...
the max voltage on load is about 7v instead of 12v. i'm using a 12v 5a powersupply.
it's for operating 4 fans on one controller, the fans are max 0.5 amps.
can anyone help me out please? thanks in advance.
i've used this tut:
http://pcbheaven.com/circuitpages/High_Frequency_PWM_Fan_Controller/
Logged
kam
Administrator
Hero Member
Posts: 1849
Re: 3 wire fan controller
«
Reply #1 on:
February 06, 2015, 22:16:55 PM »
Hello zc0rp. Typical mistake on this circuit are the PWM diodes. You do not get all 100% duty cycle.
Logged
zc0rp
Newbie
Posts: 2
Re: 3 wire fan controller
«
Reply #2 on:
February 09, 2015, 13:52:20 PM »
can you tell me how to fix this? i'm a complete n00b... just that you know
Logged
kam
Administrator
Hero Member
Posts: 1849
Re: 3 wire fan controller
«
Reply #3 on:
February 10, 2015, 21:23:20 PM »
well, actually I can only tell you that you have most likely make a mistake by copying the schematic on the breadboard. I can't tell what you have done wrong. But most common mistake is that you have connect the diodes wrong.
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
PCB Heaven
»
General Category
»
Your projects
»
3 wire fan controller