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Your projects / Re: Motherboard fan header boost circuit
« Last post by fog2y on June 17, 2017, 09:50:50 AM »
I know this topic is death for a long time but... I would sugest using an optocoupler:)
Your projects / PC fan ok/failure indicator circuit
« Last post by fog2y on June 16, 2017, 23:59:02 PM »

I am currently workin on a fan ok/failure led indicator.
I have a circuit finished and tested, but i would like to know some suggestions on improving the circuit from someone who is more educated in the DC circuits design than I am - It is just my hobby, I work as an automotive quality technician:)

The circuit follows.

Thanx for your replies
General Discussion / Re: PCB Glossary and PCB Prototype
« Last post by sorvillo on June 16, 2017, 06:25:49 AM »
very valuable information for me. Thanks a lot!
Your projects / Step motor driver
« Last post by johniee on May 17, 2017, 22:07:54 PM »
Good evening!!!
In a application with a step motor i observe that some times the step motor stop moving. In a cycling programm the movment some times the step motor does not execute!! I observe that if i increase the pulses resolution of step driver the problem is eliminate, but if i increase the speed pulses/ sec  the broblem appears again. The load is small.
Thanks in advance!!
Kisses from peristeri attikis!
No problem Giorgos and thanks for the reply.
hard disc drives are totally different and cannot be controlled by these circuits. Sorry.
Your projects / Re: overheating Circuit
« Last post by Soldertraining on May 05, 2017, 16:53:55 PM »
The circuit is overheated mainly due to a loose connection. There may have other reasons also like an excessive current, poor connections, and insulation breakdown.
General Discussion / Outrunner Stepper
« Last post by aliaykan on April 26, 2017, 21:25:20 PM »

I searched but couldn't find any sample of outrunner stepper motor. Is it possible make an outrunner stepper motor like outrunner BLDC?


Your projects / Re: Closed Loop high frequency PWM PC Fan Controller
« Last post by kam on April 20, 2017, 08:29:22 AM »
I do not use interrupts, that is why you see no RETFIE.
When compiling, do you get any error messages?
Also, make sure that the configuration word is active:

Or let MPLAB set the configuration as per the above line.
Your projects / Re: Closed Loop high frequency PWM PC Fan Controller
« Last post by oachalon on April 14, 2017, 05:55:48 AM »

My skills are introductory.  I understand what you are trying to provide, and i built your circuit exactly, but nothing worked.

Do you by chance have a version that works with a PIC16F series? 

In the Init you are clearing the interrupt, but i dont actually see your interrupt routine and i dont see any RETFIE when you leave the interrupt.  Its difficult for me to see exactly what is going on. 
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