Comments for Roko.ca

Comment on H-Bridge Fundamentals by arash

arash — Sun, 24 Jan 2010 21:45:42 +0000

hello
my friend
please help me
please send pdf or shematic file circuit driver dc motor 24 v for automatic door(left or right fasrt speed and low speed by pwm and countering rpm by shaft encoder ) by mosfet and L99H01 chip or masfet and ir 2102 chip

thank you

please send now
i am a waiting

Comment on About by rez

rez — Sat, 23 Jan 2010 17:27:36 +0000

hye..i’m rf student and interested in robotic..hope u can share many more about rf application such as ur project ..thnx 4 shared =)

Comment on Mini Sumo PCBs… by vineet

vineet — Thu, 21 Jan 2010 11:57:14 +0000

i want to design a mini pcb…so tell me about it…i hv its circuit………….but pcb should be very small…………

Comment on H-Bridge Fundamentals by genotio

genotio — Tue, 19 Jan 2010 20:47:08 +0000

Note that you can put 2 or more mosfets in paralell. Rdson will be smaller, but driver will be more loaded.

Comment on H-Bridge Fundamentals by John Essen

John Essen — Wed, 13 Jan 2010 05:40:15 +0000

A clearly written article on this subject, it answered all my questions.
Thanks Roko

Comment on H-Bridge Fundamentals by Martin Kynde

Martin Kynde — Sun, 13 Dec 2009 13:28:20 +0000

Hallo Roko

I think you have right. Sorry for the confusing

Comment on Quadrupeds Need a Whole Lot of Motor Controllers by Roko

Roko — Thu, 10 Dec 2009 08:09:20 +0000

Hi Mike, Thanks for the comment!

The potentiometers I’m using are part number P12426CT-ND at Digikey.

Comment on Quadrupeds Need a Whole Lot of Motor Controllers by Mike

Mike — Thu, 10 Dec 2009 05:36:31 +0000

This is a beautiful piece of work. Care to email me the digikey part number for those potentiometers? I’m looking for a part just like that myself.

Comment on H-Bridge Fundamentals by Roko

Roko — Wed, 02 Dec 2009 16:47:05 +0000

Hi Martin,

I believe you’re confusing the operation of P and N channel FETs. As the paragraph below figure 3.2 states, the P and N channel fets are activated by opposite polarities.

Thus, the interface circuit is correctly set up to provide a high signal to Q4, and a low signal to Q1 to switch them both on, while ensuring that the others are off.

Comment on H-Bridge Fundamentals by Martin Kynde

Martin Kynde — Wed, 02 Dec 2009 11:52:48 +0000

Hallo

I am studying electronics. The interface circuit would not work! Q1 and Q4 has to work together, and Q2 and Q3, else the motor would not turn in any direction. Just swap Q1 with Q2 on figure 3.2, then it would work