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Author Topic: Replacement dual H bridge  (Read 2463 times)

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Offline DaemonToad3Topic starter

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Replacement dual H bridge
« on: October 03, 2010, 07:58:09 AM »
I am busy trying to build this:
http://www.robotroom.com/Joystick2.html

What is a suitable and cheap replacement for the FAN8200? It still needs to handle a 9v motor. Help would be much appreciated.

Offline DUKELancelot

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Re: Replacement dual H bridge
« Reply #1 on: October 03, 2010, 10:12:49 AM »
An L298?
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Offline Soeren

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Re: Replacement dual H bridge
« Reply #2 on: October 03, 2010, 10:21:58 AM »
Hi,


Why not just use the FAN8200?
Can be bought here as a non-Fairchild replacement:
http://www.wrighthobbies.net/catalog/product_info.php?products_id=65&osCsid=157


L293 is close, slightly more powerfull, different pinout, DIP package, L293D has got diodes built-in.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
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Offline DaemonToad3Topic starter

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Re: Replacement dual H bridge
« Reply #3 on: October 03, 2010, 10:54:20 AM »
I live in South Africa and none of my local suppliers stock the FAN8200 so inporting it will cost around $30 which is an option that I would prefer to avoid.

Which is the better alternative between the fan8100 or the L298?
« Last Edit: October 05, 2010, 10:11:07 AM by DaemonToad3 »

Offline Soeren

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Re: Replacement dual H bridge
« Reply #4 on: October 03, 2010, 11:23:06 AM »
FAN8100 is fine.
You need to start getting datasheets for the chips that you wanna compare and for how they should be mounted.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline blackbeard

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Re: Replacement dual H bridge
« Reply #5 on: October 03, 2010, 09:06:22 PM »
what about the lm293d? i got 4 for $1
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Offline DaemonToad3Topic starter

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Re: Replacement dual H bridge
« Reply #6 on: October 04, 2010, 07:32:20 AM »
what about the lm293d?

That's a dual comparator I think. Thanks for the input anyway.

The cheapest chip I have found so far is the ROHM BA6845FS. Datasheet: http://tinyurl.com/33esvao

With the FAN8200 it has an enable pin and a single input. To run it in the circuit in my first post I just had to power up the enable and give a current to the input for the motor to use.

With the BA6845FS it has 2 "logic inputs", how would I connect this chip in the diagram? And what are the N.C. pins?
« Last Edit: October 04, 2010, 07:36:11 AM by DaemonToad3 »

Offline pic16f628

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Re: Replacement dual H bridge
« Reply #7 on: October 04, 2010, 08:47:17 AM »
Hi

The L293 may work if the motor does not draw more than 600mA.
You can order it from Rabtron in SA for R31.07 
see http://shop.rabtron.co.za/catalog/

I am currently trying to make an H-bridge to drive a motor from a PIC using TIP122 and TIP127 Darlington pairs but I am a newbie, wannabie roboteer and struggling. It should be simple, since they each only have 3 leads (bce) like normal transistors.  But no matter whether I put a + voltage or - voltage across the TIP127 base lead,  (which is PNP), a current still flows from c to e and the base does not seem to switch it off.  Ahh well, I am probably doing something stupid.

Offline Soeren

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Re: Replacement dual H bridge
« Reply #8 on: October 08, 2010, 08:55:21 PM »
Hi,

what about the lm293d?

That's a dual comparator I think. Thanks for the input anyway.

No, it's a motor driver.


The cheapest chip I have found so far is the ROHM BA6845FS. Datasheet: http://tinyurl.com/33esvao

Dead link?


With the BA6845FS it has 2 "logic inputs", how would I connect this chip in the diagram? And what are the N.C. pins?

N.C. is short for "No Connection".
The datasheet have a full explanation.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Webbot

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Re: Replacement dual H bridge
« Reply #9 on: October 10, 2010, 02:59:55 PM »
what about the lm293d?
That's a dual comparator I think. Thanks for the input anyway.
No, it's a motor driver.
The L293D is a motor driver but the LM293D is a ....?
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Offline Soeren

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Re: Replacement dual H bridge
« Reply #10 on: October 10, 2010, 05:11:59 PM »
Hi,

The L293D is a motor driver but the LM293D is a ....?
Ahh, good catch - an easy mistype to make for blackbeard and not something you'd expect, so easy to overlook the "m".
Well, I allready mentioned the L293D, but it didn't seem to interrest the OP.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

 


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