2013 Brushed DC-motor pwm what choices do I have ?

[123244]

In year 2013
What options do I have when controlling PWM brushed DC-motor 6-12V battery packs(4xAA or 2x,3x18650) motor's voltage 6-12V ? I like to change different motors and battery packs.
I'd like to DIY: an about 0-100% variable speed PWM. What is the best option and materials\drawings how to do it ?

I really celebrated when I found this: (but after reading many small toy motors have high current even when it says 0.05A in info. Someone said it can 2x-3x,?x when reversed into 3A!?! and that means it will brake my 555's 0.2A)
Bottle neck is 555 Timer IC's 0.2A current
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How to make it accept higher amperes ? (or is it a bad PWM-skeleton to even start advancing with ?)

Simple step by step guides and yes I'm a beginner.(need proper components A,W,V ratings also)

 

[D.A.(Tony)Stewart]

you can always use the 555 to drive a half bridge driver .. but can be pricey
or use the 555 to drive an LDO 7A regulator cheap 1.5$

 

[123244]

How are these made(see links). What type of PWM are they. How they function(Are these easy to make myself ?)

What parts do I need to replicate these linked pwm's ?(any diy internet guides for the type?)

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1.) They have wide range of input voltage(How possible?)
2.) They can give both low and high amperes to loads(How possible?)

 

[chuckey]

1.These PCBs have an IC which needs 5V to make it work, so the minimum voltage is >5V = 6V, the high voltage rating is determined by the output transistors, which in this case was 90V.
2. The current rating is determined by the current the load is taking and its heating effects on the output transistors. So thhe output transistors can handle X amps, so the module is rated at X amps, you could arrange to have it fan coolled, then its rating could be greater then X
You have to be warned that the published figures might be optimistic i.e. instead of 90V use it at no more then 70V. . .
Frank

 

[123244]

Without buying this type of controller:
1.) What IC is it ?

• 8-pins
• >5V input

2.) So the key to these PWMs are the transistors. Three(3) transistors as the source of high amperes.

• Are all 3 same type and have same ratings ? (What function happens with the 3 can there be more or less why 3 ?)

3.) Is this a common circuit type ? How easy is it to find a circuit diagram\component list for the exact type pwm(IC and 3 transistors) from internet so I can do it myself as a small project.

4.) I want to make a universal pwmUse power supplies 0-12V and motors 0-12V)

• Input voltage from 0-12V.
• Amperes draw to max.10A(What max.12V DC-motor uses that is safe)

 

[D.A.(Tony)Stewart]

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Looks like a great choice. Use any PC ATX PSU to drive this board 5V 35A. No problem.if you want 12V 15A out. Variable speed control built-in.