Basic question about capacitors

Apr 10, 2008 1 Replies

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Stickman 18 years ago

Hi all.

I'm assembling a stepper motor control circuit using the L298

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and don't have the proper capacitors on hand. The circuit calls for a 0.1uF caps between 5V & ground, another 0.1uF cap between the 24V motor power and ground, and a 100uF cap to absorb voltage spikes coming back from the motor.

Am I correct in thinking that for these purposes, the capacitor values are not critical, as long as the capacitance is greater than that specified? I have no 0.1uF caps on hand, but a pile of 22uF caps. Can i use these instead?

Thanks for the help!

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Rich Grise 18 years ago

When it calls out 0.1 uF, I wouldn't recommend substituting a 22 uF, because of the different capacitive reactance at the higher frequencies where the switching noise is at.

Just go ahead and order a pile of 0.1 ceramics - here's an example:

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100 of them is $5.90. ($0.059 each :-) )

Cheers! Rich

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