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Old 12-18-2009, 10:09 PM   #1
Brewing Clamper
 
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Default PWM for SSR

So here's what I'm planning on building to control my BK element:


This will be running this ssr. The PWM circuit has a frequency of about 144Hz but can be changed easily. My question is, what would be the best frequency to set in order to increase the life of the ssr? Also, how would I add a level indicator to this circuit? Thanks!


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Old 12-18-2009, 11:49 PM   #2
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Most SSRs will only turn on at the start of a half-cycle, so pulsing it with such a high frequency will not be useful. Keep the frequency around 1 Hz instead.

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Old 12-18-2009, 11:51 PM   #3
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Actually, look around for some better 555 circuits. That one doesn't seem well suited for this purpose. I would expect you want to drive the ssr with pin 3.
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