Sine to square converter (CB7329E)

Using a 555 this circuit was found in old documentation, but it is still valid.

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Two diodes power supply (CB4243E)
This is the traditional unregulated power supply configuration with full wave rectification. For currents...
From Smart Lights to the Dark Side of Home Automation
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Battery Monitor (CB6067E)
This simple circuit has its trigger point set in the trimpot. The transistor can be any general...