1-cycle-per-30-day oscillator (CB26073E)

This extremely slow circuit produces one pulse per month and can be used in a timer. We found it in the November 1998 Electronics Now magazine.

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Wireless Headphone Transmitter (CB4582E)
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555 with direct relay drive (CB25499E)
Relays up to 100 mA can be driven by the 555 with the recommended circuit. The circuit is from an...
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