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A 4047 is made by most semiconductor IC manufacturers. Their prefix isn't all "CA". Motorola (now called ON Semi) call theirs an MC14047B. All newer ones have "B" as a suffix which means the outputs are buffered. Some manufacturers use uA as a prefix and call it a uA4047B. Texas Instruments used to call theirs an SN4047B.

I just looked. Toshiba doesn't make it.

Rhonn is in The Philippines. He helped me fix the original faulty project. His e-mail address is on our corrected schematic.

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xerex,
The 4047 is only giving clock signals of 50 or 60 hz which are complimentary to each other. If you cannot find a 4047, the same could be achieved with a 555 and an inverter chip.

MP

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