1800 Hz Reject Filter (CB7400E)

Found in Exar documentation from the 1980s, this circuit has a 60 dB cutoff at 1800 Hz. The circuit can be adapted to operate at other frequencies.

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Sine to square converter (CB7329E)
Using a 555 this circuit was found in old documentation, but it is still valid. | Clique na imagem...
Square Generator 555 (CB10547E)
This circuit was obtained in a 1976 magazine. We can use the 555 and another BC548 to generate square...
Divide-by-3 Counter (CB158E)
The circuit presented here shows how two flip-flops of a 4027 can be connected to perform a...