1 sec alternating polarity circuit

[wombweller]

Hello all.
Please see the attached photo of a circuit I’d like to copy. I don’t have the actual board a friend of mine sent me the photo.

It’s a circuit to produce 1 second alternating pulse using the following IC’s-
CD4017B x2, CD4060B x1 and a CD4024B.

Can anyone point me to a circuit diagram for this, maybe there is something online, if there is I’m unable to find it.

I think this circuit is used so it can run on 3v so low power. It’s for pulsing a low voltage Brillie slave clock and needs to be a small footprint so it can go in to the back of the clock and run on batteries.

I look forward to hearing from you.

Regards
Mark

 

[AnalogKid]

If you have pulse shaping before the output transistors, you would need a full bridge driver with four transistors to so that the pulse could be reversed.

Not if you keep the output capacitor as just an output capacitor. If its value no longer is critical to the output pulse width, its size can be determined only by the load characteristics such as the number and types of clocks. One clock, ten clocks, new replacement clocks, whatever - the pulse widths would be unaffected.

ak