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.
Here is a first pass at a re-work of the #22 schematic. I did not verify that this is a correct schematic for the board in Post #1. Click on the schematic for a larger image.
Note: Adjust R1, R2, C1 and C2 for the crystal being used.
My design libraries have parts created by seven different people over a couple of decades, so my concept schematics often have things like a 20 amp FET where a 1 A part will suffice. 5% still is the most common tolerance for small through-hole resistors, but there is nothing critical about the base-current-limiting resistor values.