Hi guys
Recently BDD has pointed me towards his clock stretching delay circuit.
The full description and discussion can be found
here (it's worth a read if you're interested and shows the basic circuit design):
To test my Kicad design skills (learned over Christmas) I designed some 2 layer and 4 layer PCBs and had them fab’d. The 2 layer ones are based on BDD’s design.
Here’s a not-so-exciting video showing the circuit in action:
https://www.youtube.com/watch?v=7NDm1zESl4sBDD has graciously given permission for me to post the gerbers based off of his circuit design for others to use, so if anyone is interested here they are:
Attachment:
Gerbers.zip [83.74 KiB]
Downloaded 27 times
Note that you should fit R5 and link/bridge R4
or fit R4 and link/bridge R5
or if you are linking from an existing PCB/project, leave both unfitted.
The circuit takes from 12 to 13mA all in (which includes a 20MHz crystal oscillator which I think most of the power goes towards).