Since I can't add attachments to a PM:
The MK111 would be the wrong kit for that. You need something with two timers or a dual (LM556) timer. Something like this might work for you:
**broken link removed**
You'll have to change the leftmost 22uf cap to a 470uF one to get apx 25 seconds. If you replace the leftmost 47K resistor with a 50K pot, you can fine tune it to 20 seconds. Like this:
skybird9 said:
The MK111 would be the wrong kit for that. You need something with two timers or a dual (LM556) timer. Something like this might work for you:
**broken link removed**
You'll have to change the leftmost 22uf cap to a 470uF one to get apx 25 seconds. If you replace the leftmost 47K resistor with a 50K pot, you can fine tune it to 20 seconds. Like this:
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