In my last project i did this step up
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Ok IC8 isn't needed, but can't change the Jpg now...
I put an on/off button before SL1. The positive rail (from batteries) is connected directly to the positive SL1 (+) , and the negative rail is connected to the button and then to the (-) batteries.
I see that often (always) is difficult to let the circuit start (my 90 led's bingo with internal speaker :lol: )
After a lot of on/off swithces , randomly, the circuit start working.
I notice that if i detach and reattach the SL1 connector from the batteries, the circuit starts better.
Why ? Must I use a different button ? Something wrong in the design ? Too much current request at startup ?
Thank you