There is a problem with this circuit. The original document specified 3V for power supply. However, the capacitor 13 is only charges to around 0.8v and then stops when I used 3V and it doesn't trigger SCR 7. I tried 9v and it works sometimes with this voltage. When I disconnect the gate of SCR 7, it seems to be charging fully. I am using TICP106D SCR. In the original document the SCR was BRY55. Both are sensitive gate SCR as far as know, so they should (?) be interchangeable. I don't understand why the current is leaking this much through the gate. Do you have any suggestion?