Hi Michael,

    That’s the big advantage of the Lectron system.
    Once a circuit isn’t working as suspected, it’s so easy and fast to adapt without the need of desoldering or chang the wiring !

    The problem with the original design was that the current flowing through the 120 Ω resistor was too large.
    Once the capacitor was charged, the Schmitt trigger activates and made the capacitor discharge through the B-E junction of T1 and the 120 Ω resistor.

    Now by choosing a 220 Ω value for R7, this doesn’t occur anymore !

    In the next experiment, we will make use of this phenomenon to make a cool circuit !

    Many greetings,