Re: 7D15 internal trigger not working

Mark Vincent


If you get the KSP10BU transistors, these have a pinout of BEC. They are not the common EBC or ECB pinout. I suspect all of your 0402 transistors are leaky from what you already checked. Checking them out of circuit will confirm leakage or not. If you want to have some fun, use a battery of 9 or 12V, a series resistor of about 1000 ohms or so and treat the transistor as a diode (E and C used) and see what voltages you get across each device. Reverse the battery connections or E and C connections and see what happens to the voltages across each of the two. This is done with the transistor out of circuit and base not connected.


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