S spec Well-Known Member Most Helpful Member Jan 18, 2017 #21 Pommie said: I've learn't something new today. Thank you. Mike. Click to expand... me too spec
ronsimpson Well-Known Member Most Helpful Member Jan 19, 2017 #22 Pommie said: However, it begs the question, why use a diode at all? Wouldn't a resistor that is 4 times the relay coil resistance do the job better? Click to expand... With a diode you only need a 15 volt transistor. With 4X resistor you need a 60V transistor. (assuming you are driving a relay with a transistor)
Pommie said: However, it begs the question, why use a diode at all? Wouldn't a resistor that is 4 times the relay coil resistance do the job better? Click to expand... With a diode you only need a 15 volt transistor. With 4X resistor you need a 60V transistor. (assuming you are driving a relay with a transistor)
P Pommie Well-Known Member Most Helpful Member Jan 19, 2017 #23 It was just a quizzical question. I guess you could dispense with diode or resistor and just use a 2,000V transistor. Mike.
It was just a quizzical question. I guess you could dispense with diode or resistor and just use a 2,000V transistor. Mike.
crutschow Well-Known Member Most Helpful Member Jan 19, 2017 #24 Pommie said: It was just a quizzical question. I guess you could dispense with diode or resistor and just use a 2,000V transistor. Click to expand... Assuming the stray capacitance is high enough so the the inductive energy doesn't push the voltage higher than that.
Pommie said: It was just a quizzical question. I guess you could dispense with diode or resistor and just use a 2,000V transistor. Click to expand... Assuming the stray capacitance is high enough so the the inductive energy doesn't push the voltage higher than that.
P Pommie Well-Known Member Most Helpful Member Jan 19, 2017 #25 I just love it when the magic smoke gets released. Makes my day. Mike.