It's mentioned in Douglas Self's book. The single resistor situation means that when the output transistors are required to turn off the base charge is removed more quickly if connected to a lower voltage (for the upper transistor).Can you explain R5 and R6? I know Darlington's often have a resistor from the base to emitter of the output transistor, but I have never seen them connected like this, without connecting to the emitters. TS had them both connected to ground @Jony130 suggesting removing the ground connection, and AG did that, as well as increasing the by 10X as I suggested.
R5 and R6 have resistances too low. They are shown on darlington transistors datasheets.You mean r5 and r6 will neither connect as the first circuit I showed nor the latest one.
I usually connect the middle of r5 r6 to output as the first circuit.
(r5 and r6 should be combined to 1 resistor if I use the latest version)
I disagree - I'm not saying that they must be that low, but the lower the better if you want to get the power transistors turned off as quickly as possible, provided that the driver stage can deliver the current. I used 47Ω for a single MJ15003/4 output stage and 22Ω for a double.R5 and R6 have resistances too low. They are shown on darlington transistors datasheets.
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by Jake Hertz
by Jake Hertz
by Aaron Carman