Hi Guys
Can anyone help me with my calculations for the resistor values associated with the high side switching circuit in the attached diagram? The values on the diagram are pretty arbitrary at the moment, but I'm happy to use them if I can be convinced that they'd work ok. The switching circuit is just a simple pulsed ON-OFF cycle controlled from an Arduino.
I understand the theory of what each resistor is for, but get confused when trying to combine two sets of transistor data. Are the transistors I've selected to use here overkill? Can anyone suggest a suitable pair in SOT-23 form that would be better?
I've used this configuration because I believe the voltage at the PNP base would be more negative than Vcc, which although is the same supply as the Arduino, there would be sufficient voltage drop that the PNP wouldn't switch off - does that sound sensible?
Thanks in advance
Bernie
Can anyone help me with my calculations for the resistor values associated with the high side switching circuit in the attached diagram? The values on the diagram are pretty arbitrary at the moment, but I'm happy to use them if I can be convinced that they'd work ok. The switching circuit is just a simple pulsed ON-OFF cycle controlled from an Arduino.
I understand the theory of what each resistor is for, but get confused when trying to combine two sets of transistor data. Are the transistors I've selected to use here overkill? Can anyone suggest a suitable pair in SOT-23 form that would be better?
I've used this configuration because I believe the voltage at the PNP base would be more negative than Vcc, which although is the same supply as the Arduino, there would be sufficient voltage drop that the PNP wouldn't switch off - does that sound sensible?
Thanks in advance
Bernie
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