how "low" impedance? 500? 50 ? 1 Ohm? how "fast" voltage has to be set?
What is the load?
This will limit output signal to around 4.3 volts
I need to send a signal of between 0 and 12 Volt to an electric-over-hydraulic trailer brake.
A transistor used in emitter follower mode has the "load" between emitter and ground. Therefore "all" of the output voltage appears across this load. There must always be a drive voltage between base and emitter to produce the base-to-emitter drive current. Hence the emitter voltage can never be greater than the base voltage (both relative to ground). If the base voltage is the PWM output of the arduino - a nominal 5 volts, it follows that the emitter voltage can never be greater than the arduino voltage.
QuoteI need to send a signal of between 0 and 12 Volt to an electric-over-hydraulic trailer brake.I stumbled, why not put simple question in subject line "how to switch my trailer brake?" Low impedance line ?