I want to drive a small relay which, in turn, will activate a gates' magnetic lock or similar item (requires 12V 1A).
The 2N3904 can manage 200mA continuous
0.85V and 6V to saturate the gate
so doesn't require a resistor between the pin and gate,
the 2N3904 base will draw from the output pin ?
and a diode across the relay contacts.
Use this board ,it can drive till 4 chanelsArduino 4 Route MOSFET Button IRF540N Free 4 cable
Yep, I meant to say the contacts for the relays' coil.
QuoteYep, I meant to say the contacts for the relays' coil.Better to call them 'relay coil terminals', as 'contacts' have a specific meaning in context with relays. Lefty
Now about the best way to isolate the boards' input pins from the 12V circuit around my house (magnetic door and window contacts) .....