Hi Guys -
I’ve tested my understanding using the ShiftOut tutorial, and made the circuit using LEDs - but now need to step it up to power 12 number 12V solenoids. I’ve put in diodes (IN5404) to stop the current reversing when the solenoid is discharging, and also transistors (TIP-122) to step up from the low current / voltage of the Ardunio circuit to the solenoid circuit.
A couple of questions I have relate to:
_If a resistor is needed between the output pin of the 595 to the gate pin of the transistor (and if so, what size); and
_If a capacitor is needed across the latch pin (and if so, what size).
The solenoids will only be on one at a time - details as follows:
Rated Voltage: 12V
Operation Voltage: 10.8V - 13.2V
Rated Current: 0.58A
DC Resistance: 20.57 Ohm.
Any suggestions on what I’ve missed / how to improve efficiency greatly appreciated.
Many thanks for you help in advance -