Hi,
I'm entirely new here. It would be great to get a hand with
this power supply challenge. The circuit is attached.
It begins with a transformer, with 3 secondary wires and 2
secondary voltages, 30VAC and 10VAC. I want to power a
solenoid and an Arduino from these.
I'm using a motor to bench test, the solenoid is sitting
inside a door.
The circuit works perfectly when the Arduino is powered
from the computer. It will vary the motor speed using PWM.
(Arduino ground and pin 10 are connected into the circuit
as shown, but not the 5V VCC)
But upon removing computer power and powering Arduino
from the 7805, well... smoke, and fast.
Tried using 100k pulldown on the MOSFET source, and 10k
from pin 10 to gate, but still smoke. It might have worked
for a second... difficult to tell.
All the voltages are good, everything good, until changing
the Arduino power source.
Any thoughts? Would be much appreciated. Thanks.
Mark
I'm entirely new here. It would be great to get a hand with
this power supply challenge. The circuit is attached.
It begins with a transformer, with 3 secondary wires and 2
secondary voltages, 30VAC and 10VAC. I want to power a
solenoid and an Arduino from these.
I'm using a motor to bench test, the solenoid is sitting
inside a door.
The circuit works perfectly when the Arduino is powered
from the computer. It will vary the motor speed using PWM.
(Arduino ground and pin 10 are connected into the circuit
as shown, but not the 5V VCC)
But upon removing computer power and powering Arduino
from the 7805, well... smoke, and fast.
Tried using 100k pulldown on the MOSFET source, and 10k
from pin 10 to gate, but still smoke. It might have worked
for a second... difficult to tell.
All the voltages are good, everything good, until changing
the Arduino power source.
Any thoughts? Would be much appreciated. Thanks.
Mark
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