All Questions
27
questions
1
vote
0
answers
22
views
Sprinkler controller couples electrical noise between stations, firing wrong solenoid
I've been trying to troubleshoot a Toro DDCWP 4 battery-powered sprinkler controller which started exhibiting strange behavior this summer. This is a basic four-station controller paired with RainBrid ...
- 11
0
votes
2
answers
71
views
How to get a smooth operation of multiplexed solenoids
My project involves 100 small solenoids, that I either have drive individually, or hopefully I can drive in a multiplexed configuration, the same way LED displays are driven. Then I only need 20 ...
- 133
0
votes
1
answer
199
views
Diode in parallel with AC solenoid valve
I have a circuit I'm trying to design to fire both 120VAC and 24VDC solenoid valves. We have relays that work on 12vdc for the coil, and can switch AC or DC. the valves are normally around 30W. I ...
- 137
1
vote
1
answer
94
views
Is it possible for a flyback diode to increase solenoid temperature?
I have a circuit with solenoids (rated at 12V 1A), and I am controlling them via an N Channel MOSFET with an overdrive function to keep them cool, since that is my main issue. Initially, I had put a ...
- 11
0
votes
1
answer
186
views
Controlling a solenoid valve with a relay and a 18650 battery
I have a 12 V 18 W (1.5 A) solenoid valve that I want to control valve with an RF relay.
I use a Sony 18650 li-on battery to power this system. A 1S 10 A BMS unit is protecting the battery.
Even ...
- 1
4
votes
2
answers
1k
views
Do pumps and motors also need flyback diodes?
So my question is simple, we know that its good practice to use flyback diodes in solenoid valves and relays, but do pumps and motors also need them as they also have coils?
5
votes
3
answers
2k
views
Selecting a flyback diode
According to the schematic below , where J15 connects to solenoid B11HD-255-B-3 and solenoid B11HD-255-B-3 is rated 19V, 90W, what is the technical approach to selecting a flyback diode? (D15) I have ...
- 77
2
votes
4
answers
890
views
Does a flyback diode have to be connected to the + lead of a solenoid, or can it go directly to the power supply?
I am designing a control box to switch 24V DC high speed solenoids at a max frequency of 200Hz. They will be controlled by an Arduino Mega through N channel, rfp30n06le MOSFETs.
Here is a photo of the ...
- 21
0
votes
2
answers
241
views
how to choose diode for PWM of high amperage solenoid?
I'm making a pulseable solenoid circuit via PWM at around 20 hz.
THe solenoid is a heavy industrial type that pulls a whopping 18 amps.
My snubber circuit gets hot and burns up as the current is too ...
- 229
1
vote
1
answer
723
views
DC solenoid overheat protection
I got 40 DC solenoids (12 V, 2 A) and each solenoid may be turned on for max. 5 seconds every couple of minutes or even more. Does this implementation require that an overheat protection should be ...
- 45
0
votes
1
answer
82
views
No Current Flowing From 12v Solenoid Pins
I have recently designed my first PCB (forgive my poor understanding of electronics) and I'm having an issue with the pins that are supposed to be powering the 12v 2A solenoid.
Everything works as ...
0
votes
0
answers
56
views
Solenoid flyback considerations in this pFET/nFET inversion circuit
I am trying to combine FETs, where logic permits, to reduce the size of a pcb. Is it poor practice to have the pFET's gate and nFET's drain shared by an inductive load that will usually be grounded ...
- 73
10
votes
5
answers
2k
views
MOSFET broke after attaching capacitor bank
I have a solenoid that has a coil resistance of \$0.3\Omega\$ and accelerates a steel projectile here. I've posted the schematics below.
Normal Version that acts as a control
The GPIO8 goes to 5V to ...
user229515
1
vote
1
answer
648
views
Choosing the right (flyback) diode to stop contacts (points) arcing (sparking) on solenoid (relay)
Clock with a simple electric remontoire, consisting of a solenoid, with an arm, that kicks back the main spring, rewinding it.
Solenoid coil data:
operating voltage: 12V-15V
measured resistance: ...
- 13
1
vote
1
answer
434
views
Proper Flyback Current Protection Circuit for Variable Voltage Solenoid Driver
I am using a darlington buffered op-amp to drive a solenoid motor at variable voltages (for variable speeds of actuation). Here is my circuit as it is now:
I am wondering which of the two flyback ...
- 151