All Questions
17
questions
12
votes
6
answers
3k
views
Second opinion on PCB design for relay made in Altium
Edit: I have added the updated PCB design at the bottom over this post (for anyone curious about the progress)
And a big thanks to everyone who commented, it really helped me out a lot!
Original ...
- 137
0
votes
0
answers
51
views
Verify the correctness of a circuit: AC to DC conversion for Arduino Nano and relays
I need your opinion about the correctness of my circuit. As is shown in the drawing schematic, the circuit is supplied by 220 VAC which will be converted to 12 VDC. This output is used to supply the ...
- 1
1
vote
0
answers
41
views
Powering up an AC-DC power supply under load
Is it safe to power up a AC-DC power supply while it is connected to a load?
Specifically what I'm trying to do is replace an AC espresso water pump with a 24V/2A Brushed DC water pump. Additionally a ...
- 11
0
votes
1
answer
64
views
AC to DC conversion speed
I am using a relay and an arduino to quickly turn on and off lights for a Christmas light show. So far all of the lights have been AC power. However I just got a snowman that runs on 12v DC power ...
2
votes
2
answers
232
views
AC-DC power supply burning relays
I use an Arduino to control a relay. This relay is on an 8-relay board. The relays are rated at 120 VAC, 10 A.
This relay powers on and off an AC-DC power supply. It has 110 V AC input and is rated at ...
- 23
0
votes
2
answers
242
views
24V Bridge Rectified Relay Circuit blowing L7805 & PIC18F
I've got a circuit which is powered using a 24VAC transformer fed into a KBU606G full bridge rectifier to generate 24VDC. Originally there was a 470uF smoothing capacitor, however I was unaware that ...
- 11
0
votes
1
answer
180
views
Can I get power from my Thermostat's AC relay wires?
I have a 2-wire thermostat that activates my baseboard heater when the 2 wires are shorted. I did an experiment closing those two wires with a relay and got that working well with an ESP32 as the ...
- 3
1
vote
2
answers
878
views
Power drop on AC-DC converter due to relay
A uController circuit is powered with an AC-DC converter. This circuit in turn acts on some relays to turn on and off some loads. We have two bi-stable relays and another simple relay (Omron G5DN-1A) ....
- 11
2
votes
1
answer
768
views
AC-DC converter (230V - 5V) supply for microcontroller to control outlet
I have built a circuit using a PBO-3-S5, AC-DC circuit and applied some necessary components. iIn the description and when testing the circuit I get a 4.8V output voltage which should be enough to ...
- 29
1
vote
1
answer
252
views
Relay-controlled Fan Transient Question
Greetings guys and gals,
I am seeing some odd behavior in my PIC-controlled circuit and need some help from the experts. I have a PIC18 at 3.3V turning on a bathroom vent fan via a relay.
The fan ...
- 11
-1
votes
1
answer
953
views
Close/Open circuit based on power supply to a relay [closed]
I am new here and to electrical world. I need to resolve a very basic real life issue. I have two fans in my bed room. One is AC and the other one DC powered by a lead acid battery. I want the DC fan ...
- 109
0
votes
1
answer
935
views
Will the use of an AC relay keep my power supply isolated?
An isolated power supply is used to convert 120 VAC 60Hz power from mains to 12V. A linear voltage regulator then converts the 12V to 5V.
A 5V micro-controller is then used to switch on a 12V relay (...
user41391
2
votes
1
answer
155
views
Transformer and a relay in series - but function like in parallel, but not exactly
I've been doing some planning to build a home automation system on top of the existing power infrastructure of my house.
The first thing would be making my light switches smart. My original plan is ...
- 163
1
vote
0
answers
67
views
Why do some Arduino relay modules can handle up to 250 VAC but not above 30 VDC? [duplicate]
When you look for "Arduino relay module"s, you usually see one form "SONGLE" that says on it:
10A 250 VAC 10A 125 VAC
10A 30 VDC 10A 28 VDC
My question:...
- 426
0
votes
1
answer
673
views
Relay that detects 240VAC and switches 12V DC
I'm wishing to detect the loss of AC power (in this case 240V) and when this event occurs have a 12V DC circuit go to earth. This will trigger an alarm for users to react to situation.
Can anyone ...
