Linked Questions

2
votes
2answers
209 views

Question about this diagram [duplicate]

I am very much a software person and a rookie in electronics. I am trying to understand why do we need Diode D1 in the diagram explained in this post: http://www.susa.net/wordpress/2012/06/...
0
votes
2answers
677 views

Why should a diode be placed parallel to the coil? [duplicate]

I'm looking at connecting relays, In the schematic found on this site, the diode is placed in parallel. Why would this be the case? If the diode is there to circumvent large voltage flow back, wouldn'...
-2
votes
1answer
173 views

Where to place a diode - DC 12v motor controller [duplicate]

I'm building a controller for a DC motor. I'm using a 12V DC motor from windscreen wipers. Here is my circuit diagram and a video of the simulation I made. https://www.youtube.com/watch?v=...
23
votes
5answers
13k views

Why don't relays incorporate flyback diodes?

Warning: this may be an extremely naive question (if so, please enlighten me). Many applications of relays require a flyback diode to protect against inductive voltage. I'm unable to find any relay ...
6
votes
2answers
38k views

Do I need a flyback diode with an automotive relay?

I have two relays to convert +12 volt circuits to "ground" inputs into a fuel injection ECU. If I connect the relay coil ground to the same ground as the "source" will I need to install a diode to ...
9
votes
2answers
6k views

Do I need a flyback diode?

I have some experience using automotive relays and triggering them using the output from a two-way radio aux pin so I am aware of the need to add a diode in parallel with the coil to protect the radio'...
2
votes
3answers
3k views

Connecting DIODE in relay circuit

Am a very beginner with electronic circuits and its components.. Im trying to turn on my water pump using Arudino nano. Ive got 25A solid state relay for that purpose. So according to little info I ...
1
vote
2answers
3k views

Flyback diode requirements

Obviously reverse voltage has to be higher than V+, but are there specific requirements regarding speed and current? Is a 1N400x fast enough? What about a 1N4148? edit The question is a general one,...
2
votes
2answers
1k views

I am having an issue with relays sticking

I use a DL205 PLC with a Do more CPU. This drives SPDT relays to control 90 degree motor operated valves. The valves are apollo motor actuated, which advertises 0.74amp starting/locked rotor current. ...
3
votes
2answers
2k views

How does a flyback diode work?

In a previous question I posted to the exchange I asked for some instructions on trying to variable speed control a motor. Someone suggested utilizing PWM from my Arduino to open and close a ...
4
votes
1answer
2k views

The flyback diode and its applications

So in an application like this: The coil of the motor will, by Lenz's Law, induce a very large negative voltage across its terminals (without the diode in place). Would this voltage be very negative ...
2
votes
2answers
478 views

Freewheel diode / capacitor with this board?

With DC motors, it is common to put a freewheel diode and/or a capacitor in order to protect the equipment as the motor can induce current into the system. I plan to use this board to control a 24V ...
3
votes
2answers
1k views

Using logic gates instead of Arduino

I have created a very simple circuit using arduino, in which I have 4 switches used to control the lamp ON/OFF as shown in the below schematic. simulate this circuit – Schematic created using ...
0
votes
2answers
285 views

Relay current flow

I'm new to electronics. I found the tutorial about the control of a relay using GPIO in raspberry pi from http://arnholm.org/raspberry-pi-controlling-a-relay/ . It has the following electric circuit ...
0
votes
1answer
159 views

Help Me to Identify What I did Wrong with this Circuit

This is the Circuit I Built Circuit Source I Assembled this circuit and once I connect the battery, it has to turn on the Relay and supply the Current to charge the battery. but in my circuit ...

15 30 50 per page