Micro electronics - stop 12V 9A in reverse direction?
- Thread starter Lisapete
- Start date
I've tried this and it works in the relay selection.
I only tried with 2 LEDs and relays.
When you select the circuit with relay you want both LEDs light up. Soon as I removed the earth it goes out.
Reverse current? What can I do.
edit: scrub what I was thinking, the circuit is just flawed... there will be a better way to wire this
edit edit: You would need to add diodes on each of the coil outputs before running to switch, or if you used small enough relays you could be sneaky and use the LEDs themselves to feed the relay coils to stop the current flowing back through all the other LEDs.... though the back EMF on the coils would prolly take out the LEDs
Last edited:
Just a cheap and cheerful 1N4001 in series with coil will stop the other LEDs lighting.
Back EMF is a high voltage caused when relay coils collapse... In a circuit with semiconductors you usually put a diode across the coil to stop it. I wouldn't worry about it though
Sorry for my laymans terms I'm very rusty with electronics and there are probably better people on the forums
Back EMF is a high voltage caused when relay coils collapse... In a circuit with semiconductors you usually put a diode across the coil to stop it. I wouldn't worry about it though
Sorry for my laymans terms I'm very rusty with electronics and there are probably better people on the forums
http://www.maplin.co.uk/p/1n4001s-1a-silicon-rectifier-ql73q
Before or after the relay coil?
Relays I am using are 40A 12V 4 pin type found in your car.
Off to get them now and food shop so will report back
Working perfectly! Think I might make a small bit of veroboard with the diodes fitted and the corresponding colored cable from the relay to the diode then to the launch button. This make's all the diodes safe on the mounting side of things. Easy to fix if needs be, easy to build.
Okay so how how i add a switch (toggle single switch) that would arm them all? ie flick the switch all LED's light up and all relays will trigger once the push button/launch button is pressed?
Okay so how how i add a switch (toggle single switch) that would arm them all? ie flick the switch all LED's light up and all relays will trigger once the push button/launch button is pressed?
12+ to one side of the toggle switch. other side of the toggle switch to all the anodes of 12 moren (or however many channels you have) diodes, cathode of each diode to each position on the rotary switch
Got it working. Brilliant thank you.
I honestly can not thank every one enough in here.
Last edited:
Not a lot, it should just work as the 1N4001.
Cool beans, think I've had power go back and blow a few so trying to prevent by going bigger
Checked and rechecked