Electronics > Projects, Designs, and Technical Stuff

Need some help building a circuit involving switchs and relays

(1/14) > >>

Shaydzmi:
I need some help and suggestions to build this circuit:

It has 4 sections, and a board with relays, which lacks components needed to operate the relays.

How it works :

Section1 : When one of the 84 switches closes, Relay1 should operate.

Section2 : When one of the 84 switches closes, Relay2 should operate.

Section3 : When one of the 3 switches closes, Relay3 should operate.

Section1 : When one of the 3 switches opens, Relay4 should operate.

Power supply : 6Amps max
Lamps: 24v 1.2w

https://i.ibb.co/QD7zR60/cats-vert2.jpg

Benta:
"Section 4" seems to be a short circuit???

themadhippy:
Hope you dont intend all the lamps being on at once coz 6A aint gonna be enough,as to a solution any one make a 84 input OR gate?

Ian.M:
Full wave rectify the supply to all the lamps and switches so they are running on unsmoothed DC so you can use diodes to implement the two 84 input, and single three input OR gates required.  Use 24V DC coil relays, and if they chatter, add just enough capacitance across each coil to hold up the coil voltage through the zero crossings.  Don't use too much capacitance, as in the limit, it will increase the average coil voltage by a factor of  up to 1.4 and cook the relays!

As Benta has pointed out, section 4 wont work as drawn.  Either swap the thee NC switches in series to three NO switches in parallel, with the whole switch group in series with the relay 4 coil, or put the coil in series with the NC switches, and wire the contacts based on its normal state being energised and releasing on any button press, or use an extra relay to energise relay 4 when it releases, or (assumiong DC supply) use a transistor, a couple of resistors and a diode to implement an inverting driver for the relay 4 coil controlled by the three NC switches.

N.B this all assumes you've either got access to *BOTH* ends of the transformer secondary supplying the 24V AC, or can rewire the ground side of all the lamps to the negative terminal of the bridge rectifier.  If not, so all you've got is ground-referenced AC, it gets a *LOT* harder . . .

Shaydzmi:
In some cases, they will bi lit all of them, maybe I need some thing that can cut the power when it reaches the maximum current, but in the same time keeps the relay energized.

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod