Maker Pro
Maker Pro

Switches and diodes

is_that_smoke

Nov 19, 2016
2
Joined
Nov 19, 2016
Messages
2
I have a SP 2 way retractive switch centre off that operates points on a model railway I’m building these only require a momentary pulse to change over. I want to add indicator lamps to this and have some pulse operated change over latching relays so they would give me a permanent supply to the indicator lamps. I have tried this and it works.

I was wondering if I can supply these from the same switch and if so what type of diode can I fit to stop the supply coming back onto the opposite switch terminal and triggering the points.

I have sort of done a drawing I hope helps explain.

The relays can use anything from 3V – 12V to latch so any volt drop across the diode is not a great problem.

points and relay switch.png
 

Arouse1973

Adam
Dec 18, 2013
5,178
Joined
Dec 18, 2013
Messages
5,178
I am assuming the common connection also switches over? What current does your relay draw, do you know?
Thanks
Adam
 

is_that_smoke

Nov 19, 2016
2
Joined
Nov 19, 2016
Messages
2
Adam.
Only the positive line switches.
The relay coils have there own power supply, the trigger line is only a signal to the board to fire the relay so I would assume only mA's picture of relay board below.
 

Attachments

  • 71XxdEgmQWL._SL1010_.jpg
    71XxdEgmQWL._SL1010_.jpg
    132.6 KB · Views: 46

Arouse1973

Adam
Dec 18, 2013
5,178
Joined
Dec 18, 2013
Messages
5,178
Ok. Well current is measured in mA but how many. Whats the part number on the relay?
Thanks
Adam
 

tedstruk

Jan 7, 2012
476
Joined
Jan 7, 2012
Messages
476
what you are talking about is first year electronics. they are called schottky(pronounced SKOT-KEE) diodes and they are used between the signal and ground. feel free to corrent my feeble brain...
 
Top