PDA

View Full Version : 24v quick question



docjon
12-11-2009, 11:33 PM
Hey guys,

During the year i converted all my 24v ssr's to 240v for work, i now need to change them back to 24v and can't remember what ohm resistor to use.
Can someone tell me what ohm resistor do i need to us for 24v operation of the ssr's?

Thanks
Brenton

daviddth
12-11-2009, 11:38 PM
330 Okm for 240V, 33 Ohm for 24V from memory.

aussiephil
12-16-2009, 07:57 PM
David's spot on

33R is fine at 24v, anything from 22R to 47R will work

daviddth
12-17-2009, 01:38 AM
actually 120 ohm will also work - I used it on my 595 powered stripboard SSR's for last year & they dimmed ok, but were a little scratch at low dimming levels, but on/off were great

wjohn
12-19-2009, 09:21 AM
The Math suggests 33R for 24VAC, I just use 180 ohm as it was easy to standardise.

christmas-light
12-19-2009, 11:17 AM
Hey guys,

During the year i converted all my 24v ssr's to 240v for work, i now need to change them back to 24v and can't remember what ohm resistor to use.
Can someone tell me what ohm resistor do i need to us for 24v operation of the ssr's?

Thanks
Brenton

I use 330 ohm for both 230 v, 12 v and 24 v and they work great

daviddth
12-19-2009, 05:23 PM
I found that 330 ohm on 24V was a hit and miss setup - some worked perfectly, some worked but would not dim, others flickered but would not light properly