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Relay question (adding relay to Oscars LED driver board) - it works!
JoyMonkey:
Thanks Randy! Once again, you're my hero! :P
RandyT:
Make sure you go back and re-read some of the posts. The edits were flying on this one ;)
RandyT
Popcorrin:
--- Quote from: SirPoonga on June 14, 2005, 05:30:23 pm ---Cool, tha tmakes sense.
So, to answer my other question.
--- End quote ---
Popcorrin:
--- Quote from: RandyT on June 14, 2005, 05:32:06 pm ---
--- Quote from: JoyMonkey on June 14, 2005, 05:26:18 pm ---One last question (then I'm done, I swear). I'm not too good at figuring correct resistor values, so what if I removed that resistor and LED completely, what would I connect relay point B to on the LED driver circuit?
--- End quote ---
You may want to put a current limiting resistor in between the B connector and ground.
--- End quote ---
RandyT:
--- Quote from: Popcorrin on June 15, 2005, 10:07:23 am ---This particular relay is only rated at .5amp. Depending on how much your pinball solenoid draws you may need something rated a little higher.
--- End quote ---
Here's the "other" spec sheet on that relay:
--- Quote ---Compact 1-amp SPST Reed Relay
(275-0232) Specifications Faxback Doc. # 35144
Coil: ......................................................... 5 VDC
Coil Current: ................................................. 20 mA
Pick up Voltage: ...............(70% max)................... 3.75 VDC
Drop Out Voltage: ...............(10% min)................... 0.5 VDC
Max. Voltage: ............................................... 7.5 VDC
Coil Resistance: ........................................... 250 Ohms
Temp. Rise: ........................................ 30 degrees C Max
Operate Time: .............................................. 1.5 mSec
Release Time: .............................................. 1.5 mSec
Service Life: ............................ 5,000,000 Operations @ 1 A
Contact Rating: ............................................... 1 Amp
1 Watt
125 VAC
Contact Resistance: .................................. 150 milli Ohms
(EB 10/25/96)
--- End quote ---
It shows a 1-amp at 125volts AC rating for the contacts. Maybe the half amp rating is for DC?
But based on the other specs, I stand corrected as it appears to handle even less than .5 amp. It calls out the power switching spec at only 10 watts!
That would mean that the 30v solenoid (if that's the voltage the solenoid is driven with) could draw only 1/3 of an amp to be used with this relay. But without knowing the specs of the solenoid, it's hard to say what it draws. There's also the fact that the solenoid won't really be doing any "work" as a "knocker", just slamming into the wood to make a noise. So, the current used would just be enough to momentarily push the rod out of the coil. I think the current requirement goes up with higher resistance againt the actuator, but this stuff isn't my forte' :)
RandyT
BTW, SirP, will gravity be used to reset the rod or is there a spring loaded return?
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