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Thanks guys, much appreciated. This is for mouting a device to a residential ceiling. Other than side grain, I won't know much else about the conditions. The load is continous, permanent (load hanging). I presume it won't get wet, Temperature will vary, could be joists in an attic or a...

Hi guys: I need to find some data on typical pullout strength values for #10 screws into wood (SYP). I'm makign a device that has to be hung from a ceilign and need to document/confirm the screw selection. Thanks, Scott

Well, FWIW, I shorted the thing and it promptly blew a 1.6A fuse even though the PS isn't rated that high. The circuit isn't pulling that much so at least the PS is putting out enough to pop a fast blow fuse.

Here it is: http://www.cincon.com/pdf/tr30r.pdf I can't tell.

Hi guys: The Wall wart is regulated pretty well, and it does have short protection. What Gunnar described is exactly what I gathered as teh problem when I started looking at teh datasheets for the fuses. If the PS can't give more than 1.5, then a dead short in the circuit wont' pull enough to...

Thanks. I'm kinda in the middle. It's a replaceable fuse, but not generally accessable. What about sizing same fuse. The device uses 1.5A (well really about 1.1), shoudl I just use a 1.6A fast blow? I don't know anything about sizing them and teh charts on the datasheets made me worry if I...

Thanks guys. 1. The board is done so I'd prefer to stay with a Diode and Fuse, but ti's not mfgr's yet so a minor change wouldn't be a big deal. 2. I don't have to have an indicator that the user wired it wrong, but it woudl be good. Of course having it so they can't screw it up would be...

I have a small circuit, powered by a 24VDC 1.5 amp regulated AC/DC "wall wart". I need to protect my circuit against a user wiring it backwards. A blowable fuse is fine. I planned to put a fuse and a diode across teh input terminal, but I'm not sure what size of each to place. Seemed...

Will do.

Thanks Keith and all. Help much appreciated. It's a plan then. I did run some calcs with a pre-resistor and found that it casued the Pd in the LM340 to be in the 40mW range whether it was sourcing 12mA or 2mA, so at you guys original suggestion I believe I will add a 1.3k 1/2w resistor in...

OK guys, I've been trying to do my homework on this. After this conversation I got worried about the regulator glowing red :). Sanity check my work here: Parameters refresh 24v source, need 5v output Load current requirements: uP: < 1 mA IR rcvr: = 1.5 mA Call the total 2mA to be safe No...

Thanks Rich, RS has all but stopped carrying anything electronic. But I've got regular accounts with Digikey and Mouser, so no problem there. But it will be a munumental feat to get the TO220 to the alu structure anyway. Was just a thought..

Thanks guys. Not being an EE I never thought of adding a resistor in series to cut the load on the regulator. Sounds like a plan. The (plastic) case that this circuit board is in is mounted to a huge block of aluminum (the machine being controlled). I need to consider a way to mount these...

Thanks sreid: You (or anyone) have time to take a quick look at teh datasheet for the IR receiver? I'm not sure I'm reading the right current for it's normal state of operation. I might not need 10mA, but only 1.5mA, or less. Thanks again, Scott

> 2 resistors :) Sarcasm is OK. I'm a machine person, not an EE so I don't mind even a llittle. 2 Resistors would indeed be a spiffy solution if it would work. So let's see: thru-hole preferred, can do SOT-89 but hand soldering so don't want to go smaller if possible. current need...

Hi guys: I need to power a PIC 16F628A from a 24v source. The 24v source normally controls a integrated step motor driver/controller and I'm using the PIC to turn that module on and off. Is a regular ol' 7805 type TO-220 the only option? Is there a better, or I should say, smaller way...