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LMCCN Texas Instruments Timers & Support Products A LMCCN/ NOPB datasheet, inventory, & pricing. LMCCN. LMCCN Note: See Mil-datasheet MNLMCX for specifications on the military device LMCJ/ LMCMOS™ is a. Note: See Mil-datasheet MNLMCX for specifications on the military device LMCJ/ LMCMOS™ is a trademark of National Semiconductor Corp.

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How long to you want this timer to work in secondsand what are you using to trigger it a push button? After re-reading my post it looks like I completely darasheet to mention how I’m going to use the timer!!

The supply current spike from a Cmos operating at your low supply voltage is tiny compared to the up to mA supply current spike caused by an ordinary An ordinary has an output high voltage spec’d with an output current of mA when its supply voltage is only 5V.

There’s times when I just datahseet quite explain things simply and something tells me this could be one of those times so apologies if llmc555cn the case!! Jun 23, 1. I’m hoping I’ve included enough info here but if I’ve omitted anything let me know!!!

Help/advice with timer circuit | All About Circuits

HELP with timer Posted by itel in forum: Hi Bill, thanks for the extremely quick reply!! The Cmos has a very low output high current especially when its supply voltage is only 5V.

Your dagasheet or email address: Thanks again for taking your time to reply! No, create an account now.

Help with making a timer circuit Posted by paulareno in forum: The idea behind this circuit is to automatically cue slides for presentations. Also, if there is an easier way to accomplish the same task please let me know I’m all ears!!!

Or will there be something I need to add such as a resistor to ensure the SSR does turn off? Jul 22, 10 0. How to Reduce Ground Bounce: Also, which type of capacitors should I be using for my project – tantalums, ceramic or electrolytic datashedt I am a complete novice!


You May Also Like: Posted by nodestination1 in forum: I’m attempting to make up a circuit that will trigger a key press on a keyboard with the help of a solid state relay. Malware on Android Devices Mimics Hardware Specs and Wastes Billions of Dollars Ever wonder why so many Android apps ask users if they’d like to download obscure add ons like “smart charging”?

Jun 23, 3. For R1 I’ve decided to use a variable resistor finding a Jun 23, 2. datwsheet

LMCCN/NOPB – Texas Instruments – PCB Footprint & Symbol Download

Its output high voltage is spec’d with an output current of only 2mA which might not be enough to turn on your solid state relay. So in a nutshell, my plan is to make this timer press the space bar at predetermined intervals Hopefully I haven’t made things more confusing than they were before!! So far, after about 2 days trawling through both Google here for inspiration I’ve come up with the circuit below but with a few modifications.

I’m trying to get the output to go low for 3 to 10 seconds which I’m hoping can be tweaked by the potentiometer and then I’m aiming for a mS duration for when the output goes high I pulled this figure out of thin air as I’ve really no idea how long to make the simulated key press – it just seemed to fit! Hi all, First up, my apologies for another thread as I can’t find a similar thread to tag onto I have to admit I did have a moment of horror when you mentioned the 2mA output current – I just checked the datasheet of the SSR and found that the stated maximum forward current is 2mA I had originally thought it was 3mA hence my brief moment of panic!!!


Usually you would just set the slides to automatically advance and set them to loop. Mar 24, 21, 2, You gave a lot of info, but I have to admit I’m still confused, so break it down. I’m planning on having 2 relays in series – one will trigger and simulate the space bar being pressed, one relay will light up an LED and the other will simply just close an external circuit for external expansion one of these relays are a dual SPST relay hence 2 relays!

Once the circuit is powered it will then be left alone maybe for a couple of hours without any further intervention.

Jun 23, 4. As the power is being tapped off the USB port datasgeet parallel to the keyboard am I guessing correctly that it would be a good idea to include this bypass and, if so, what capacitor should I use? I’ve attached a schematic of the actual circuit below but without a few modifications that I’ll mention later. Datsheet isn’t to improve your user experience. Jun 23, 5.

Yes, my password is: Help with timer circuit please!

National Semiconductor

After sifting through the datasheet of the a few times I can’t find any mention of the maximum output current so from here onwards it’s 2mA! Essentially, I’m taking a keyboard PCB and attaching the corresponding contacts for the space bar to a solid state relay. Quote of the day.

I’ve lost track of what I’ve read where but I did read something about having a capacitor as a supply bypass due to spikes from the when it changes state. Do you already have datsheet account? Dec 20, 10, 1,