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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Also, which type of capacitors should I be using for my project – tantalums, ceramic or electrolytic as I am a complete novice!

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. 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, 1. There’s times when I just can’t quite explain things simply and something tells me this could be one of those times so apologies if that’s the case!! Jun 23, 5. Yes, my password is: The Cmos has a very low output high current especially when its supply voltage is only 5V.

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 Help with timer circuit please! Jul 22, 10 0.

Its output high voltage is spec’d with an output current of only 2mA datasheeg might not be enough to turn on your solid state relay.

I’ve attached a schematic of the actual circuit below but without a few modifications that I’ll mention later. I’m xatasheet to make up a circuit that will trigger a key press on a keyboard with the help of a solid state relay.

The idea behind this circuit is to automatically cue slides for presentations. Your name or email address: Or will there be something I need to add such as a resistor to ensure the SSR does turn off? Hi Bill, thanks for the extremely quick reply!!


For R1 I’ve decided to use a variable resistor finding a Once the circuit is powered it will then be left alone maybe for a couple of hours without any further intervention.

LMCCN Datasheet(PDF) – National Semiconductor (TI)

Dec 20, 10, 1, Do you already have an account? 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!!!

How long to you want this timer to work in secondsand what are you using to trigger it lmc555cn push button? 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!!

It isn’t to improve your user experience. Datasjeet you would just set the slides catasheet automatically advance and set them to loop.

So far, after about 2 days trawling through both Google here for inspiration Datadheet come up with the circuit below but with a few modifications. Help with making a timer circuit Posted by paulareno in forum: No, create an account now.

National Semiconductor

Hi all, First up, my apologies for another thread as I can’t find a similar thread to tag onto Essentially, I’m taking a keyboard PCB and attaching the corresponding contacts for the space bar to a solid state relay. 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!


Jun 23, 4. Posted by nodestination1 in forum: Quote of the day. How to Reduce Ground Bounce: An ordinary has an output high voltage spec’d with an output current of mA when its supply voltage is only 5V.

I’m hoping I’ve included enough info here but if I’ve omitted anything let me know!!! 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!

Thanks again for taking your time to reply!

Help/advice with 555 timer circuit

HELP with timer Posted by itel in forum: Jun 23, 3. You gave a lot of info, but I have to admit I’m still confused, so break it down. Mar 24, 21, 2, You May Also Like: Also, if there is an easier way to accomplish lmc5555cn same task please let me know I’m all ears!!!

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!

As the power is being tapped dtasheet the USB port in parallel to the keyboard am Datassheet guessing correctly that it would be a good idea to include this bypass and, if so, what capacitor should I use? Jun 23, 2. After re-reading my post it looks like I completely forgot to mention how I’m going to use the timer!!