Guess

Trinity · 26th Jan 2008, 12:57 AM

Plus rep to whoever can guess what I made this for.... many years ago.

peaz · 26th Jan 2008, 01:23 AM

Hmmm two LED lights blinking with fitted with a battery. The variable resistor controls the frequency?

Googled the chip and found that it's a dual input nand gate.

Trinity · 26th Jan 2008, 01:25 AM

Close...

But no.

Try again.

PsYkHoTiK · 26th Jan 2008, 02:27 AM

I reckon that its for that flash light LED. The Luxion star one I believe? Didn't you leave it running for quite a while?

zy · 26th Jan 2008, 02:28 AM

fan controller? lol

peaz · 26th Jan 2008, 10:26 AM

Hmmm beeping sound?

NAND Gates, variable resistors...
Something that on-offs at the frequency that's adjustable eh?

The_YongGrand · 26th Jan 2008, 04:34 PM

Thatchip is a CD4011 ... quad 2-input NAND gates.

That configuration could be an astable multivibrator (example: typical blinking/flashing lights) or either a PWM (pulse-width-modulation) controller set (for the fans, lights, whatever) to save energy and battery life. Some modern ultra-bright torchlights actually use PWM if I'm not mistaken except they wouldn't use a CD4011 chip or a 555 for it, but with the classic 2-transistor, 2-capacitor network.

If I'm correct about the astable multivibrator thingy... well, this thing also function as a bleeper. You also can make a little electronic organ out of it... but it squeezes out square waves... so the sound could be a (little) bit rough.

Trinity · 26th Jan 2008, 07:35 PM

Peaz, The_YongGrand,,, Correct! A buzzer!

I made the thing back in the 80's. I found it while I was looking thru some old stuff, So I got it out to see if it still worked, Chip was dead.(RIP 4011)...

I had a spare, so I popped it in and it works again.

I have it hooked to a piezo element, And adjust it to put out "super" hi pitch. What for you ask... I used to take to school and turn it on in class. It was fun to see some of the other kids look around to see where it was coming from but no one could tell.

The_YongGrand · 26th Jan 2008, 07:41 PM

Quote:

Originally Posted by Trinity

Peaz, The_YongGrand,,, Correct! A buzzer!

I made the thing back in the 80's. I found it while I was looking thru some old stuff, So I got it out to see if it still worked, Chip was dead.(RIP 4011)...

I had a spare, so I popped it in and it works again.

I have it hooked to a piezo element, And adjust it to put out "super" hi pitch. What for you ask... I used to take to school and turn it on in class. It was fun to see some of the other kids look around to see where it was coming from but no one could tell.

Wowzers... I didn't know that you can actually make an astable multivibrator from NAND gates. Only thing I can make now is using a 555 timer, 2-transistor-2-capacitor system and even op-amps! Well, I haven't really learned Digital Electronics in my college yet, so I'm not pretty familiar with the gates.

Other than the buzzer, if you know how to hook it up to a few switches, some variable resistors and some capacitors, you can actually construct a mini-organ (but that one doesn't sound that pleasent - just like those cheap 99¢ kiddy toy organs you find in the store), or even the PWM controller set.

I'm wondering could I make two of these, turn them into some sort of organ, and connect these outputs to the op-amp summing amplifier and make polyphonic sounds?

trin - did you study electronics in college, or just a hobby?

edit: Wow trin - your writing is really neat!

Trinity · 26th Jan 2008, 08:45 PM

Oh, it was/is a hobby.

BTW, That's not my writing. It's from this book. Amazon.com: Forrest Mims Engineer's Notebook: Books: Forrest Mims

Learned most of what I know from it. A real cool book if you like messing with basic electronics.

26th Jan 2008, 01:23 AM	#2 (permalink)
peaz ARP Webmaster Join Date: 13 Oct 2002 Location: http://atpeaz.com/ Posts: 8,595 Reputation: 1673 Rep Power: 32	Hmmm two LED lights blinking with fitted with a battery. The variable resistor controls the frequency? Googled the chip and found that it's a dual input nand gate. __________________ Ken Ng Tech ARP Follow me at Twitter Blogs @ http://www.atpeaz.com/

26th Jan 2008, 01:25 AM	#3 (permalink)
Trinity Little Kiki Join Date: 5 Jan 2003 Location: Ohio,usa Posts: 7,249 Reputation: 6033 Rep Power: 75	Close... But no. Try again. __________________ (\__/) (-. - ) (> < )

26th Jan 2008, 02:27 AM	#4 (permalink)
PsYkHoTiK "Little" Devil Join Date: 8 Apr 2004 Location: On the "throne" Posts: 14,746 Reputation: 4681 Rep Power: 66	I reckon that its for that flash light LED. The Luxion star one I believe? Didn't you leave it running for quite a while? __________________ Intel SLBEJ @ 4GHz : 3x2GB OCZ Platinum DDR3 1600 : Asus P6X58 Premium : WD RE3 250GB x2 RAID 0 : 3ware 9650SE-2LP : XFX Radeon 5850 : XFi Platinum : Silverstone OP650 : Silverstone TJ-07 : Swiftech Apogee XT : MCP655 : Thermochill PA120.3 w Scythe Ultra Kaze CPU-Z: SLBEJ : SLAPL : SLA9U : FX-55 : DDR 600 : VX www.techarp.com

26th Jan 2008, 02:28 AM	#5 (permalink)
zy zynine.com Join Date: 16 Dec 2002 Location: Buffalo NY Posts: 13,495 Reputation: 2276 Rep Power: 43	fan controller? lol __________________

26th Jan 2008, 10:26 AM	#6 (permalink)
peaz ARP Webmaster Join Date: 13 Oct 2002 Location: http://atpeaz.com/ Posts: 8,595 Reputation: 1673 Rep Power: 32	Hmmm beeping sound? NAND Gates, variable resistors... Something that on-offs at the frequency that's adjustable eh? __________________ Ken Ng Tech ARP Follow me at Twitter Blogs @ http://www.atpeaz.com/

26th Jan 2008, 04:34 PM	#7 (permalink)
The_YongGrand Hyperactive Join Date: 12 Feb 2005 Location: Somewhere in 甲洞... Posts: 2,880 Reputation: 1187 Rep Power: 19	Thatchip is a CD4011 ... quad 2-input NAND gates. That configuration could be an astable multivibrator (example: typical blinking/flashing lights) or either a PWM (pulse-width-modulation) controller set (for the fans, lights, whatever) to save energy and battery life. Some modern ultra-bright torchlights actually use PWM if I'm not mistaken except they wouldn't use a CD4011 chip or a 555 for it, but with the classic 2-transistor, 2-capacitor network. If I'm correct about the astable multivibrator thingy... well, this thing also function as a bleeper. You also can make a little electronic organ out of it... but it squeezes out square waves... so the sound could be a (little) bit rough. __________________ Intel Core 2 Duo E7200, 2GB DDR2-667 RAM, Gigabyte 945GCMX-S2, Sapphire ATi Radeon HD4850 512MB DDR3 Intel Pentium Dual Core E2140, 2GB DDR2-667 RAM, Asus P5B-E Plus, nVidia Geforce 7950GT 512MB DDR3 Last edited by The_YongGrand : 26th Jan 2008 at 04:40 PM.

26th Jan 2008, 08:45 PM	#10 (permalink)
Trinity Little Kiki Join Date: 5 Jan 2003 Location: Ohio,usa Posts: 7,249 Reputation: 6033 Rep Power: 75	Oh, it was/is a hobby. BTW, That's not my writing. It's from this book. Amazon.com: Forrest Mims Engineer's Notebook: Books: Forrest Mims Learned most of what I know from it. A real cool book if you like messing with basic electronics. __________________ (\__/) (-. - ) (> < )

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