© Copyright © January 28th 1996 - 2009 ..... Brought to you by Unitech Electronics Pty. Ltd.

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              A Variety OF simple NE-555 timing circuits to " tinker " WITH.
              These are kept deliberately simple and yet functional.


 
   Please note, the NE-555 chip chosen for these experiments is in fact Made by the original company, Signetics on the 25th week of 1977. 
   This chip (as of today september 23rd 2009) is 32 years old. Not bad for a 32 year old chip fabrication technology and  manufacturing 
   and still working today. We had 12 NE-555 chips (discovered) hidden away in a box, since 1977, all were fully tested and found to be good.
   We also tried various other brands and arrived at similar conclusions and results. Brands tested were Motorola, Fairchild and National 
   Semiconductor, MOS Technology and Texas Instruments, all tested chips displayed same characteristics of the original Signetics NE-555.
4 NE555 CONFIGS.gif

NE-555 Front Breadboard Pic 


                        Click on the NE-555 chip and watch the circuit above come to life !
NE-55-VIDEO 

                        Click on the NE-555 chip and watch the circuit above come to life ! 3.88 MB wmv file

NE-555 Rear Breadboard Pic

NE-555 Rear Breadboard Pic

NE-555 8 Min Timer CCT Pic

NE-555 2 minute timer

NE-555 12 minute timer

NE-555 5 minute 50 timer

NE-555 TIMED PLOTTED

NE555 Data 

 
         As the voltage ( in this case about 6.07 Volts ) reaches 2/3 of supply input to pin 8, ( 9.00V ) the NE-555 resets and pins 6 and 7 reverts 
         back to zero Volts ( well, almost ) about 0.21 volts was measured. Using C1a 100uF + C1b 220uF = 320uF + VR1 1Meg Ohm + R1 12K ohms.
         C1(a) = 100uF +C1(b) = 220uF (totalling 320uF) with VR1=1 Meg Ohm + R1=12K ohms, Reset time = 7 minutes and 8 seconds. Supply = 9.00 volts DC.
         Noted readings for straight C1 = 220uF with VR1 = 1 Meg Ohm + R1 = 12K ohms ( 1,012,000 ohms ) = 5 minutes and 50 seconds. Supply = 9.00 volts DC.







                        Click on the NE-555 chip and watch the circuit above come to life !


NE-55-VIDEO


                        Click on the NE-555 chip and watch the circuit above come to life ! 3.88 MB wmv file







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Layout is Copyright  © 1996 Unitech Electronics Pty. Ltd.  ALL RIGHTS RESERVED.

Last updated: January 28th 1996
Added PDF access references: September 21st 2009
Added 3 NE-555 pictures: September 23rd 2009