On a sunny day (Wed, 9 Jul 2014 00:40:07 -0300) it happened YD wrote in :
That board will not pas the vibration tests.
Simplest way would be pile up 555 chips and make a stairs..
circuit challenge
Jul 08, 2014
43 Replies
With a logarithmic voltage to frequency response the frequency @ 5V would be high enough to look as steady on.
Dipl.-Inform(FH) Peter Heitzer, peter.heitzer@rz.uni-regensburg.de
HTML mails will be forwarded to /dev/null.
No problem. 554 microcontrollers and one NE555. Makes 555 chips in total :-)
Dipl.-Inform(FH) Peter Heitzer, peter.heitzer@rz.uni-regensburg.de
HTML mails will be forwarded to /dev/null.
Sorry, I forgot about the "etc..", i.e. linear response below 5V. So just add a comparator which pulls down the cathode of the LED when the voltage is above 5V.
Dipl.-Inform(FH) Peter Heitzer, peter.heitzer@rz.uni-regensburg.de
HTML mails will be forwarded to /dev/null.
Yeah, that would work. But if I really had to do this, then I think Jan has it right... use a uC.
George H.
For Jan... ;)
https://www.dropbox.com/s/6zokjuovzgq9xga/555%20%204%20freqs.asc
John Fields
How about...
LM555-RateVsVolts.png
on the S.E.D/Schematics page of my website?
Features constant time high, variable period.
I leave it to others to embellish the control curve, current mirror and TC to suit their application. ...Jim Thompson
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
V/F driving 200 ms one-shot.
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Here is a sketch of a fudged multivibrator doing the job.
formatting link
piglet
Cool circuit, thanks!
On a sunny day (Wed, 09 Jul 2014 15:48:07 -0500) it happened John Fields wrote in :
If you had a shop, and were selling components, that would be a good project to put in your 'newsletter'.
That would work better with the resistors in the drains, instead of the sources.
This might work:
formatting link
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Which is the same as...
LM555-RateVsVolts.png
on the S.E.D/Schematics page of my website...
where the 555 provides the hysteresis (accurately of course >:-}
Features constant time high, variable period. ...Jim Thompson
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
On a sunny day (Fri, 11 Jul 2014 10:22:31 -0700) it happened John Larkin wrote in :
40HC4046, LED to + from output via resistor. 2 resistor devider on inhibit, so LED on if inhibit high (Q out goes low). 1 sjip 4 ree-sisters 1 LET 1 capicitatordee-signed wile watsing moofie
Good catch; thanks. :-)
Now improved as....
LM555-RateVsVolts.pdf
on the S.E.D/Schematics page of my website. ...Jim Thompson
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
There's no LED!
And he wants solid ON at +5 in.
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
I presume the OP will know how to connect an LED to the 555 output ??
The "solid ON" is left as an exercise for the student >:-}
It _is_ a bit trivial to place "solid ON" at any desired _exact_ voltage. ...Jim Thompson
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Just add parts!
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Fewer for some people, more for others >:-} ...Jim Thompson
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required