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1
Projects Q/A / Soldering station project
« Last post by HackoBoy on October 24, 2014, 11:47:44 PM »
hello
First, I apologize that my English is not very good and at times I use google translator :)
But most of them understand words

I decided to buy a soldering station, but those who themselves control the temperature sensor and heater use - were quite expensive in my city.
After reading information on the internet - I saw that they are working on 24 volts.
I had an old transformer - which I rewound the throttle from a street lamp - and has output parameters:
no load at the output 25.4V  After turning on the car lamp series connect  40 watts + 45 watts = voltage is 23.4 volts - the current in the lamp is 3.8A.
Once convinced that the transformer does not hum and gives a current that I need - I decided to use it. Maybe the voltage is slightly below the required 24 volts, but it will do the job
I liked the  controller Hakko 936 - that no digital thermometer for temperature visualization.
After I saw pdf   - I thought it might add thermometer.

Give advice if possible.
schemes applied to the controller which costs $ 13

http://www.mmccs.com/mmarc/n0ss/hakko_936_schem-pcb_%26_mod_v1r7.pdf

After the thermocouple - signal is amplified by IC2D and IC2A and feed triac driver -> IC1 turning the triac.    Something like a comparator - am I right or not ?
If I take the amplified signal from the thermocouple by foot "pin4  IC1"  if there will be a disruption in the operation of the scheme.

I found two schemes thermometer - but if you can give me a better option.
1:  http://vrtp.ru/index.php?act=categories&CODE=article&article=2137
2: http://www.299792458.ru/news/2010-02-28-14

translate from RUS to ENG
1: https://translate.google.bg/translate?hl=bg&sl=ru&tl=en&u=http%3A%2F%2Fvrtp.ru%2Findex.php%3Fact%3Dcategories%26CODE%3Darticle%26article%3D2137
2:https://translate.google.bg/translate?sl=auto&tl=en&js=y&prev=_t&hl=bg&ie=UTF-8&u=http%3A%2F%2Fwww.299792458.ru%2Fnews%2F2010-02-28-14&edit-text=

But if you can offer me icl7107 scheme to 500 degrees Celsius - I would be grateful
2
Electronics chit chat / Re: An interesting question about capacitor
« Last post by Hero999 on October 24, 2014, 03:02:46 PM »
I don't understand the question. If both the plates of a capacitor are at the same potential, then there will be no charge on the capacitor.
3
Electronics chit chat / Re: Low power solenoid?
« Last post by Hero999 on October 24, 2014, 01:28:19 PM »
An electric motor with gears will do the job.

Another possibility is a piezoelectric linear actuator.
4
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by mehrdad125 on October 24, 2014, 09:24:01 AM »
I'm interrested about 0-30 VDC STABILIZED POWER SUPPLY WITH CURRENT CONTROL 0.002-3 A and have couple of questions.

-Is it possible  to inpute dc voltage apply?
any help is highly appreciated.
5
Electronics chit chat / Re: Low power solenoid?
« Last post by liquibyte on October 24, 2014, 09:08:32 AM »
A solenoid is just a linear motor therefore with no power you have no holding torque.  You can get a mechanical assist with some via a spring but unless you want to hold open when the power is off and release when power is on I don't think this will do you much good.  I think what you'll be after is some sort of mechanical solution beyond just the solenoid itself.
6
Electronics chit chat / An interesting question about capacitor
« Last post by Chengjun Li on October 24, 2014, 08:49:23 AM »
Hi, I have an interesting question about the charge accumulated on a capacitor.

We know that if the charge accumulated on a capacitor is Q=C*V.
V is the potential difference across the capacitor.

Then my question is if the two plates of a capacitor have the same potential, for example we can use two power supply connect to the two plate separately,  setting the same voltage value, then will there be charge accumulate on the capacitor plates?



7
Power Electronics / half bridge Smps wave forms .....
« Last post by aniket87 on October 24, 2014, 08:22:28 AM »
hi ,
i have built a half bridge smps with pfc front end for 2 X 200W class - D . it works fine but the wave forms that i see is troubling me .... Can any one have a look and tell me if i am doing it wrong ..... the smps has a open voltage loop . wat is troubling me is primary waveform at 90% load the wave form should be flat during the dead time which it is not ....


regards
aniket
8
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by liquibyte on October 23, 2014, 10:12:55 AM »
Hi..
please...for guidens..If you remove the ac source. than...
What is the direction of the applied dc voltage solution.
thanks..
I guess nobody replied is because we cannot understand your broken English.

1) "Remove AC source". Turn it off?
2) "Direction". North, south, east or west?
3) "Applied DC solution". DC applied to what? Solution of what problem?
I don't think this was a legitimate question, more of a "let's get our post count up so we can spam with links" kind of thing.  I deleted a post that had
Quote
Hi ...
What software can simulate the circuit.
Thank you.
in it and probably should have deleted this one as well.  They don't like it because we've implemented more aggressive spam measures but at least it's wasting their time.
9
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by audioguru on October 23, 2014, 08:33:14 AM »
Hi..
please...for guidens..If you remove the ac source. than...
What is the direction of the applied dc voltage solution.
thanks..
I guess nobody replied is because we cannot understand your broken English.

1) "Remove AC source". Turn it off?
2) "Direction". North, south, east or west?
3) "Applied DC solution". DC applied to what? Solution of what problem?
10
Electronics chit chat / Low power solenoid?
« Last post by jessicabrenner on October 22, 2014, 11:24:56 PM »
I want to apply force for an extended amount of time (10 secs to a couple minutes) using a solenoid actuator. Unfortunately, it seems that solenoids use a lot of power when they are active. Is there a solenoid type that will only use power when switching between active and not active? There's probably a way I can do this with an external mechanism, but I was wondering if there may be commercial solenoids that have this built-in.

Thanks,
Jessica
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