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Brundizzle B (verified by your mother)
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Any suggestions for me?  I would like to make a bench power supply.
I have this transformer that transform 220V AC to about 10V AC.  with  rectifier bridge I make DC from it...    I use a 2200 uF capacitor to get a steady voltage.   the LED and resistor are just there to indicate it's on and to discharge the capacitor when it's off.   I then feed it into a voltage regulator (LM317T) to be able to fine tune the voltage.

I am actually thinking of connecting a couple voltage regulators in parallel (connection to point A en B) to provide me with 1V, 3V, 6V and 9V.    I also think I should build a current limiter in there. (maybe the easiest way would be a simple fuse) 

What I am still struggling with is the value of the smoothing capacitor.  2200uF seems to work...  but I am not sure if this is the best choice. I found a general formula for the value of a smoothing capacitor:  C = I * t / dV   (where t  time and dV is the voltage drop to be compensated by the capacitor.     In my case it is easy...  mains come at 50Hz and the 10V AC as well, so the gap between the peaks is 0.01 second.  Voltage drop seems to be around 12 V when I measure it...   However, I have no clue what the current is.  I tried to measure it using a crappy multimeter (used the 10A socket) and the meter read 19.5  ...  I suppose the thing would fuse over 10A ...  and it didnt.. so maybe it's 2A?   Also not sure if i measured it correctly..basically shortened it with the meter.

anyway...  any suggestions are welcome! :) 
 
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Brundizzle B (verified by your mother)'s profile photoTesla Explorer's profile photoMichael Kukat's profile photo
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Hm. High power regulation with a transformer delivering just 0.5A? :)

The circuit is even wrong, it doesn't sense the output. No thermal compensation at all.

And due to missing balancing resistors at the transistors, the one with the highest current amplification will die first.
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Dammit... After 237 images it stopped taking pictures.. Have to figure out why.. Maybe it ran out of spave.. 
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Eid Mubarak to y'all! 
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while i was behaving like a lunatic.. some cuntface broke into our locker and took our stuff out... luckily he must have been stupid (and/or in a hurry) because when we found our stuff in the dressing room, my phone, wallet, and carkeys were stil in the pockets of my shorts! 
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That sucks, man! Luckily you still had some things left. 
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Playing with Tasker... this time it worked.. but it also failed to properly run a camera loop several times before... 
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i am not too impressed with this Tasker app ...  
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Binj Komisar's profile photoBrundizzle B (verified by your mother)'s profile photo
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no problem :)  .. . let me know how you would calculate the joules from the datafile (see my other comment on your original post) .. and it probably won't be too hard for me to put it in teh speadsheet and pull a graph from it  
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Have her in circles
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Now that I have your attention.... could anyone explain to a non American what the big deal us about the confederation flag? I know about the civil war and all, but what is it that symbolises this flag nowadays for ppl who want to keep it?

#confederationflag #flag
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Diadon Acs (Conscious Energies)'s profile photoBrundizzle B (verified by your mother)'s profile photoRanajo Dezanett's profile photo
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That has been my experience.
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7.5 hrs in my 24hrs time lapse recording... about 220 pictures taken. 720 to go in total... 
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timelapse 7hrs from night to morning... next attempt is going to be a 24hr timelapse
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another attempt.. not using "tasker" this time
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there once was a time i had time to create nonsense like this...
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+Binj Komisar  Just playing around...   I know U3 (or U4) wasn't connected..and hence the discrepancy... but for the sake of preparation I played around with the data a bit...  My main concern is filtering out ripple in the circuit influencing the readings. (and eventually the the joules in vs joules out)

The blue line is the (raw) Therm1 reading. The straight line through it is a linear approach. (assuming the temp will vary smoothly and not abruptly as the measurements suggest .  (assuming a linear increase of temp for now) 

the green line is the Therm2 reading (hope u r not colour blind :)..  assuming any ripple in the circuit will  impact both therm1 and therm2 in a similar manner (data suggests it does), I used the linear approach of therm1 to correct the readings of therm2 (orange line is the result)  

I can't really prove it, but i feel confident this approach works for two thermistors with identical characteristics  close to each other (same temp)  ...   however..  for the thermistor in the tube, the temp might be quite different and the changed resistance of the thermistor  might  impact that part of the circuit in such a way that the ripple is different for Therm3

not quite sure if this makes sense...   

p.s. actually hoping you pull off this cold fusion and it gets so freaking hot in the jar that there is no doubt it worked :)
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+Brundizzle B I am working on a boost converter right now for the apparatus, I want to make it more compact and [portable, I will keep you informed as things progress... Thanks again :)
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