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Camera circuits in parrallel?

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Plasmaarc452

Wed Apr 16 2008, 07:00PM

Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
Location:
Posts: 111

I was wondering, since i came up with the mod for the camera circuit size reduction I can now fit 10 circuits onto a small pcb but will it charge faster or will there be no performance increase?

Basically does the charger rate increase linearly for the more circuits that i put in parallel, Say a capacitor takes 6 seconds to charger on 1 circuit, will 2 circuits in parallel charge it in 3 seconds?

Myke

Wed Apr 16 2008, 09:43PM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

I think that you will have to make it so that the waveforms are synchronized otherwise bad stuff might happen (it burns up?)
maybe

Plasmaarc452

Wed Apr 16 2008, 10:47PM

Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
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Posts: 111

I really don't want to make it that complicated, would it be as simple as placing a filter capacitor at the end? In that case its easy but I am unsure.

I know for a fact that I can hook up the input power in parallel and that I can get a power source thats big enough (3-4 D cells in parallel). Waveform shouldn't be a problem if all of the circuits turn on at the same exact time, but I do not expect the waveform to be perfect at all. To protect the circuits themselves I can use diodes on both output wires. That should prevent the circuit from having any problems. All of the circuits will be hooked up to 2 thick channels on a pre drilled board (Positive and Negative).

I am only going to be charging photo capacitors and if it works out well I may use it on larger capacitors.

Tesladownunder

Thu Apr 17 2008, 12:47AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

It should work OK without diodes. What I did that may be simpler, was to run it on 3V 1.5A and substitute the main transistor for a BD140 and small heatsink. Works enough to power this.

TDU

Plasmaarc452

Thu Apr 17 2008, 01:14AM

Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
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Posts: 111

Ok as in performance reduction?

Well that is cool, I have been meaning to trying to replace the transistor but I do not have a transistor with the correct specs.

How fast did it charge at 1.5A?

flannelhead

Thu Apr 17 2008, 06:17AM

Registered Member #952 Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388

I used the original transistors. I put two transformers in parallel, and ran them with 3 volts. Works quite fine.

You might want to add another 1.5V battery in parallel for each transformer you add. This is essential to increase the performance as you can draw more current from the batteries.

Conundrum

Thu Apr 17 2008, 10:42AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

Um, arcing to your hand is a little risky.. even with limited current.

Also, I've made a device that uses 8 cold cathode (CCFL) inverters in parallel, the trick is using diodes to combine the outputs and ground the "0V" sides using current limiting resistors. If you just connect the grounds together bad things happen due to high loop currents (Fizzle POP Byebye transistors!)

I once tried this with camera flash transformers, and a PIC to sequentially drive them. I did get a bit more output but less than you might expect (no overlap, duh!) and it rapidly drained my test battery.

-A

Plasmaarc452

Thu Apr 17 2008, 08:10PM

Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
Location:
Posts: 111

I can run them at 3v but are you suggesting that I give each circuit its own individual battery?

Can't I just make 2 wide channels (+ and -) and connect 4 d cells in parallel and series to get 3v. That would allow many amps to flow through the 2 channels from which the circuits can draw all the current they want.

Backyard Skunkworks

Fri Apr 18 2008, 01:31AM

Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451

I have tried running these little boost converters in parallel, the second one won't start. The first one will always start and it doens't seem to damage them but you just cant run more then one off the same battery.

EDIT: Should have made it clear that these DO run in parallel, just not off the same battery.

teslaguy

Fri Apr 18 2008, 07:25AM

Registered Member #617 Joined: Fri Mar 30 2007, 07:29PM
Location: Buffalo NY
Posts: 49

I have successfully run 4 in parallel charging a FREAKING HUGE capacitor bank, but that might be because i had them charging the banks at separate points though and the resistance between the points might have had something to do with it. I can hook up my o-scope and look at the waveform at the different points if you want but i think everything should be pretty stable.

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