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Camera Circuit Problem Answered

Most of these have a inverter with 5 pins. Side A: 2 pins. Side b: 3 pins.

Well, mine came with 4 pins total.

http://members.misty.com/don/kflashm.gif

As you can see theres 2 transistors.. MY question / idea.. Why cant u just delete the transistors? Like...

Left side of inverter
Top = Battery +
Bottom = Battery -

Right side of inverter:
Top = Line to capacitor
Bottom = Odly Battery +

Is there ANY way i can hook this up Easier? I WANTED to cut the circuit to that super small size, with a LED, Transistor, Diode, and inverter. But .. Thats impossible with these.. and i got 8 of the 4-pin ones!! ARG!

Discussions

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LittleHairyApe

10 years ago

Agree with everything so far. Here's an extra idea to add to the mix. The two transistors are wired into a darlington configuration. AFAIK you can still buy darlington pairs in a single package that takes up the real estate of a single xistor. You can't get rid of all amplifying devices and still convert DC to AC. You need gain to sustain oscillation. Hope that helps.

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westfwLittleHairyApe

Reply 10 years ago

It's not quite a darlington config. The collectors aren't common.

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LittleHairyApewestfw

Reply 10 years ago

Point taken, but in this case I don't think they need to be. Substituting a device such as a Digkey 2SD16450R-ND would perform as well or better that the current design, and it would have one less part. At $0.89, the cost is pretty cheap. Can you PM/email about those model rocket strobes? It sounds interesting, but I can't get a mental picture of how you were applying them. Don't want to thread-jack Killa-X's thread.

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westfw

10 years ago

A transformer will only step up AC voltages, and you need at least one transistor to convert the DC from the battery to AC. I've made some model rocket strobes from this sort of flash, but it doesn't look like I ever minimized it past two transistors (the original flash circuit has three.) I'm not sure that it couldn't work with one, but I didn't do it. The final circuit is still pretty small:

max-strobe.png
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NachoMahmawestfw

Reply 10 years ago

> A transformer will only step up AC voltages ... . They go both ways. Swap the input and output and it will step down the voltage.

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Killa-X

10 years ago

Well, i was going to hook like 7 together. so i figured an idea. Desolder ALL the inverters out. Then keep 1 full circuit, and link the correct wire locations to each of the 7 inverters. :) I even got some REALLY old circuits, no micro anything. and a 6-pin inveter, wow..

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killerjackalope

10 years ago

If it's for something that doesn't need to be small then stuff it and go large, if you need it to be tiny for a proper reason then you may have to desolder everything after making an exact note and schematic of the circuit and soldering everything on with no board, using heat shrink as insulation. Another option would be to fold the circuit up, insulate the bottom, cut in half and solder jumpers between the broken traces.