What to do with a tube from a CFL that has broken electronics?

Hi
I have a couple of broken CFL's, The tube still works and I want to do something with it.
Any ideas on how to make it light up from 12 volt, Without a ionization antenna (Using the heating filaments instead).

Any other ideas??

Anyone else want to know what to do with them too?

I don't want any comments that say THROW IT OUT or similar


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110100101108 years ago
the push pull setup is allmost the standard setup copied and mirrored

there is small difference with the way the transistor bases are connected to prevent it from freezing in the who starts first question (the transistors are identical)

usually a one transistor can perform well and is more tolerant to badly matched components etc. i suggest to start with 1 and see if you need 2 at all
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thermoelectric (author)  110100101108 years ago
That seems like a pretty good setup, I'll try that as soon as I get my parts back, What size resistor should I use? How many turns in that extra coil?
resistor is few k ohm or less and depends on the transistors you use the extra turns depend on lots of stuff too search online for exact circuit or just experiment
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thermoelectric (author)  110100101108 years ago
Oh, Yeah.
110100101108 years ago
continued

yep but if you look after the diodes there are 3 wires going to the circuit. they are like 2 dc supplies one at full voltage and one at half (the center wire)

the capacitors are not necessarily polarized. they draw them all with curved line. see the one at the right which is on ac and cannot be polarized
and with second thought . . . this circuit needs external high voltage source or heavy modifications to work on 12 V there is no transformer in it. in no way it can make more than 24 V out of 12 V. the chip works with 12 V but its not enough for the lamp
thermoelectric (author)  110100101108 years ago
There's a couple of inductors in there that I presume are used for obtaining a high voltage.

It says that the Vb pin can reach 625 volts, Enough to keep the tube lit. I don't know how it reaches it though
thermoelectric (author)  thermoelectric8 years ago
Have a look at page 23 of the datasheet, It tells you the parts and it says that the line voltage was 110VAC??!!?!?!?!?!
yep

it runs the lamp and the preheat from line voltage (both thru appropriate resistance)

with 12 V it is ossible to drive the chip and preheat but not make discharge. adding step up transformer may be possible but is complex. its simpler to make something without this chip than to hack the circuit to work on 12 V

on 12 V preheat and discharge work better when preheat is directly from DC and discharge is from inverter. in standard high voltage systems they both are done from the same supply

here are some shots of magnetic perfektstart ballasts for 240 V. they are made of transformer and thermal relay. in 12 V the transformer is replaced with inverter and thermal relay with standard relays and timing circuit

(lol in the old one (larger one) they actually wrote perfektstart with K)
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