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EL wire hassle

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LAN_403

Conundrum

Sun Nov 04 2012, 12:29AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059

Hi all.

Any ideas why the "flicker" EL wire won't switch reliably using an MPSA42 yet the original sort will?

So far I can only get it to work with photoresistors and LEDs which is less than ideal.

Any ideas?
Something about this wire seems to be different, I even tried tying all the cores (6) together and it still stays lit whether the transistor is off or on.
Tried bypassing transistor with a diode and .. same problem.

EDIT:- Asked someone. the upshot is that it might be the base-emitter resistor is too big.
Should be around 2K2 or less, I was using 10K because thats what was available.
Seems that it might be device capacitance causing the transistor to stay on, with this much voltage it acts like a 200K resistor so the wire will light up.

On the flip side, has anyone tried building a Joule Thief using an MPSA42 ? Ought to generate at least 150V and should be reliable.

thanks!
-A

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