Re: Function of component in flash tube trigger circuit?

"Rheilly Phoull" <rheilly@xxxxxxxxxxxxxx> writes:

"N_Cook" <diverse@xxxxxxxxx> wrote in message
news:fv49ki$qlj$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
http://home.graffiti.net/diverse:graffiti.net/sf2.jpg
No markings, a black potted box 7x7x 15mm external dimensions.
If a stepup transformer , why so small?

0.3 ohms between blue and red lead and 144 ohms between blue and brown
lead which goes directly to the trigger filament around the flash tube.
Red goes to ground and blue wire goes via 0.2uF, 250V capacitor to the SCR
cathode. 22mH and 20uH inductance
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

If you dont like small put it in a larger box, manufacturers are not known
for extragance and they tend to use the minium specs components.
Perhaps you may like to reword the question ?

It is definitely the trigger transformer. Typically a few primary turns,
a few hundred secondary turns, takes 150 V from a capacitor discharged
through the shutter contacts or an SCR, and produces 10kv or more to
the trigger wire or reflector of the flashlamp. But essentially no current.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
.

Relevant Pages

  • Re: Function of component in flash tube trigger circuit?
    ... ohms between blue and red lead and 144 ohms between blue and brown ... It is definitely the trigger transformer. ... I may try subbing this tiny stepup transformer ... with one 3 times the size from a compact camera, as am wondering if it could ...
    (sci.electronics.repair)
  • Re: Function of component in flash tube trigger circuit?
    ... a black potted box 7x7x 15mm external dimensions. ... If a stepup transformer, why so small? ... ohms between blue and red lead and 144 ohms between blue and brown ...
    (sci.electronics.repair)
  • Function of component in flash tube trigger circuit?
    ... a black potted box 7x7x 15mm external dimensions. ... If a stepup transformer, why so small? ... ohms between blue and red lead and 144 ohms between blue and brown lead ...
    (sci.electronics.repair)
  • Re: Cartridge loading - does it matter?
    ... either the 40 ohm input of Denon's AU-320 stepup transformer (which I ... also have) or 100 ohms if used directly into a preamp. ... I have found that several of the commerical stepup TX's are built with fixed loading resistors, so altering the load presented buy the phono stage may have little effect. ...
    (uk.rec.audio)