This looks like a 1N4148 at first glance, orange in colour inside a
glass body.Nothing printed on it at all. No band indicating polarity. I
can't test it as it's open circuit. It is connected to the gate of a
BT136 triac. The unit is a professional flash 'head' used in
photographic studios. I am guessing here, but I think it could be
either some kind of low value fuse, or surge protector?

radio10 wrote:
This looks like a 1N4148 at first glance, orange in colour inside a
glass body.Nothing printed on it at all. No band indicating polarity. I
can't test it as it's open circuit. It is connected to the gate of a
BT136 triac. The unit is a professional flash 'head' used in
photographic studios. I am guessing here, but I think it could be
either some kind of low value fuse, or surge protector?


Sounds like it could be a diac.

Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com

Sounds like it could be a diac.

Ron(UK)


Many thanks for your fast reply Ron. Just found it in the Rapid
catalogue following your advice!

radio10 wrote:

This looks like a 1N4148 at first glance, orange in colour inside a
glass body.Nothing printed on it at all. No band indicating polarity. I
can't test it as it's open circuit. It is connected to the gate of a
BT136 triac. The unit is a professional flash 'head' used in
photographic studios. I am guessing here, but I think it could be
either some kind of low value fuse, or surge protector?

Diac quite likely. They're pretty much interchangeable - normally with a
breakdown voltage ~ 30V. It's a trigger device.

Oh - it may indeed be fine, it's open circuit until it triggers.

Graham

Diac quite likely. They're pretty much interchangeable - normally with a
breakdown voltage ~ 30V. It's a trigger device.

Oh - it may indeed be fine, it's open circuit until it triggers.

Graham


Many thanks for this Graham. Component identified!

Richard