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[OM] Re: OM3 flash with no batteries????

Subject: [OM] Re: OM3 flash with no batteries????
From: "Piers Hemy" <piers@xxxxxxxx>
Date: Thu, 6 Jan 2005 21:22:27 -0000
http://olympus.dementia.org/Hardware/PDFs/T-20_tech.pdf provides the PCB
layout and parts list.

The T20 has three thyristors and one photo transistor.  The last named is
what is inside the "O" of Olympus, and provides the light measurement
facility when the T20 is in automatic mode (ie not Manual, not TTL OTF) 

--
Piers
 
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Simon Worby
Sent: 06 January 2005 20:46
To: olympus@xxxxxxxxxx
Subject: [OM] Re: OM3 flash with no batteries????


Jeff Keller wrote:

>>>>> Silicon Controlled Rectifier, nowadays 'colloquially' termed 
>>>>> Thyristor
>>>> Like the bit in the "O"lympus on the T20/32?
>>> No, that sensor is not a thyristor.
>> What is it, then?
> An electronic switch formed from alternating P and N layers of 
> silicon. (very roughly similar to a transistor)

But that *is* a thyristor, is it not?

Simon
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