[pure-silver] Re: Enlarger Voltage Control Question
- From: Dana Myers <dana.myers@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 15 Jul 2018 21:14:54 -0700
On 7/15/2018 7:55 PM, Dave Hornford wrote:
Assuming the diagram in the google search is yours and I read it correctly,
yes. The black lead hours through the system
Dave
https://www.google.ca/search?q=Chromegatrol+witing+diagram&ie=UTF-8&oe=UTF-8&hl=en-ca&client=safari#imgrc=uNHgMSfLM7xNlM:
Perhaps I do not understand the question correctly; K1 connects the safelight
socket BLK lead directly to the AC power mains BLK lead via fuse F1. This
bypasses T1, which, I assume, is a constant voltage transformer.
When powering the enlarger lamp, T1's primary winding 1-2 is
connected to the AC mains BLK, and the output taken from the
secondary winding(s) 3-4, which is isolated from the AC mains.
So I don't think the safelight socket is voltage stabilized at all.
Cheers,
Dana K6JQ
P.S. Fascinating to see an LM322 timer chip in that circuit; superior
to the 555 timer, it's no longer made.
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