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Simple Slave Flash


Current designs of slave flash units are, in the opinion of the writer, too complicated and may be simplified without any problems and without losing any of their usefulness as may be seen from the accompanying circuit diagram. This proposed circuit offers a number of advantages:
- no need for an additional power source, since power is derived via the sync contacts of the main flash unit;
- automatic reset (no need for a button);
- operates with new as well as older main flash units (contact voltage >100 V).
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