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* [http://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources] | * [http://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources] | ||
* [http://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)] | * [http://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)] | ||
* [ | * [[Media:Tektronix 21a-22a.pdf|21A and 22A section of 555 manual (PDF)]] | ||
* [http://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF)] | * [http://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF)] | ||
}} | }} |