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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)] | ||
* [http://w140.com/tektronix_21a-22a.pdf 21A and 22A section of 555 manual (PDF)] | |||
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