Labels:text | diagram | black and white | sketch OCR: ---------- YIPL CIRCULATION: 400 ..... .. ...... PARTY LINE DO NOT READ THIS! OCTOBER, BELL 1971 SYSTEM ops! We must correct an error in issue o. 2. The Start and Stop tones were VOLUME 5 incorrectly identified. The following re the correct tones, guaranteed to YOUTH INTERNATIONA, ork perfectly. Please, if you save ack issues, or pass them out, change he info on them right now. REMEMBER THE BLUE BOX ? 700 900 We have received, in response to the blue box story, 700 1100 requests from many people for schematics. We have 900 1100 no such schematics, and would not publish them if we 700 1300 did, for that would be unlawful activity. 900 1300 The following is a reader-supplied schematic for 1100 1300 well-known phase shift oscillator. This transistor 700 1500 oscillator can be operated from a ...
