Labels:text | black and white | diagram | font OCR: PHONE EARPIECE VA == 4131211098 INTERRUPTER Y DPor C.O. 60 1PM $038CC ( TOP) 120 1Pm RELAY MK 1 2 3 4 5 7 + 14V PAPRs DUAL-TONE OSCILLATOR TAP, Room 504, 152 W. 42 St ., N. Y. , N. Y. 10036 WITH INTERRUPTER 1.8K 15K W IK 02 390 8.2K 33K 533K 8.2k - LED 13 9 33k 20 20 33 K + 11 8039CC (TOP) 1 2 3 5 7 FREQ. ADJUST IK 1 Transistors- 2N2222, Hep 54, SK3020, or equivalent Voltage Controlled Oscillator- Intersil 8038CC Though this circuit is designed to Diodes- 1N914 or equivalent demonstrate busy tones and dial Relay- 12 Volt with coll greater than 500 ohms, SPDT tones, it can just as easily be Frequency Adjust- 20K ohm trimpots, one for each desired frequency tuned to produce Multi-frequency LED- Any LED that will work on 35 milliamps tones (Blue Box). Capacitors- 15 volts or greater Resistors ...
