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This is a Simple Signal Injector Circuit Diagram. The unit provides a square-wave output that is rich in harmonic content. The circuit`s output frequency can be varied from 50 Hz to 15 kHz. The heart of the circuit is a 555 a stable connected in its equal mark/space mode. The frequency is controlled by potentiometer R2 and capacitor Cl. Resistor R3 controls the output level with the output ac-coupled through C3. Simple Signal Injector Circuit Diagram

Time signal system is use where personnel working in hospitals, offices, schools and industries and the likes are notified, by means of alarming a bell or buzzer, about the time for lunch, coffee break, break time, time in and out. Control Circuit The control circuit is composed of an automatic time switch (ATS), similar to the one discuss in Article 18.0 and a time delay relay (TR), see figure (A). To alarm the bell B at 12:00 noon for lunch break, pin 0 is inserted in of slot disk of the ATS at 12. Adjacent to the orange pin o is the white pin W place at 12:15*. At 12:00 noon, the orange pin 0 will pass the ATS switch. The normally open contact of the ATS (13-14) will close at this time to ring the bell B. Simultaneously with ringing of the bell B, the timer TR (2-7) is energize. The duration of ringing the bell B will depend upon the adjacent in the timer TR. That is , if the TR is adjacent 10 seconds, the bell will ring for 10 seconds. After 10 seconds the timer contact TR (8-6) w...