Wednesday, November 2, 2016

Circuit Schematic Audio Visual Indicator for Telephones using BA8204 IC

Eltronicschool. - Now, there are many audio visual indicator design like for telephone system application and other. These design will make everything will easy when using telephone system with the indicator.

In here we will give you one circuit schematic of audio visual indicator system for telephone like in Figure 1 below. The main component in this circuit are BA8204 IC and other components.

Circuit Schematic

Component Part
  1. Condenser Microphone (CM)
  2. Resistors
  3. Switch
  4. Capacitors
  5. Transistors
  6. BA8204 IC

Circuit schematic like in Figure 1 above is Circuit Schematic Audio Visual Indicator for Telephones using BA8204 IC. According ElectronicsZone that published this circuit describe that this circuit does not require any external power source for its operation. The section comprising resistor R1 and diodes D5 and LED1 provides a visual indication of the ring. Remaining part of the circuit is the audio ringer based on IC1 (BA8204 or ML8204). This integrated circuit, specially designed for telecom application as bell sound generator, requires very few external parts. It is readily available in 8-pin mini DIP pack.

Resistor R3 is used for bell sensitivity adjustment. The bell frequency is controlled by resistor R5 and capacitor C4, and the repeat frequency is controlled by resistor R4 and capacitor C3. A little experimentation with the various values of the resistors and capacitors may be carried out to obtain desired pleasing tone. Working of the circuit is quite simple. The bell signal, approximately 75V AC, passes through capacitor C1 and resistor R2 and appears across the diode bridge comprising diodes D1 to D4. The rectified DC output is smoothed by capacitor C2. The dual-tone ring signal is output from pin 8 of IC1 and its volume is adjusted by volume control VR1. Thereafter, it is impressed on the piezo-ceramic sound generator.

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