SOUND GENERATOR WITH IC 555 CIRCUIT SCHEMATIC DIAGRAM

SOUND GENERATOR WITH IC 555 CIRCUIT SCHEMATIC DIAGRAM
A flip-flop circuit is included, so this circuit will give sound output and blinking LED.

SOUND EFFECTS GENERATOR CIRCUIT SCHEMATIC DIAGRAM

SOUND EFFECTS GENERATOR (8 DIFFERENT SOUND EFFECTS) CIRCUIT SCHEMATIC DIAGRAM
Power is a 3 Volt battery, but the IC will work with any voltage between 2.5 and 5 Volts. Switch S1 is the on / off switch. The output at pin 10 is amplified and drives a small 8 ohm loudspeaker. Pressing S3 once will generate all the sounds, one after another. S2 can be used to produce a single sound effect, next depression gives the next sound effect. Standby current is about 1 uA at 3 Volt, so battery life is very economical.

ELECTRONIC BIRD'S CHIRP GENERATOR SCHEMATIC DIAGRAM

ELECTRONIC BIRD'S CHIRP GENERATOR SCHEMATIC DIAGRAM

The inclusion of R1 and C1 give this oscillator its characteristic “chirp”. As the 100u capacitor charges via the 4.7K resistor, R1 the bias for the transistor is cut off. This causes the oscillation to stop, the capacitor discharges through the base emitter circuit of the transistor and oscillations start again. Altering these components alters the frequency of the chirp. The chirp is also voltage dependent. When the push button switch is operated the 100u capacitor is charged. When its released, the oscillation decays and the chirp becomes faster.

ELECTRONIC BIRD'S CHIRP GENERATOR SCHEMATIC DIAGRAM

ELECTRONIC BIRD'S CHIRP GENERATOR SCHEMATIC DIAGRAM

The inclusion of R1 and C1 give this oscillator its characteristic “chirp”. As the 100u capacitor charges via the 4.7K resistor, R1 the bias for the transistor is cut off. This causes the oscillation to stop, the capacitor discharges through the base emitter circuit of the transistor and oscillations start again. Altering these components alters the frequency of the chirp. The chirp is also voltage dependent. When the push button switch is operated the 100u capacitor is charged. When its released, the oscillation decays and the chirp becomes faster.