Posts Tagged ‘Audio Signal Generator’

Musical chime generator with ua741 oscillator

This is a musical generator that uses bandpass filter circuit with ua741 op-amp as act converts a sound signal in multiple feedback patterns. When connected the voltage input from a rhythm generator with a short pulse , makes it ring in natural resonance frequency. As the output oscillations vanish suddenly and resemble percussion or strum sounds naturally.

The higher the Q the longer the decay time constant. The VR1 is used to adjusts a Q value. The fo is 1/(185 x 1000 x C). The high frequency resonances resemble chimes, lower frequencies sound like calves or bongos. Several circuits, all with different tuning, driven by pluses from a rhythm generator can produce an interesting pattern of sounds.

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Simple signal generator circuit by 2N3906

This circuit is a simple signal.It can generate signals, both light and sound Alternating.Which can be applied to work. For example Taillight of bicycle or Turn left and the right of the bicycle. Etc.
When entering into power supply circuit. by circuit will have Q1 and Q2 to be astable multi vibrator. This will work in any way ON and OFF.Or vice versa on all the time.And Pin Collection (C) of the two transistors.Connected to the light source device (LED1-LED4).For the audio source device is Buzzer BZ1.While the one ON transistor will allow the device is connected to pin C is running.The signal alternates between light and sound all the time.

Telephone Ringer

The Phone Ringer circuit will work with any ordinary phone including older bell ringer types. The circuit rings the phone in a completely realistic manner until someone answers. When the receiver is lifted the user hears the audio of your choice. It might be another telephone, a tape recording, a favorite talk radio show, a fake busy-signal, a scanner tuned to weather or police, cues for the actor who forgot his next line, or whatever audio source strikes your fancy. [...]

Read more source:

http://www.techlib.com/electronics/telephone.html

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