sound

If we want good quality sound system,the first thing to consider is that a good pre-amp.
Some people say that’s not necessary. But when the low-level audio source.
We may need to adjust the sound too high will cause distortion.
so should have the preamplifier to amplify a signal up before to the our power amplifier.

And I use transistors to build as small pre-amps because.

1. I am familiar with it than other devices. Even though the quality is good.
2. There are many to choose from build circuits.
3. Lower noise. Compared with ICs.
4. Cheap, easy to find accessories.
Seeing these advantages. Let’s consider circuits different example, I would suggest the following.

Read more and see circuits at source :http://www.eleccircuit.com/simple-preamplifier-circuits-by-transistors/

These circuits is used to control audio with light. In simple transduction And the change of light. To control the tone.,we is recommended that three circuits, each circuits consists of a simple device. Suitable for studying the performance of optical sensors is LDR.
Tone Generator Control with light using IC 555

This the Tone Generator circuit that interesting because of can control the sound has with the light. By use the integrated circuit NE555 be pillar equipment , which perform produce sound frequency in model Astable Multi vibrator or pulse generator. And use 25 ohm small-sized loudspeakers. For the equipment detects the light. I uses LDR because of be usable good easy and economize with. For tone sound use can fine C1 get. by many values , make the low voice but when the value is a little make tall sound goes up. The detail is other see in the circuit better.
Read more source: CLICK HERE

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.
Read more and view circuits

This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on hold. The circuit operates as follows: The RED wire from the phone jack is typically positive and the GREEN wire is negative or ground. When you want to place a call on hold, close S1 and hang up the handset….

Read more and view circuits at: Phone “Hold” With Music

More circuits
More circuits about telephone hold music
More about telephone hold circuits
Telephone Audio Interface
Telephone Voice effect Changer

Low Noise Circuit Low Noise Variable Output 1.25V to 12Vdc. Wednesday, January 27th, 2010. This circuit is DC
converter low voltage , 12V from be 1.25V to 10Vdc by can give …

Low noise tone control circuit using C945 If you have electronics old equipment, keep many long ago year, unknow build Electronic Project good. I begs for to advise pre tone control circuit this. By it can fine to decorate the sound Bass,Treble and Volume well.There is the prominent point that use transistor, But be of good quality of good sound doesn’t be defeated the circuit that uses the integrated circuit. By the thing that me observes clear, be the noise is low, bland sound are good….

Classic Tone control circuit with low noise transistor Today I meets Classic Tone control circuit. That is use low noise transistor model. which this circuit the interesting , because transistor entirely then have a voice good and economize good. From circuit this use transistor 3 pcs. For pretend pre tone model mono , if you want to use are the system stereo. As a result build this circuit enhances again the group only , The prominent point of this circuit again type….

1.5V to 5V Low Noise Step-Up Converter by LT1073 Here is Circuit DC to DC Converter Low Noise. OR Circuit 1.5V to 5V Low Noise Step-Up Converter. Using IC LT1073….

Low Noise Variable Output 1.25V to 12Vdc This circuit is DC converter low voltage , 12V from be 1.25V to 10Vdc by can give current topmost get about 1.5A. You should use IC number LM317K because have electric many power more the number LM317T. By should hold heat sink. That have large-sized with. The R4 use for fine decorate voltage output….

Pre Tone Control high quality with transistor low noise Designing power amplifier Circuit is high quality. The some is the thing that must think over most. Be Pre tone control circuit , but friends must not worry. I has this circuit that it transistor all work in feeding character gets back to model specialty. Be use Constant Current source be something bias that get from LED help have the stability in manner temperature work of Q1 and Q2 improve…..

LT3439l low noise switching architecture Figure 1 shows the LT3439, one of several low noise switchers available from Linear Technology. Ultralow noise and low EMI are achieved by controlling both the output switch voltage and current slew rates. This switching architecture is particularly well suited to noise-sensitive….