Simple Preamplifier

This is a very simple, cheap preamplifier which can be used for condenser microphone.Or it a can also be used as a simple low power audio amplifier………this amplifier can be prepaired by 2n3904 transistor which is very very cheap and can be operated even with 3v dc………normally condenser mic(ELECTRET MIC) cannot be connected directly to a mixer or an high power amplifier , becoz it generates a different signal which must be converted to normal sound signal and if u connect it directly to a normal high power mixeror amplifier no sounds could be heared bcoz of this property.So u must convert the signal using a condenser preamp circuit…..but condenser mic(ELECTRET MIC) is a high quality mic which can even trace out small soundz and can also produce heavy impulses for that soundzzz………….

So these type mics r used widley……

THE FOLLOWING DIAGRAM SHOWS THE DESIGN OF CIRCUIT :

COMPONENTS

R1=10K

R2=100K

R3=10K

C1=0.1uF

C2=0.1uF

Q1=2n3904

###3 to 9 v dc must be supplied….if u use an adapter as power source there causes a humming due to rectified dc…..(it can be reduced by using a filter capacitor)BUT I prefer clear dc from a bettery….so that the output sound would be very clear ###

This circuit can be easily made using the above itemz..it can be even made on a bread board or on a simple PCB…..u can get all these components from a electronic shop……NOW THE OUTPUT OF THIS CIRCUIT CAN BE GIVEN TO A MIXER OR AN AUDIO AMPLIFIER…….AND U COULD HEAR THE SOUNDS ON MICROPHONE VERY CLEARLY……

This amplifier can also be used as a simple audio amplifier…… if the input of condenser mic is replaced with output of a audio cable……….

That issssszzzzz……………

This circuit now works as a simple audio amplifier…..!!!

TRANSISTOR 2N3904 CONFIGURATION (FOR BEGINERZZ)

This circuit will surely work if itz assembled as mentioned above……I have tested and proved the sameeee…..(if needed you can attach a 10k variable resistor as volume control on the audio output …)