Simple pre mic dynamic and Electrec condenser micro phone
Amplifiers
This be simple pre mic circuit, that can can enlarge both of dynamic micro phone and , Electrec condenser micro phone. Then convenient for usable with small-sized stereo or the indoor. By entering into power supply circuit LED1 will light showing the work of circuit conditions. The operation of this circuit has mic input 2 parts Electrec condenser micro phone and dynamic micro phone that it was Mike’s party that does not require power. When it come it passed to the C3 functions coupling capacitor signal filtering out only the signal to enter the B pin of Q1 amplifier to …
Pre mic audio amplifier with ic LM386
Amplifiers
This circuit be signal sound expansion from condenser microphone give with small-sized loudspeaker. It compose the importance is part pre mic use transistor just one enlarge sound signal gives the power goes up change come to a part amplifier with the integrated circuit LM386 utter go out give a loudspeaker. When feed 9V power supply reach the circuit. The MIC1 and Q1 which be part pre mic, by mic will take sound signal has come in then deliver Q1 enlarge a signal has power size goes up to go out the way collector pin (C) change C2 coupling signal. Then …
Light turning bike using IC LM3909
Basic Circuits
Usual already a bicycle has will no Light turning. If want to turn a car may be born dangerous can go up. Because of a car that drive to follow come to don’t know that turn thus. We should enhance the safety gives with one self with building light turning bike circuit this upward. The work of the circuit be in usual time switch S1 will stay in a position OFF. If the circuit will turn to the right move switch S1 go to a position Right have power supply 1.5V, go to at IC1 which be IC1 work oscillator …
Simple speaker overload protection circuit
Alarm systems
This is simple speaker overload protection circuit. Generally the level of a signal that departs output of sound signal generator the all. The that get fix have standard same score be 1Vrms. But in now audio signal generator the all the that may produce come to exceed limitation standard of the level input of stereo power amplifier. Thus, This is simple speaker overload protection circuit., for protect a part amplifier and a loudspeaker are damaged. From circuit that picture when have input voltage resistor R1 perform current limit preceding still diode D1-D4 , build model Full wave rectifier circuit, for …