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Category: Audio Circuits / Microphone Circuits Views: 5472 Rank: 0 This relatively simple mixer was designed for three dynamic microphones, but can be re-designed for more or less. Level and tone controls are available to tailor the sound to your needs.R1-R3 are level controls. R9 and R11 control bass and treble, respectively. Since the circuit draws such low current, two 9V batteries can be used for a power supply. Building the mixer in a metal case will cut down on noise. visit page. R1-R3 are level controls. R9 and R11 control bass and treble, respectively. Since the circuit draws such low current, two 9V batteries can be used for a power supply. Building the mixer in a metal case will cut down on noise. http://www.aaroncake.net/circuits/mixer2.asp
Related circuits This circuits allows you to use a cheap loudspeaker as a microphone. The circuit is designed to be used with an operating voltage between 6 and 12 volts dc. The first transistor operates in common base mode. This has the advantage of matching the low input impedance of the speaker to the common... The 2 pushbuttons = S1: Start/Pause. S2: Stop/Reset. If you want to play your message, put S3 at Play. Then push S1 to start playing and again to pause. If you want to delete your message press S2 twice. If you want to record a message put S3 at Rec. Then push S1 to start and S2 to stop. This circuit uses a simple technique to eliminate the usual pop sound when an electret type microphone is switched on or off. It is completely passive and will work on dynamic and electret type microphones. This circuit features the ZTX450/ZTX550 transistors in a push-pull output stage. The following readings were taken at maximum volume: Input: 0.4 mV rms, Output: 1.8 V rms, Voltage gain: 4500, Max. output before distortion: 2.25 V rms -supply current ~ 3.5 mA, Zero output-supply current: 3.5 mA, 100 - 108 Mhz Wireless Microphone This low-power FM transmitter will take sound input from the Electret Condensor Microphone and transmit it to a nearby FM radio tuned to a unused area of the dial in the 100 - 108 Mhz region. The microphone is very sensitive and will pick up a wisper in a room. This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusuable in audio stages, but in this case, it allows... Electret Condenser Mic Preamplifier This preamplifier has excellent dynamic range and can cope with anything from a whisper to a loud shout, however care should be taken to make sure that the auxiliary equipment i.e. amplifier or tape deck does not overload. The electret condenser microphone (ECM) contains a very sensitive... A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The opamp used can be any low noise, high performance type, e.g. NE5534,TL071, OPA 371 etc.
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