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Desktop Microphone
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Characteristics of Loud Speaker & Microphone SD-218
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Product Category : Audio, Video, Radio, Television Lab Trainer (Series : 200-D)Product Name : Characteristics of Loud Speaker & MicrophoneModel No. : SD-218Product Details This has Built-In DC +12V/500mA regulated fixed Power supply. For Microphone: Condenser type microphone wired with resistive network and fixed DC supply to study the characteristics of microphone w.r.t. applied external sound input. For Loud Speakers: Three types of speakers Woofer, Midrange and Tweeter to be wired with respective three way cross-over network to study the frequency response of these speakers for the applied external AF input. All Enclosed in High Quality Poly coated wooden box. Test Points to observe all corners of experiment. Objectives : To Study Symbols of Loudspeakers and Microphone. To Study the frequency response of Microphone w.r.t. applied variable AF sound input. To Observe the various types of loud Speakers like Woofer, Midrange and Tweeter. To Study the different Parts of Speakers. To Study the three way Cross-over network. To Study the frequency response of Woofer, Midrange and Tweeter w.r.t. applied AF input. Accessories Included : Set of Patch cords and detailed Instruction manual.
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Cordless FM Mike
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Cordless FM Mike can effectively achieve 10-20mtr receptions from transmitters. You can listen your sound in any FM radio (Receiver) by tuning radio frequency in between 88 to 108 MHz. This FM circuit uses a medium power VHF oscillator built around BC547 transistor. The BC series transistors frequency is 200-250MHz.These can oscillate well in VHF range.Audio is picked up from the room by an condenser microphone and transmit by T1. 10K resistor (R1) supplies the bias voltage for the microphone. A varicap based circuit is used for good quality frequency modulation. Operational frequency can be altered by adjusting spacing of coil L1. L1,C4 from LC circuit to produce oscillations. Coil L1 consists of 20 SWG wire, space wound air core. Antenna tap is taken at one turn from bottom end. By using 7cms wire arial, range up to 10 meters may be expected. The range can be extended by using a multi-element ground plane antenna. Output power of the transmitter can be raised by lowering value of resistor R5 connected between emitter of transistor T1 and ground to, say 27 to 39 ohms.
