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+'for Sale : Speech Amplifier Box, Metro Manila, Manila

Category:

For Sell

Sub-Category:

Mobiles & Accessories

State / county:

Metro Manila

City:

Manila

Area (locality):
Date posted:

08 Nov, 2011

Contact person:
Contact number:
Website:

Description


Description. This circuit given here can be housed in the box containing the speaker to form a handy microphone amplifier.The device can be used by teachers,guides,lecturers etc for speaking in a crowdy or noisy environment.The circuit is designed base on the audio power amplifier IC TDA 7052.The IC can deliver a maximum power output of 1.2 W at a 6V supply.The audio signal from the microphone is pre amplified by the amplifier based on Q1 (BC 547) and give to the input of IC1 (pin 2).The POTR5 acts as a volume control.The capacitor C3 is used to bye pass the upper frequencies in order to avoid the Larsens effect(the microphone picking up speaker output to cause howls).Notes.* Use a 8 Ohm speaker or two 4 Ohm speakers in series as load. * Assemble the circuit on a good quality PCB or common board. * A 6V SMF battery is my choice for powering the circuit. * Switch S1 can be used as a ON/OFF switch.Color available : BlackSHIPPING POLICY: 1. SHIPPING FEE MUST BE HANDLED BY THE BUYER. (Shipping cost will vary on the weight of the item/s) 2. SETTLE YOUR AMOUNT/PAYMENT AT LBC. 3. TRACKING NUMBER WILL BE SEND THRU SMS. 4. OFFICIAL CARRIER AIR21 or LBC 5. Shipping schedule everyday except Sunday and Holidays.for more info just visit www.cebucoolestgadgets.multiply.comPrice: 1499php Contact # 09474306012

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+'for Sale : Speech Amplifier Box, Metro Manila, Manila

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