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https://onlinetps.com/shop/Integrated-Circuits-ICs/CMOS%20-TTL-Logic-ICs/74LS139-High-Speed-Dual-1-of-4-Decoder-Demultiplexer-DIP

74LS139 High-Speed Dual 1-of-4 Decoder/Demultiplexer DIP - Versatile Digital Logic Component for Electronics Projects 74LS139 - High-Speed Dual 1-of-4 Decoder Demultiplexer DIPFeatures Two Independent Two-of-Four Decoders Based Upon the Select InputsInputs Clamped with Schottky DiodesDesigned for Memory Decoders and Data Transmission SystemsOperating Temperature up to 70oCStandard TTL Switching VoltagesVCC Suppl

https://onlinetps.com/shop/Integrated-Circuits-ICs/Amplifier-ICs/LM348-Quad-741-Op-Amps-SMD-Package

LM348 Quad 741 Op Amps in SMD Package - High-Precision Signal Processing Solution for Electronic Circuits

https://onlinetps.com/shop/index.php?route=product/product&product_id=884&search=CHOKE&description=true
In electronics, a choke is an inductor used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC). A choke usually consists of a coil of insulated wire often wound on a magnetic core, although some consist of a doughnut-shaped "bead" of ferrite material strung on a wire. The choke's impedance increases with frequency. Its low electrical resistance passes both AC and DC with little power loss, but it can limit the amount of AC due to its reactance.

Inductor Choke and Coils Set for Electronics Power Supply – Essential Components for Filtering and Regulating Current In electronics, a choke is an inductor used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC). A choke usually consists of a coil of insulated wire often wound on a magnetic core, although some consist of a doughnut-shap

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Total Project Solutions Welcome to the world of electronics, with the tagline, Components at your Doorstep, at OnlineTPS we strive to satisfy the needs and requirement of electronics enthusiasts, who are constantly developing and inventing new circuits.

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Here is a simple circuit for Homemade Computer Microphone .only three components are required to build this
http://onlinetps.com/resources/computer_mic.htm