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Posts tagged BC557

USB to Serial Converter

Making USB to Serial Converter using  Tr BC557 and BC547

Ethernet rs232 Converter

Ethernet rs232 Converter and usb to serial port adapter circuit diagram

12W Power Amplifier circuit

12W Power Amplifier circuit using MB3730

Electronic circuit diagram audio amplifier AN7125 13w

Electronic circuit diagram audio amplifier AN7125 13w

Phone Broadcaster and Telephone Circuits

Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this circuit is that the circuit derives its power directly from the active telephone lines, and thus avoids use of any external […]

ptc speaker protection

ptc speaker protection

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