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Schematic diagram for a broadband QRP SWR metering circuit and SSB TRANSCEIVER 80M / 40M boster filter IF Radio

A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light.

8800 phone

Nokia 8800 phone radio module / circuit using TEA5761UK Nokia 8800 phone radio module / circuit using TEA5761UK

5 Channel Portable Audio Mixer

5 Channel Portable Audio Mixer Audio Mixer schema using c945  

Audio Amplifier Circuit Using STK4151 II

Audio Amplifier Circuit Using STK4151 II

Auto battery charger circuit

Auto battery charger circuit diagram schematic 6V-12V using NE555, LM7812, 2SA671, 1N4002, BC549 auto battery charger circuit On a lithium-ion cell, 3.8V/cell indicates a state-of-charge of about 50%. It must be noted that utilizing voltage as a fuel gauge function is inaccurate because cells made by different manufacturers produce a slightly different voltage profile. This […]

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