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| Three transformer stages switch in automatically, so the pass transistor only ever drops the minimum. A Power-MOS rectifier and voltage doub...

| An FM IF amplifier IC becomes a shortwave propagation meter. Instead of tuning a station, the CA3089's logarithmic RSSI output on pin 13 mea...

| Run two RS232 terminals in parallel on a single serial host — no power supply, no null-modem cable. A diode matrix isolates both transmit li...