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Transceiver Circuits

14 MHz SSB 10mW Transceiver
23cm Data Transceiver
2N2222 40 Meter CW / DSB Tranceiver
30M PSK31 Transceiver
49MHz Walkie Talkie
5 Watt, 80 Meter QRP CW Transceiver
56K RF Modem
900Mhz 9600bps Link
Ampli MOSFET:  DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms
HeNe Laser Transmitter / Receiver
Laser Transmitter/receiver
Mains Remote Alert:  Remotely-operates a Beeper and/or a LED via mains supply line Simple Circuitry, easy to build unit
Passive Filters Fill the Bill At Audio Frequencies:  02/01/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.
Single FET Controls LED Arrray:  04/12/01 EDN-Design Ideas /  PDF contains multiple circuits - scroll to find the one of interest / White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL (cold-cathode-fluorescent-lamp) and EL (electroluminescent) technology. This circuit shows a switch-mode boost design that regulates current instead of voltage and switching off individual LEDs or groups of LEDs is not a problem




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