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Electronics Schematics - T

Transceiver Circuits

14 MHz SSB 10mW Transceiver:

23cm Data Transceiver:

2N2222 40 Meter CW / DSB Transceiver:

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 Array: 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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