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Building an RF remote control system ... Using these RF transmitter & receiver circuits with a Microcontroller would be simple. We can simply replace the switches used for selecting data on the HT-12E with the output pins of the microcontroller. Also we can use another output pin to select TE, or transmit enable on the HT-12E.
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www.rentron.com/RF-Remote.htm
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Construction of the Transmitter Circuit ... Soldering leads to the switch ... LED Current Limiter Design...
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www.ee.duke.edu/~cec/final/node72.html
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The circuit (transmitter and receiver) use few components and ordinary (I love few component circuits) . Its easy to build it because you don't have to tune-up any coil or variable capacitor. The RF modules are fix to work in 418MHz area.
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www.discovercircuits.com/R/rftrans.htm
www.discovercircuits.com/R/rftrans.htm
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434 MHz ASK/OOK AM transmitter/receiver ... manufacturer name frequency; (MHz) modulation transmitter receiver transceiver chip remarks ... Single-chip RF transmitter/receiver integrated circuits...
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jap.hu/electronic/rf.html
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Click on the transmitter buttons and see how the receiver outputs change. Change transmitter or receiver version. Alter the receiver output type. Containing a PIC microcontroller, the circuit is ... If you have trouble with programming PIC microcontrollers, you can consider builing other circuits based on Holtek HT-12D,
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jap.hu/electronic/codec.html
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What is claimed is: 1. A receiver/transmitter circuit, comprising: an antenna terminal; a transmitter circuit which outputs a transmission signal in response to a transmit control signal; areceiver circuit which receives a reception signal from the antenna terminal;
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www.patentstorm.us/patents/7203465/claims.html
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View Patent Images: ... Images are available in PDF form when logged in. To view PDFs, Login or Create Account (Free!) ... 2408826 Combined frequency modulation radio transmitter and receive...
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www.freepatentsonline.com/2447392.html
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A UHF transmitter in the 868MHz band having to meet ETS300 220 for a 25kHz channel, may require a stability of better than +/- 3ppm, (better if maximum ... A further advantage of using an IF is that more gain can be introduced into the receiver chain without instability occurring due to feedback into the input circuits.
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www.avren.com/Courses/TX_RX_Architectures_plain.htm
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Simple IR transmitter and receiver circuits ... The circuit can be also used for slow serial data transfer by connecting RS-232 data output to the transmitter module left/right control pin and connect the output of GP1U52X receiver module to RS-232 data input through suitable RS-232 buffer circuit.
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www.tkk.fi/Misc/Electronics/circuits/ir_send.html
www.tkk.fi/Misc/Electronics/circuits/ir_send.html
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