Difference between revisions of "Audio signal and RF switching"
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Low noise RF switching is needed to allow multiple audio and video inputs switched by software. I have a TV with one video input. I already have a DVD player, so the use of a media center in this situation will not be very friendly because of the need to switch inputs manually. | Low noise RF switching is needed to allow multiple audio and video inputs switched by software. I have a TV with one video input. I already have a DVD player, so the use of a media center in this situation will not be very friendly because of the need to switch inputs manually. | ||
| − | An RF switch with multiple audio and video inputs and a single audio/video output would allow | + | An RF switch with multiple audio and video inputs and a single audio/video output would allow software to control which outputs are sent to the TV. In this way the remote control can be used to select from a number of existing video sources or the computer or TV. |
| − | The switch would also need a default switched state. In | + | The switch would also need a default switched state. In the case where the pc is asleep the hardware could still select a default switch path to allow the use of the DVD player when the software was not able to respond. |
| + | =Circuit= | ||
| + | Simple transistor based amplifier drives the relay based on one of the Micro's digital pins. | ||
| + | *http://www.scienceprog.com/drive-relay-with-avr-microcontroller/ | ||
| + | *http://www.windmeadow.com/node/4 | ||
| + | = Parts list = | ||
| + | *5v relay DPDT V23105 | ||
| + | *5V relay SPST [http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=111448 Bestar BR-500] | ||
| − | |||
*Vero board | *Vero board | ||
*rca sockets female pcb board mount (colours red, white, yellow) | *rca sockets female pcb board mount (colours red, white, yellow) | ||
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*[http://zone.ni.com/devzone/cda/tut/p/id/2892 Good tutorial on RF switching considerations] | *[http://zone.ni.com/devzone/cda/tut/p/id/2892 Good tutorial on RF switching considerations] | ||
*[http://www.fairchildsemi.com/pf/FM/FMS6501.html Switch components] | *[http://www.fairchildsemi.com/pf/FM/FMS6501.html Switch components] | ||
| + | *[http://jap.hu/electronic/avswitch.html schematic for 8 way switch] | ||
| + | **[http://www.fairchildsemi.com/pf/CD/CD4051BC.html CD4051BC Single 8-Channel Analog Multiplexer/Demultiplexer] | ||
| + | **[http://www.arndt-electronics.com/products/49779.php 74174 Hex D-type flip-flop with clear] | ||
Latest revision as of 01:13, 12 March 2007
Low noise RF switching is needed to allow multiple audio and video inputs switched by software. I have a TV with one video input. I already have a DVD player, so the use of a media center in this situation will not be very friendly because of the need to switch inputs manually.
An RF switch with multiple audio and video inputs and a single audio/video output would allow software to control which outputs are sent to the TV. In this way the remote control can be used to select from a number of existing video sources or the computer or TV. The switch would also need a default switched state. In the case where the pc is asleep the hardware could still select a default switch path to allow the use of the DVD player when the software was not able to respond.
Circuit
Simple transistor based amplifier drives the relay based on one of the Micro's digital pins.
Parts list
- 5v relay DPDT V23105
- 5V relay SPST Bestar BR-500
- Vero board
- rca sockets female pcb board mount (colours red, white, yellow)
