Wireless Transmitter
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Infared Remote Control Transmitter-Receiver
2009-11-11 08:46:00
Here's schematics for infared remotes. This remote transmits a tone using an infared LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no accidental activations. Infrared Remote Control Schematics IR Transmitter schematic: IR Receiver schematic: Remote Control Setup To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click. You can increase range by using a high output LED for LED1. Bright light will stop the receiver from responding to the transmitter. There is an error in the schematic. There should be a 1 megaohm resistor between pin 3 of IC1 and ground. This provides a 0 volt reference to bias the IC. Parts List R1 - 22K 1/4W Resistor R2 - 1 Meg 1/4W Resistor R3 - 1K 1/4W Resistor R4, R5 - 100K 1/4W Resistor R6 - 50K Pot C1, C2 - 0.01uF 16V Ceramic Disk Capacitor C3 -1 100pF 16V Ceramic Disk Capacitor C4 - 0.047uF 16V Ceramic Disk Capacitor C5 - 0.1u
2009-11-11 08:46:00
Here's schematics for infared remotes. This remote transmits a tone using an infared LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no accidental activations. Infrared Remote Control Schematics IR Transmitter schematic: IR Receiver schematic: Remote Control Setup To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click. You can increase range by using a high output LED for LED1. Bright light will stop the receiver from responding to the transmitter. There is an error in the schematic. There should be a 1 megaohm resistor between pin 3 of IC1 and ground. This provides a 0 volt reference to bias the IC. Parts List R1 - 22K 1/4W Resistor R2 - 1 Meg 1/4W Resistor R3 - 1K 1/4W Resistor R4, R5 - 100K 1/4W Resistor R6 - 50K Pot C1, C2 - 0.01uF 16V Ceramic Disk Capacitor C3 -1 100pF 16V Ceramic Disk Capacitor C4 - 0.047uF 16V Ceramic Disk Capacitor C5 - 0.1u
Simple SWR Meter 2.4 GHz
2009-11-11 08:25:00
Here is a simple 2.4 GHz SWR meter which can be easily found, which is based around surplus microwave hardware . The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz. This particular directional coupler above has two ports, each coupled by 20 dB. What that means is, a signal is "coupled" to these ports which is identical to the main signal passing through the directional coupler, only it's attenuated by 20 dB. By placing diode detectors on the outputs of these two ports and comparing the resulting voltages on an oscilloscope, you can quickly determine the integrity of your antenna system in reference to 50 ohms. SWR Meter Diagram How It Works Be sure to measure SWR at the antenna! Feedline loss will attenuate the signal and give you a false SWR reading if you measure it directly at the transmitter's RF output. Don't be like those guys at Field Day who brag about their radio's (internal) SWR reading when
2009-11-11 08:25:00
Here is a simple 2.4 GHz SWR meter which can be easily found, which is based around surplus microwave hardware . The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz. This particular directional coupler above has two ports, each coupled by 20 dB. What that means is, a signal is "coupled" to these ports which is identical to the main signal passing through the directional coupler, only it's attenuated by 20 dB. By placing diode detectors on the outputs of these two ports and comparing the resulting voltages on an oscilloscope, you can quickly determine the integrity of your antenna system in reference to 50 ohms. SWR Meter Diagram How It Works Be sure to measure SWR at the antenna! Feedline loss will attenuate the signal and give you a false SWR reading if you measure it directly at the transmitter's RF output. Don't be like those guys at Field Day who brag about their radio's (internal) SWR reading when
Privacy Policy
2009-05-18 03:32:00
Our Commitment To Your Privacy Your privacy is important to us. To better protect your privacy we provide this notice explaining our online information practices and the choices you can make about the way your information is collected and used. To make this notice easy to find, we make it available on our homepage and at every point where personally identifiable information may be requested. Our Commitment To Data Security To prevent unauthorized access, maintain accuracy, and ensure the correct use of information, we have put in place appropriate physical, electronic, and managerial procedures to safeguard and secure the information we collect online. Our Commitment To Children’s Privacy Protecting the privacy of the very young is especially important. For that reason, we never collect or maintain information at our from those we actually know are under 18, and no part of our website is structured to attract anyone under 18. Under our, children under 18 are no allowed to access ou
2009-05-18 03:32:00
Our Commitment To Your Privacy Your privacy is important to us. To better protect your privacy we provide this notice explaining our online information practices and the choices you can make about the way your information is collected and used. To make this notice easy to find, we make it available on our homepage and at every point where personally identifiable information may be requested. Our Commitment To Data Security To prevent unauthorized access, maintain accuracy, and ensure the correct use of information, we have put in place appropriate physical, electronic, and managerial procedures to safeguard and secure the information we collect online. Our Commitment To Children’s Privacy Protecting the privacy of the very young is especially important. For that reason, we never collect or maintain information at our from those we actually know are under 18, and no part of our website is structured to attract anyone under 18. Under our, children under 18 are no allowed to access ou
Contact me
2009-05-18 03:31:00
How to contact me If you have any questions regarding the content in this weblog, about the products that are mentioned, or just any questions at all don’t hesitate to contact me at the following email address: wirelesstx@telkom.net. I’d also love to hear any feedback on the site if you’ve found it helpful or have some ideas about how I can improve the blog in some way. I will reply to all messages as soon as possible. Admin
2009-05-18 03:31:00
How to contact me If you have any questions regarding the content in this weblog, about the products that are mentioned, or just any questions at all don’t hesitate to contact me at the following email address: wirelesstx@telkom.net. I’d also love to hear any feedback on the site if you’ve found it helpful or have some ideas about how I can improve the blog in some way. I will reply to all messages as soon as possible. Admin