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Inside a very common style of remote control button - with schematic
These buttons are often supplied in packs with various receivers. This one is 433MHz, which is fairly universal.
The circuitry in this unit is quite unusual and manages to give a quiescent current of zero without requiring that the miniature button passes the full circuit current.
The control chip used is an EV1527 which is factory programmed with one of over a million base codes, and then that can be added to by choosing one of 15 auxiliary codes on the PCB. Just 15 because it needs at least one of the four programming links in place to power the transistor. (although a resistor could be added to the negative rail for the last code). All a moot point, since the receivers can usually accept any code.
The RF section consists of an RF oscillator with what I would guess is a tuned 433MHz resonator and matching components to ensure that 433MHz is the sweet spot. The oscillator then drives an RF amplifier that has the antenna on its output.
The RF posse will probably be able to name the specific oscillator and amplifier configurations.
This seems to be a very universal button. It has what looks like a lanyard option for an emergency call button, positions for screws on the base to attach it to surfaces and a double sided foam pad for easy mounting.
Note that this is a fixed code transmitter and can be "learned" by a remote sniffing device, so it shouldn't be used for anything requiring security. It won't work with code hopping receivers as used in cars and other secure applications.
It seems quite a nice design.
If you enjoy my videos, you can help support the channel with a dollar or two for coffee, cookies and gadgets, and keep it independent from the quirks of the YouTube algorithm by supporting me on Patreon. This also lets me link to my content on other platforms if YouTube uses the ban-hammer (again!)
I release content for critique and feedback on Patreon as soon as it has been made.
https://www.patreon.com/bigclive
Alternatively, for a single contribution you can use PayPal:-
https://www.paypal.com/paypalme/bigclive
#ElectronicsCreators
...
https://www.youtube.com/watch?v=fzQX9PZMnN0
The circuitry in this unit is quite unusual and manages to give a quiescent current of zero without requiring that the miniature button passes the full circuit current.
The control chip used is an EV1527 which is factory programmed with one of over a million base codes, and then that can be added to by choosing one of 15 auxiliary codes on the PCB. Just 15 because it needs at least one of the four programming links in place to power the transistor. (although a resistor could be added to the negative rail for the last code). All a moot point, since the receivers can usually accept any code.
The RF section consists of an RF oscillator with what I would guess is a tuned 433MHz resonator and matching components to ensure that 433MHz is the sweet spot. The oscillator then drives an RF amplifier that has the antenna on its output.
The RF posse will probably be able to name the specific oscillator and amplifier configurations.
This seems to be a very universal button. It has what looks like a lanyard option for an emergency call button, positions for screws on the base to attach it to surfaces and a double sided foam pad for easy mounting.
Note that this is a fixed code transmitter and can be "learned" by a remote sniffing device, so it shouldn't be used for anything requiring security. It won't work with code hopping receivers as used in cars and other secure applications.
It seems quite a nice design.
If you enjoy my videos, you can help support the channel with a dollar or two for coffee, cookies and gadgets, and keep it independent from the quirks of the YouTube algorithm by supporting me on Patreon. This also lets me link to my content on other platforms if YouTube uses the ban-hammer (again!)
I release content for critique and feedback on Patreon as soon as it has been made.
https://www.patreon.com/bigclive
Alternatively, for a single contribution you can use PayPal:-
https://www.paypal.com/paypalme/bigclive
#ElectronicsCreators
...
https://www.youtube.com/watch?v=fzQX9PZMnN0
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By bigclivedotcomThese buttons are often supplied in packs with various receivers. This one is 433MHz, which is fairly universal.
The circuitry in this unit is quite unusual and manages to give a quiescent current of zero without requiring that the miniature button passes the full circuit current.
The control chip used is an EV1527 which is factory programmed with one of over a million base codes, and then that can be added to by choosing one of 15 auxiliary codes on the PCB. Just 15 because it needs at least one of the four programming links in place to power the transistor. (although a resistor could be added to the negative rail for the last code). All a moot point, since the receivers can usually accept any code.
The RF section consists of an RF oscillator with what I would guess is a tuned 433MHz resonator and matching components to ensure that 433MHz is the sweet spot. The oscillator then drives an RF amplifier that has the antenna on its output.
The RF posse will probably be able to name the specific oscillator and amplifier configurations.
This seems to be a very universal button. It has what looks like a lanyard option for an emergency call button, positions for screws on the base to attach it to surfaces and a double sided foam pad for easy mounting.
Note that this is a fixed code transmitter and can be "learned" by a remote sniffing device, so it shouldn't be used for anything requiring security. It won't work with code hopping receivers as used in cars and other secure applications.
It seems quite a nice design.
If you enjoy my videos, you can help support the channel with a dollar or two for coffee, cookies and gadgets, and keep it independent from the quirks of the YouTube algorithm by supporting me on Patreon. This also lets me link to my content on other platforms if YouTube uses the ban-hammer (again!)
I release content for critique and feedback on Patreon as soon as it has been made.
https://www.patreon.com/bigclive
Alternatively, for a single contribution you can use PayPal:-
https://www.paypal.com/paypalme/bigclive
#ElectronicsCreators
...
https://www.youtube.com/watch?v=fzQX9PZMnN0
The circuitry in this unit is quite unusual and manages to give a quiescent current of zero without requiring that the miniature button passes the full circuit current.
The control chip used is an EV1527 which is factory programmed with one of over a million base codes, and then that can be added to by choosing one of 15 auxiliary codes on the PCB. Just 15 because it needs at least one of the four programming links in place to power the transistor. (although a resistor could be added to the negative rail for the last code). All a moot point, since the receivers can usually accept any code.
The RF section consists of an RF oscillator with what I would guess is a tuned 433MHz resonator and matching components to ensure that 433MHz is the sweet spot. The oscillator then drives an RF amplifier that has the antenna on its output.
The RF posse will probably be able to name the specific oscillator and amplifier configurations.
This seems to be a very universal button. It has what looks like a lanyard option for an emergency call button, positions for screws on the base to attach it to surfaces and a double sided foam pad for easy mounting.
Note that this is a fixed code transmitter and can be "learned" by a remote sniffing device, so it shouldn't be used for anything requiring security. It won't work with code hopping receivers as used in cars and other secure applications.
It seems quite a nice design.
If you enjoy my videos, you can help support the channel with a dollar or two for coffee, cookies and gadgets, and keep it independent from the quirks of the YouTube algorithm by supporting me on Patreon. This also lets me link to my content on other platforms if YouTube uses the ban-hammer (again!)
I release content for critique and feedback on Patreon as soon as it has been made.
https://www.patreon.com/bigclive
Alternatively, for a single contribution you can use PayPal:-
https://www.paypal.com/paypalme/bigclive
#ElectronicsCreators
...
https://www.youtube.com/watch?v=fzQX9PZMnN0