BRU from EPCOS AG. Find the PDF Datasheet, Specifications and Distributor Information. epcos r datasheet, cross reference, circuit and application notes in pdf format. R ,92 MHz. Abstract: R epcos r SM r SAW R SAW R sm r R EPCOS r saw S M R Text: Competitor P/N (MHz).

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RF Components and Modules

What you can measure, though, is the pulse signal from the controller. I have noted the designation of the found replacement in the picture above.

Do not heat the resonator for too long. This signal is fed into the resonator through a resistor and a capacitor, and from the resonator back through said capacitor to the base of the output transistor. Whatever you choose should use the same frequency, of course, and run on batteries. This is called OOK, or on-off-keying.

As I found out later, the resonator was perfectly working. If the range is much less, the transistor is most likely not up to the job.

epcos r datasheet & applicatoin notes – Datasheet Archive

Principles of SAW resonator stabilized oscillators and transmitters No related posts. EPCOS is continually improving its processescommitted to constantly reviewing and systematically improving its quality management system. The signal generated by the microcontroller is a digital pulse signal containing the remote code. In the end, you probably have to find out by trial and error. But, to be fair, they were not really designed for it.

EPCOS R Datasheet(PDF) – BJA – EPCOS

EPCOS r7707 design, manufacturing and marketing facilities in Europe, Asia and thesupport in the early phases of their projects. Good thing that mechanical locks are not totally uncommon. Those resonators cost you a few cents at Farnell, but I would guess Digikey also has rr707. Owning a GHz scope greatly simplifies the task, of course. Repairing a remote car key August 16, Now, as the resonator…well…resonates at its designed frequency, excited by the impulse coming through the capacitor when the controller pin turns ON, the resonance waveform is coupled into the base of the transistor, which in turn amplifies it and pushes it out onto the antenna.


What you get is a high frequency signal during each high-level time of the remote code signal and no signal during each low-level time. A second one worked like a charm! Imagine repeatedly hitting a tuning fork with a small hammer and touching it to stop the vibration in a certain pattern while picking up the generated sound with a microphone eppcos amplify it.

How it works, in easy words: Take care not to rip the copper traces off the r770, as the glue keeping them there becomes flexible when overheated. October 13, 2.

The probability of finding a suitable transistor inside such a transmitting device is very high. Now, to get a suitable replacement, you can either buy a transistor that works for frequencies up to above the operating frequency of your device and has the same pinout — or you can simply go look for a cheap remote controllable wall socket, wireless weather station or the likes. I still had one remote in spare though, and together with rpcos bought new one the set was complete once again.

Try Findchips PRO for epcos r Inside the metallic-ceramic casing is a parallel LC resonance circuit which has been precisely trimmed for a specific resonant frequency.

The current types are mostly pin compatible to the old ones. It can be seen as r077 extreme example of amplitude modulation AMand the principle is identical to the way TV remotes work — only that RF is used instead of IR light.

Use hot air or reflow techniques if you can, or else heat the ground plane from the side, OR remove the resonator by applying a small 7r07 of solder to the case top and heat it up completely. The output to the antenna the copper strip along the left edge appeared near-zero and the pulse signal after the coupling resistor was pretty deformed, too.


Your email address will not be published. While there wpcos other manufacturers like RFM, these models seem to be a pretty common brand for such keys as far as I have seen.

There is a lot more theory behind this, you can look it up in dedicated books about high frequency circuits and transmitter circuits. I had to try two different transistors, the first one was probably already dead before transplantation I already wondered why I never used that remote control.

EPCOS is continuallysystem. Previous 1 2 This will be the one nearest the feeding point of the antenna, like in the picture above. Reproduction, publication and dissemination of this data sheet, enclosures hereto and the information contained therein without EPCOS ‘ prior express consent is prohibited.

I did it like this twice, but as said — pain! The resistor limits the output impedance of the controller pin to prevent it from clamping the transistor base to a fixed voltage and allow the resonator to overlay an AC component onto the DC voltage. No abstract text available Text: This picture was taken after the repair, which explains the flux residues. To solder on the new one, place it onto the cleaned pads and flow solder underneath the e;cos from the side, for each dpcos individually.

EPCOS is worldwide market leader in low-voltage power factor correction.