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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How it works, in easy words: EPCOS is worldwide market leader in low-voltage power factor correction. What you can measure, though, is the pulse signal from the controller. As I found out later, the resonator was perfectly working. Use the datasheets to get the correct one for your frequency and pin layout.

EPCOS is continually improving its processes and thus theconstantly reviewing and systematically improving its quality management system. 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.

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 epos DC voltage. 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.

RF Components and Modules

This site uses cookies: This will be the one nearest the feeding point of the antenna, like in the picture above. I still had one remote in spare though, and together with a bought new one the set was complete once again.


Imagine unlocking your r770, driving around some, and then being unable to lock it again. Owning a GHz scope greatly simplifies the task, of course.

Those resonators cost you a few cents at Farnell, but I would guess Digikey also has them. This picture was taken after the repair, which explains the flux residues.

Try Findchips PRO for epcos r They are a real pain in the ass to solder by hand! Back to the repair — checking the original transistor with a standard multimeter showed proper diode behaviour meaning it was a bijunction npn or pnp transistorbut this is not always sufficient for a diagnosis of a working device in HF circuits. I did it like this twice, but as said — pain! You will need to reassign the key to your vehicle according to the proper method designated by the manufacturer.

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.

There is a lot more theory behind this, you can look it up in dedicated books about high frequency circuits and transmitter circuits. I swapped it anyways — even swapped the old one back once I found the error — to make sure, but the real culprit was the HF output transistor which I have marked in the lower left. Repairing a remote car key August 16, EPCOS has design, manufacturing and marketing facilities inknow-how and support in the early phases of their projects.


While there are other manufacturers like RFM, these models seem to be a pretty common brand for such keys as far as I have seen. EPCOS has design, manufacturing and marketingand manufacturing know-how and support in the early phases of their projects.

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.

But, to be fair, they were not really designed for it.

Your email address will not be published. But it made me wonder if it could be fixed — so I cracked it open. As for this circuit, have a look at page 6 of the AppNote linked below. Good thing that mechanical locks are not r77 uncommon. Previous 1 2 The current types are mostly pin compatible to the old ones.

R+,92+MHz datasheet & applicatoin notes – Datasheet Archive

Principles of Epocs resonator stabilized oscillators and transmitters No related posts. 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. EPCOS bietet eine umfangreiche.