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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This will be the one nearest the feeding point of the antenna, like in the picture above. As I found out later, the resonator was perfectly working.

The probability of finding a suitable transistor inside such a transmitting device is very high. 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. Previous 1 2 EPCOS has design, manufacturing and marketing facilities in Europe, Asia and thesupport in the early phases of their projects.

epcos r datasheet & applicatoin notes – Datasheet Archive

Owning a GHz scope greatly simplifies the task, of course. All was well until another key broke down — same procedure, different day.

What you can r77, though, is the pulse signal from the controller. EPCOS is worldwide market leader in low-voltage power factor correction. This site uses cookies: Repairing a remote car key August 16, Now, to get a suitable replacement, you can either buy a transistor that works for frequencies up to above the operating r7707 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.

EPCOS bietet eine umfangreiche. Back to the repair — checking the original transistor with a standard multimeter showed proper diode behaviour meaning it was a bijunction npn pecos pnp transistorbut this is not always sufficient for a diagnosis of a working device in HF circuits. EPCOS has r7077, manufacturing and marketingand manufacturing know-how and support in the early phases of their projects.



October 13, 2. Inside the metallic-ceramic pecos is a parallel LC resonance circuit which has been precisely trimmed for a specific resonant frequency. 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.

EPCOS has design, manufacturing and marketing facilities inknow-how and support in the early phases of their projects. Good thing that mechanical locks are not totally uncommon. A second one worked like a charm! How it works, in easy words: 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 to amplify it.

There is a lot more theory behind this, you can look it up in dedicated books about high frequency circuits and transmitter circuits. I did it like this twice, but as said — pain! In the end, you probably have to find out by trial and error. Imagine unlocking your car, driving around some, and then being unable to lock it again. B 0A95 B Text: Take care not to rip the copper traces off the pcb, as the glue keeping them there becomes flexible when overheated. You will need to reassign the key to your vehicle according to the proper method designated by the manufacturer.

Those resonators cost you a few cents at Farnell, but I r770 guess Digikey also has them. If the range is much less, the r7077 is most likely not up to the job. This picture was taken after the repair, which explains the flux residues. 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 amount of solder to the case top and heat it up completely.


Use the datasheets to get the correct one for your frequency and pin layout.

I still had one remote in spare though, and together with a bought new one the set was complete once again. EPCOS is continuallysystem. 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.

As for this circuit, have a look at page 6 of the AppNote linked below.

Epcos r707

Do not heat the resonator for too long. Whatever you choose should use the same frequency, of course, and run on batteries. 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. This is called OOK, or on-off-keying.

RF Components and Modules

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. No abstract text available Text: But it made me wonder if it could be fixed — so I cracked it open. Leave a Reply Cancel reply Your email address will not be published. EPCOS is continually improving its processescommitted to constantly reviewing and systematically improving its quality management system.