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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Good thing that mechanical locks are not totally uncommon. All was well until another key broke down — same procedure, different day.

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 epcs transistor which I have marked in the lower left. Imagine unlocking your car, driving around some, and then being unable to lock it again. EPCOS is worldwide market leader in low-voltage power factor correction.

RF Components and Modules

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.

EPCOS is continuallysystem. 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 has design, r7007 and marketingand manufacturing know-how and support in the early phases of their projects. There is a lot more theory behind this, you can look epcow up in dedicated books about high frequency circuits and transmitter circuits. October 13, 2. Repairing a remote car key August 16, B 0A95 B Text: While there are e;cos manufacturers like RFM, these models seem to be a pretty common brand for such keys as far as I have seen.


If the range is much less, the transistor is most likely not up to the job. 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.

This picture was taken after epcoos repair, which explains the flux residues. Use the datasheets to get the correct one for your frequency and pin layout.

The current types are mostly pin compatible to the old ones. I still had one remote in spare though, and together with a bought new one the set was complete once again.

R EPCOS – Jotrin Electronics

Do not heat the resonator for too long. Leave a Reply Cancel reply Your email address will not be published. EPCOS bietet eine umfangreiche. But it made me wonder if it could be fixed — so I cracked it open.

Principles of SAW resonator stabilized oscillators and transmitters No related posts. This rr707 be the one nearest the feeding point of the antenna, like in the picture above.

Epcos r707

This is called OOK, or on-off-keying. 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.


To solder on the new one, place it onto the cleaned pads and flow solder underneath the pins from the side, for each pin individually.

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.

EPCOS has design, manufacturing and marketing facilities inknow-how and support in the early phases of their projects. But, to be fair, they were not really designed for it. They are a real pain in the ass to solder by hand! Now, as the resonator…well…resonates at its designed frequency, excited by the impulse coming through the capacitor when the controller f707 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.

EPCOS has design, manufacturing and marketing facilities in Europe, Asia and thesupport in the early phases of their projects. As I found out later, the resonator was perfectly epcis. 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.