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  1. bertus

    Testing Operational Amplifiers

    Hello, The LM741 is a single opamp. The LM747 is a dual opamp. I have attached several datasheets. Bertus
  2. bertus

    My T-Board Keyboard, my first PCB, and my experience with OsmondPCB...

    Hello, You can make a showcase on this site. It shows a lot of project logs. Use the add item button to start yours: https://maker.pro/forums/projectlogs/ Bertus
  3. bertus

    ECG circuit digram with AD620 and 741 op amp as a gain differentiator

    Hello, These pages will give you the explanation: https://en.wikipedia.org/wiki/Rhythm_interpretation https://www.wikilectures.eu/w/Electrocardiogram Bertus
  4. bertus

    Removing microprocessor

    Hello, Y1 is the criystal. Do you mean the part with ALF written on it, uner the kevlar foil? It could be a part with ball soldering, wich needs special tools to remove, like a kind of oven. The exact name is Ball Grid Array: https://en.wikipedia.org/wiki/Ball_grid_array Bertus
  5. bertus

    Removing microprocessor

    hello, is it the same board as in this thread: https://maker.pro/forums/threads/hardened-insulation.298532/ if the microprocessor is in the blob, it can not be removed without damage. bertus
  6. bertus

    Op-Amp voltage follower output different from input

    Hello, Have a look at this page: https://e2e.ti.com/blogs_/archives/b/thesignal/posts/the-unused-op-amp-what-to-do Or this page: https://www.stg-maximintegrated.com/en/design/technical-documents/app-notes/1/1957.html Bertus
  7. bertus

    Trying to identify Vishay SMD from markings on reel

    Hello, The R67 has to do with the packaging. Have a look at page 3 of the attached PDF: This table has a "translation" to the new numbers. Bertus
  8. bertus

    Trying to identify Vishay SMD from markings on reel

    Hello, Does this help? https://www.digipart.com/part/CRCW2512680J Part #CRCW2512-680JR67 - Resistor Chip FIXED RESISTOR, METAL GLAZE/THICK FILM, 1W, 68OHM, 500V, 5% +/-TOL, 200PPM/CEL, SURFACE MOUNT, 2512 Bertus
  9. bertus

    Boost converter

    Hello, The datasheet shows a minimum input voltage of 5 Volts, wich is also stated on this page for the module: https://www.tinytronics.nl/shop/en/power/voltage-converters/boost-%28step-up%29-converters/dc-dc-adjustable-step-up-boost-converter-xl6009-4a Having a lower input voltage may give...
  10. bertus

    Sam labs project making

    Hello, Are you refering to this: https://samlabs.com/us/ Do you have an account? It needs a payed subscribtion. Bertus
  11. bertus

    Looking for suggested dynamic microphone power level

    Hello, @HANKMARS , I deleted a spampost in this thread. The system sends an email when someone posts in a thread where you have an email notification set. The email was already sent before I deleted the post. Bertus
  12. bertus

    Curious?

    Hello, The thread was deleted on request of the topic starter for privacy issues. This only happens rarely, as we try to conserve as many as possible. Bertus
  13. bertus

    Comedy Thread

  14. bertus

    From SMD tactile switch to 4 pin connector

    Hello, What are the dimentions of the current switches? There seem to be several sizes around. Farnell seems to carry some 4 pin smd connectors...
  15. bertus

    From SMD tactile switch to 4 pin connector

    Hello, Usualy only 2 pins make the contacts. See this page for more info: https://multitron.co.uk/keypad-components/smd-tactile-switches/ You could use 2 pin connectors to extend the wiring. Bertus
  16. bertus

    From SMD tactile switch to 4 pin connector

    Hello, Can you post a picture of the board? Do you want to have off-board switches? That way we can have an idea of waht you are trying to do. Bertus
  17. bertus

    Siren circuit

    Hello, From wich book does the circuit come? Lowering the 10K to 6k8 will change the tone. Lowering the 100 Ohms to 3X10 Ohms will have a higher output, but may stess the transistors. Bertus
  18. bertus

    mysterious tools

    Hello, That is quite a mess. Most parts on the PCB are broken: It looks like the remainings of an USB charger. Bertus
  19. bertus

    Does anyone recognize this company logo?

    Hello, A search delivers : Souriau USA Inc. Not the direct number, but the series: https://www.parttarget.com/Souriau-USA-Inc_nsn-parts_29JP135-1_UPC100AMR49P1.html Bertus
  20. bertus

    Onkyo TX SV717PRO

    Hello, This is an English only forum. Google translation: Good evening everyone, I saw an old post on this device on the forum, I have the problem that when I go to turn it on it does not always do it. Sometimes the ignition relay is repeatedly excited and does not turn on. I saw you since Mr...
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