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  1. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, a short between pin 5 (input) and pin 6 (high end) would also cause all leds to burn. bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, at 0 volts no led should burn. at 2.4 volts all leds should burn. bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, when you measure between pin 5 and ref, you should measure a value between 0 an 2.4 volts for 0 to all leds. bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, measure the voltage on the inputs of the lm3914's (pin 5) bertus
  5. bertus

    circuit breaker alarm

    Hello, Perhaps a transistor buffer might help, like in this circuit: https://www.gadgetronicx.com/anti-theft-alarm-circuit-ic-741/ Bertus
  6. bertus

    circuit breaker alarm

    Hello, How much current does the buzzer take? Are there specifications of the buzzer? If the current of the buzzer is to high, the opamp may break. Bertus
  7. bertus

    circuit breaker alarm

    Hello, Wich opamp are you using? Wich buzzer are you using? It can be that the buzzer broke the opamp. Bertus
  8. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The following picture might help you reading the resistor color codes: Bertus
  9. bertus

    Building a linear 5v 5a powersupply for Raspberry pi streamer build.

    Hello, You might want to read the attached PDF about rectifiers and buffer capacitors. Bertus
  10. bertus

    Building a linear 5v 5a powersupply for Raspberry pi streamer build.

    Hello, How did you connect the transformer? There are two ways to use the two secondary outputs. This picture shows the possibilities from an ILP datasheet: I have drawn the centre tap in the bottom picture. Bertus
  11. bertus

    How does this happen?

    Hello, I see that you are using the default style. The date you are pointing at is the birthdate of the user. In the "maker pro retro" I am using, the date does not show. You can switch to an other style in the preferences in your profile. Bertus
  12. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, the lm3914 of the filters connected to the ref circuit can also be connected to the same ref circuit. that way there will be no offset between the filter and lm3914. bertus
  13. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, In the datasheet on page 7 the following is stated: In order for the display to make sense when multiple LM3914s are cascaded in dot mode, special circuitry has been included to shut off LED No. 10 of the first device when LED No. 1 of the second device comes on. The con- nection for...
  14. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, the 22 k is given in the datasheet schematic. it could be it is used for the two stage system. check the comment in the datasheet. bertus
  15. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, yes, term 1 goes to the connection point of the 12 k and 10 uf. bertus
  16. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, term 1 is signal, where the resistor is connected term 2 is ground bertus
  17. bertus

    Auto shut off circuit

    Hello, NE555 and LM555 are basicaly the same but different manufactures. The LMC555 is a cmos version, that can not drive the sirene. @AnalogKid , should pin 8 also be connected to the 12 Volts? Bertus
  18. bertus

    Book Reviews

    Hello, WorldRadioHistory has a large collection of old books: https://www.worldradiohistory.com/Home-Book.htm Bertus
  19. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, have a look at the discussion from the posts 500 and on. rx is made 1k and the pot is removed. also a buffer was added. bertus
  20. bertus

    Thanks Harald Kapp

    Hello, I know that Harald has made a lot of resources. There are many more resources in the resources section: https://maker.pro/forums/resources/ There are many users who made these resources: https://maker.pro/forums/members/?key=xfrm_most_resources Bertus
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