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  1. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, You will also need to get the values for the other frequency filters. As far as i know you wanted 16 bands. Bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Those caps will be fine for the filters. Also look for the other filters, so you have one time the ordering costs. As for the 10 uF , electrolitic or tantal can be used. Bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, In filterwizard you can set a gain. The gain will be given in dB. 3 dB = 2 times, 10 dB = 10 times. Bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Why do you want such high values? Audio is not so high. The 2.4 volts range is already quite high. You might even need an amplifier between the filter and rectifier. Bertus
  5. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The voltage divider Rx/Rv1 can adjust the range. Bertus
  6. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The voltage range from that circuit will be from 6 to 8.4 Volts, as the origenal is from 0 to 2.4 Volts. Bertus
  7. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Asking many times won't speed up replies. This is an international forum with members all around the world. Many members are likely in an other timezone as you. Here is a circuit from a link that Delta Prime posted: When you change that to the "lifted to REF" version, you will get...
  8. bertus

    I need help with a circuit

    Hello, IR leds may have different specs than standard leds. There are IR leds that allow peak currents of 100 mA. Read the datasheet of your IR led for a decent current. Have a look at the attached VISHAY datasheets. Bertus
  9. bertus

    Simple 555 Timer

    Hello, I see that the origenal circuit asks for a BT136 You are using a BTA08, wich has a much higher gate current. Compare the datasheets I attached. I have also attached a collection on application notes in one PDF for Thyristors and Triacs. Bertus
  10. bertus

    Comedy Thread

  11. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The Rhi is dependend on the signal you get out of the detector. Set Rhi in such a way that the maximum of the detector shows all leds. Bertus
  12. bertus

    Uneducated question

    Hello, Do you mean the logic inverter? The small cirkel on the output inverts the signal. Bertus
  13. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, No, The V- should go to the - of the 12 Volts. The Rhi could be a value between Ref and +12 Volts. Bertus
  14. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, I would connect the Rlo to the REF. You can likely use one buffer for at least 4 filters. Bertus
  15. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, It is probably the VPN that you are using thet is ginving the problems. Bertus
  16. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, To download the PDF's from All About Circuits, you will need to register. After registration, you can download all pictures and PDF's from over there. Bertus
  17. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Read the following thread on All About Circuits: https://forum.allaboutcircuits.com/threads/decoupling-or-bypass-capacitors-why.45583/ It shows you the use of the decoupling capacitors. They should be as close as possible to the power lines of the opamps. Bertus
  18. bertus

    Uneducated question

    Hello, Wich schematic symbols do you mean? Bertus
  19. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, the simplest envelope detector is a diode with a capacitor and a resistor: https://en.m.wikipedia.org/wiki/Envelope_detector bertus
  20. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Have a look in the LM3915 datasheet I posted. In there are several circuits for envelope/peak detection. Bertus
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