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  1. bertus

    555 output question

    Hello, The schematic that you posted is from this version of the book: https://archive.org/details/electronicsfordummies_201910 When you look at the partlist on page 310, C3 is not mentioned: Bertus
  2. bertus

    555 output question

    Hello, Strange, the book I got shows a different circuit: There is no resistor / capacitor combination on the output. Bertus
  3. bertus

    I'm Back- sort of

    Hello, Perhaps this circuit might interest you: It has a lot of tweaking possebilities. The schematic comes from this page with more details: http://diy-fever.com/effects/the-ultimate-overdrive/ Bertus Bertus
  4. bertus

    555 output question

    Hello, Could you post a schematic? You can upload picture files upto 300 kB. Bertus
  5. bertus

    Tape speed

    Hello, There are so called "speed calibration" cassettes available. https://www.duplication.ca/audio-cassette-speed-calibration-test-tape.html https://fixyouraudio.com/product/speed-calibration-tape/ Peter vis has a page how to use them: https://www.petervis.com/Vintage Misc/Vintage...
  6. bertus

    Tape speed

    Hello, From private messages from the TS: Thanx, Bertus, as I have not used the deck for a number of years that could be the reason, I think I will have to check all the mechanics while I'm at it, Cheers, Geoff. Second private message from the TS: Hi, thinking about it being the pressure...
  7. bertus

    Need a new multimeter - any thoughts

    Hello, @hevans1944 , The link in Ratstars post is auto inserted by the software and that does not always works perfect. In the Electronics Point (Old) style the links are not inserted. You can change the style in the preferences of your profile. For reference, I printed the page posted by...
  8. bertus

    Resonance

    Hello, Perhaps the following articles might interest you: http://www.vlf.it/minimal/minimal.htm http://www.vlf.it/easyloop/_easyloop.htm They are from a site specialized in lower as 22 kHz reception: http://www.vlf.it/ Bertus
  9. bertus

    Sensor required to sense if a human is wearing the helmet(for motorbike) or not

    Hello, What should the sensor do with this helmet? You will likely need a camera with a lot of calculation power for "seeing" the helmet. Bertus
  10. bertus

    Calculation of motor speed

    Hello, The doc files are just a bit to large to post. I think you mean this doc in that folder: AN1078 Demo ReadMe MCLV-2 with dsPIC33CK256MP506 Internal Op-Amp Motor Control PIM (MPLAB X).pdf What page do you have questions? You could print the page to a PDF and post it. Bertus
  11. bertus

    Calculation of motor speed

    Hello, @Harald Kapp , He mentioned AN1078 and not AN1987. Here is a link to AN1078: https://www.microchip.com/wwwAppNotes/AppNotes.aspx?appnote=en530042 Bertus
  12. bertus

    Tape speed

    Hello, I do not think that the belt has to do with the high speed. It could be that the pressure roller is not correctly moving to the capstan. https://www.researchgate.net/figure/Cassette-deck-1-PM-motor-2-capstan-3-belt-4-flywheel-5-pressure-roller_fig9_244989418 Bertus
  13. bertus

    And now something weird

    A boat on the road?
  14. bertus

    Resonance

    Hello, An other page for gyrator circuits can be found at ESP: https://sound-au.com/articles/gyrator-filters.htm Bertus
  15. bertus

    make this VU meter more sensitive, please

    Hello, One could mimmick the LM chips with the internal schematics, using a couple of LM324´s. Bertus
  16. bertus

    make this VU meter more sensitive, please

    Hello, If you are looking for some led vu meter schematic, just google: led vu meter schematic Many use the mentioned chips, but some use a diode array or a couple of LM324´s Bertus
  17. bertus

    make this VU meter more sensitive, please

    Hello, The LM3914 that @Harald Kapp mentioned has a linear scale. The LM3915 has a scale in 3 dB steps. The LM3916 has a scale like a VU meter. Bertus
  18. bertus

    make this VU meter more sensitive, please

    Hello, The μPA2003 is likely an ULN2003 darlington array. The resistors are choosen to have enough current to light a led through the ULN2003. Bertus
  19. bertus

    Some help please to identify a transistor

    Hello, That could be the one. On the transistors the 2S is often ommitted. Bertus
  20. bertus

    And now something weird

    The strong granma:
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