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  1. bertus

    240VDc supply

    Hello, Wich parts do you have? The wiki shows this: https://en.wikipedia.org/wiki/AN/ARC-5 Also a dutch radioamateur has a page: https://www.pa3esy.nl/military/us/air/ARC-5/html/arc5_set.html Google images shows a lot of schematics...
  2. bertus

    loudness question

    Hello, Here is an other article on power vs efficiency: https://sound-au.com/articles/pwr-vs-eff.htm Bertus
  3. bertus

    loudness question

    Hello, Power can be calculated with this rule: Power is not the only thing that matters in loudness. Also speaker efficiency comes in play: https://www.lifewire.com/amp-power-speaker-efficiency-3135077 Bertus
  4. bertus

    loudness question

    Hello, Did you see the conversation (PM) I started? (look at the envelope or the messages in the topbar) In there you will find some links. Bertus
  5. bertus

    What is a toggle switch?

    Toggle switch https://en.wikipedia.org/wiki/Switch#Toggle_switch
  6. bertus

    4 Position DC Switch (1 OFF and 3 ON Positions)

    Hello, Without the exact details of the switch it is not possible to give you a wiring diagram. There are many configurations of slide switches. Bertus
  7. bertus

    4 Position DC Switch (1 OFF and 3 ON Positions)

    Hello, Your switch is a look alike from this page: https://www.alibaba.com/product-detail/Mechanical-4-position-10-pin-slide_60665173897.html The stated current on that page is 0.3 Amp. Bertus
  8. bertus

    Can I replace a brown ceramic capacitor with blue ceramic?

    Hello, No, the code 560 stands for 56 pF and 561 stands for 560 pF. Have a look at this page for capacitor codes: https://www.electronics-notes.com/articles/electronic_components/capacitors/capacitor-codes-markings.php Bertus
  9. bertus

    What is this in nf? .1k it’s polyester capacitor

    Hello, The part is a capacitor with a value of 0.1 uF or 100 nF. The K stands for the tollerance of 10 %. Have a look at this page for reading capacitor codes: https://www.electronics-notes.com/articles/electronic_components/capacitors/capacitor-codes-markings.php Bertus
  10. bertus

    Antenna Repair & Replacement

    Hello, You could blast some contact cleaner in the potentiometer near the connections: This could remove dirt from the carbon track, when moved a couple of times all the way up and down. Bertus
  11. bertus

    Question: LED DISPLAY 7-SEG. RED SA40-19SURKWA

    Hello, Those are large displays with multiple leds in one segment. That is why the forward voltage is 7.4 Volts. The stated current is for each segment. If all segments are on there will be 7 X 10 mA drawn from the supply = 70 mA for each display. Also if the decimal point is used, extra...
  12. bertus

    Sb390 equivalent replacement

    Hello, Diodes with higher current and/or voltage ratings can be used. Bertus
  13. bertus

    Reset issue

    Hello, The output should go down to about 0.3 Volts: Bertus
  14. bertus

    And now something weird

    Tall women: https://archive.org/details/dailymotion-x6fwavp Bertus
  15. bertus

    Tek 7L13 repair

    Hello, As @Martaine2005 said, the user has not been online a long time. The profile states his last visit was on nov 6, 2009. Perhaps you can find info in the following manuals: 7L13_sm.pdf 7l13.pdf Bertus
  16. bertus

    cameras

    Hello, There seem to be several cameras for arduino. The following page shows you a kind of top 10: https://theunboxfactory.com/arduino-camera/ Bertus
  17. bertus

    Capacitor mF vs. uF confusion when replacing

    Hello, Some old manuals use the m for micro, wich can be confusing, as nowerdays µ (mu sign) is used. Bertus
  18. bertus

    Working on a 3-voice 40106 oscillator. Need help...

    Hello, The diode is probably there to avoid current going back into the left oscillator. You might also be interested in the following page: https://www.allaboutcircuits.com/technical-articles/how-to-design-schmitt-trigger-oscillators/ Bertus
  19. bertus

    Can oscilloscopes measure circuits with different voltages at the same time?

    Hello, Again not true. A voltage doubler will double the voltage, but half the current. Show a circuit of your voltage doubler. Bertus
  20. bertus

    Working on a 3-voice 40106 oscillator. Need help...

    Hello, You might be interested in the following book from the MAKE series: https://archive.org/details/make-analog-synthesizers/mode/2up Bertus
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