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  1. bertus

    Help To Determine Resistor To Dim Incandescent Light Bulbs

    Hello, A good way to dim lamps is PWM. Have a look at this thead on All About Circuits: https://forum.allaboutcircuits.com/threads/project-simple-pwm-circuit.9016/ Bertus
  2. bertus

    Elliot Sound products, for all you audio questions

    Hello, On the website of Elliot Sound Products you will find all sorts of information on audio topics: https://sound-au.com/ Bertus
  3. bertus

    Elliot Sound products, for all you audio questions

    bertus submitted a new resource: Elliot Sound products, for all you audio questions - Audio Education Read more about this resource...
  4. bertus

    Issues with connecting an electret microphone to a recorder's phantom power.

    Hello, Have a look at the following page: https://sound-au.com/articles/mic-electret.htm It will tell you how to power your electret microphone. Bertus
  5. bertus

    Comedy Thread

  6. bertus

    Rs232 help

    Hello, Thanks for posting a link to the manual. Read section 2.3.3 for the RS 232 cable connection. Read section 3.6 for the settings of the RS 232 communication. Read section 3.7 for understanding what the RS 232 is sending. Bertus
  7. bertus

    GCSE homework

    Hello, The question is pure theoretical. A transistor will never be saturated with the given base current of 4.5 mA. In practice we use Ib =Ic/10 for saturation of a switching transistor. In your example the transistor should have a gain of 3.6 / 0.0045 = 800 times. Can you show your...
  8. bertus

    Just need a "simple" question answered around something I'm designing it's mechanical in nature but confident there are people who may be able to help

    Hello, You might find some info on the following site : https://www.engineeringtoolbox.com/ Bertus
  9. bertus

    Can I put a 3 watt speaker to a 5 watt board

    Hello, You can not play at full volume. If you do, the speaker will blow. Take a speaker of at least 5 Watts. Bertus
  10. bertus

    YAMAHA RX-V650 does not turn on

    Hello, Here you can download the manuals: https://elektrotanya.com/yamaha_rx-v750_dsp-ax750_ax750se_rx-v650-htr-5760.pdf/download.html Bertus
  11. bertus

    Transistor replacement

    Hello, Could you do some "reverse engenering" on the board? Post some pictures of the board to see if it is possible to adapt the board to more modern parts. Bertus
  12. bertus

    Rs232 help

    Hello, L1, L2 and L3 are not placed and will isolate the CN4 connection. Does the manual say anything about the RS232 connection, like speed and bits. Bertus
  13. bertus

    Transistor replacement

    Hello, The transistor you got has japanese coding. It is a PNP AF transistor. See the attached files for more info. The pdf page comes from this book: https://archive.org/details/Towers-TowersInternationalTransistorSelector Bertus
  14. bertus

    Where to start/post project to do with my grandson

    Hello, Rapidonline has a series of snap circuits, that will allow some learning: https://www.rapidonline.com/Catalogue/Search?Query=Snap%20circuits&Size=20&Attributes={%22Brand%22:[%22Snap%20Circuits%22]} Bertus
  15. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, When you place the parts in the same way as the other filters, it would be as easy as making a copy. The only difference will be component values. The coloured wires should look the same for every filter. Bertus
  16. bertus

    Where to start/post project to do with my grandson

    Hello, Where are you from? There are kits that allow experimenting with the parts you mention. With your location , I might give you some info on the kits available in your region Bertus
  17. bertus

    I need a 350V, 1A PSU

    hello, have a look at this page for an idea: https://sound-au.com/project151.htm bertus
  18. bertus

    Kb-3150

    Hello, Please use only english on this site. Translation by google: Help to find the pcb data sheet of Kb-3150 Bertus
  19. bertus

    Comedy Thread

  20. bertus

    Comedy Thread

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