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  1. bertus

    Stage Line 500W amp repair project

    Hello, That is a 20 MHz analog scope. That would also do fine for audio work. It has 2 channels, so you can also compare signals. I have an old Tektronix 454 scope. Bertus
  2. bertus

    Stage Line 500W amp repair project

    Hello, When you buy the nano scope, have a look at these videos: Bertus
  3. bertus

    Privacy lost

    Hello, What do social media know:
  4. bertus

    Power supplies not working on Sony ICF-SW7600G

    Hello, When the radio does not work on the battery, the battery holder or the switch in the DC connector can be a problem. The switch can be checked when no battery is in the radio and measure the contacts with an ohm meter. When there is no plug in the connector, the switch should be closed...
  5. bertus

    Replace IC 4049

    Hello, @Frankchie , That is why I mentioned the decoupling capacitors in post #21. Bertus
  6. bertus

    Stage Line 500W amp repair project

    Hello, They are comparable, but the second one has some more auto calculations in it. Bertus
  7. bertus

    Replace IC 4049

    Hello, The PDF in post #18 shows the driving specs of several chips. Bertus
  8. bertus

    Stage Line 500W amp repair project

    Hello, I was originaly looking for the nano scope, but that has a much higher price: https://www.amazon.co.uk/Seeedstudio-109990013-DSO-Nano-v3/dp/B078YJYJDR Bertus
  9. bertus

    Fuse details

    Hello, @Harald Kapp , Is not the value 0.15 Ohms, as the R is in front of the numbers? Bertus
  10. bertus

    Stage Line 500W amp repair project

    Hello, When you do only audio work, you can have a signal generator and scope for about 100 pounds: https://www.amazon.co.uk/Topiky-Function-Generator-Portable-FG-100-default/dp/B083TGVZ3Y https://www.amazon.co.uk/Digital-Oscilloscope-ETEPON-Source-15001K/dp/B07FPDY3DK Bertus
  11. bertus

    Comedy Thread

    Two balls in one hit:
  12. bertus

    Padstack footprint

    Hello, Does this page help? https://eepower.com/resistor-guide/resistor-standards-and-codes/resistor-sizes-and-packages/# Bertus
  13. bertus

    Eico 324 inductors

    Hello, Have a look at this page: http://www.peeblesoriginals.com/catalog/15.php The number of plates determines the capacitance. Bertus
  14. bertus

    Eico 324 inductors

    Hello, I have found these at JABSE. eico_model_324_rf_signal_generator.pdf eico_model_324_rf_signal_generator_1954.pdf eico_model_324_rf_signal_generator_construction.pdf Bertus
  15. bertus

    Diy generator

    Hello, There are many youtube videos on the subject. Here is one of them: How much power you can make on a bike is shown in this video: Bertus
  16. bertus

    Replace IC 4049

    Hello, The 4027 will NOT divide the voltage , it will divide the frequency. The outouts will have the same amplitude as the powersupply. When used as a divider the outpouts will alternate at half the frequency. Bertus
  17. bertus

    Replace IC 4049

    Hello, Decoupling capacitors ate there to have a stable working of oscillarors and logic circuits. The 555 will need a 10 uF and a 0.1 uF accross the power lines. Also you need the capacitors on the 12 volts regulator to avoid oscillations from the regulator: Bertus
  18. bertus

    Replace IC 4049

    Hello, You could also use IRL540 mosfets. Those are logic gate mosfets that are fully open at 5 Volt on the gate. Bertus
  19. bertus

    Replace IC 4049

    Hello, Are there enough decoupling capacitors used? Decoupling or Bypass Capacitors, Why? Bertus
  20. bertus

    Replace IC 4049

    Hello, What is the number on the used 4049? An 74HC4049 or 74HCT4049 can not be used as those are designed for low voltage. A HEF4049 or CD4049 should be used. The attached PDF will tell you about the levels in the various digital chips. Bertus
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