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  1. bertus

    9 LED UV disco light - remote control issue

    Hello, The remote seems to use IR. See this picture taken from Amazon: Bertus
  2. bertus

    Does anyone know what this is?

    Hello, It could be an 2W 10 Ohms NTC: https://eu.mouser.com/ProductDetail/YAGEO/N08SP010M?qs=sGAEpiMZZMv0NwlthflBi6by6xJJbVjZV2%2F%252BzdfRo1E%3D Bertus
  3. bertus

    Samsung LE40B530P7W - NO POWER - BN44-00264C Rev 1.4 fault find

    Hello, The service manual seems to be able to download here: https://elektrotanya.com/samsung_le32b530p7wxxc_le32b530p7wxxc_le40b530p7wxxc_le46b530p7wxxc_chassis_n65a.pdf/download.html Section 4 shows the trouble shooting. Looking at the pictures, the black spot is likely made by the blue...
  4. bertus

    Reduce amperage without reducing voltage. Question. Help.

    Hello, Yes, as long as the plug is correct and has the correct polarity, there is no problem. Bertus
  5. bertus

    Samsung LE40B530P7W - NO POWER - BN44-00264C Rev 1.4 fault find

    Hello, Can you post a close-up of that area? Also a picture of the back of that area would help. Bertus
  6. bertus

    How do you get homework help when you reach master's level of very higher level of education?

    Hello, Perhaps there is some help in the books on the Internet Archive: https://archive.org/details/folkscanomy_computer?query=big+data Bertus
  7. bertus

    Help with work to finish my college. Help me please!

    Hello, What would you learn from copying a circuit? Have a look at your Q7. Bertus
  8. bertus

    Help with work to finish my college. Help me please!

    Hello, It does not look like a Class D amplifier. Where is the oscillator and comperator for the PWM signal? I see two current sources in your schematic. They are build around Q3, Q4 and Q5,Q6. The configurations seem to be incorrect...
  9. bertus

    Comedy Thread

    Thanks to Dick Cappels AAC
  10. bertus

    Strange battery behaviour in portable radio?

    Hello, Can you use a USB power bank? There are some quite powerfull ones around. Bertus
  11. bertus

    Strange battery behaviour in portable radio?

    Hello, According to the specs, it also seems to be able to run on a 5V 500mA adapter (USB powered): http://www.cryptoelectronics.com/products/digital-tv/digital-radio/crypto-dab-radio-redi-db100-dab-fm-portable-radio-black.html Bertus
  12. bertus

    Basic voltage divider question

    Hello, The output range will be smaller as the +/- 5 volts range as the potmeter will be a load for the voltage dividers. I would use a circuit like this: The opamp will make a buffer to the synth. The opamp can be powered from the +/- 10 Volts. Bertus
  13. bertus

    Strange battery behaviour in portable radio?

    Hello, It sound like bad batteries. The 0.5 Volts batteries are likely to have a high internal resistance. What happens when you run the crypto on new fresh batteries? Bertus
  14. bertus

    Connecting multiple piezo ceramic elements in a sound installation

    Hello, The piezo speakers can have very narrow frequency range. Only the frequencies given (27mm 4.0KHz ±0.3KHz and 35mm 2.6KHz ±0.3KHz) will be reproduced. If you seller can give you a spectrum like in the link, you can tell more about the reproduction of the sound...
  15. bertus

    Crossing 90's IC caps

    Hello, The links do not work. Resize the pictures to about 300 kB and post them here. Bertus
  16. bertus

    Help with Realistic speaker with built in amp

    Hello, I do not like to watch external pictures. Resize them to about 300 kB and post them over here. Bertus
  17. bertus

    Help with Realistic speaker with built in amp

    Hello, What is the type number of the powered speaker? Jabse has a large page with realistic info: https://www.jabse.com/Ly4gUmFyZSBhbmQgQW5jaWVudCBFcXVpcG1lbnQvUmVhbGlzdGlj Bertus
  18. bertus

    EveryCircuit - How to add a missing component ?

    Hello, Did you see this on their webpage: mailto:[email protected]?subject=EveryCircuit%20inquiry It is hidden in the support button. Bertus
  19. bertus

    Advice on oscilloscope

    Hello, You might want to have a look at this thread at All About Circuits: https://forum.allaboutcircuits.com/threads/budget-oscilloscope-for-home-lab.174336/ Take a good look on what user Tautech has to say. Bertus
  20. bertus

    4 Wire Short

    Hello, You could see it as an 0 Ohm reference for 4 wire resistance measurements. Bertus
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