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  1. bertus

    How do I make an opamp stereo mixer?

    Hello, Do the same for pin 5 for the second channel. Also add the mentioned capacitors on the second channel. Bertus
  2. bertus

    How do I make an opamp stereo mixer?

    Hello, Did you see the basic mixer schematic? It will need a dual powersupply. You can use two 9 Volts batteries. Bertus
  3. bertus

    How do I make an opamp stereo mixer?

    Hello, Have a look at the following projects: https://sound-au.com/project94.htm https://sound-au.com/project94a.htm Bertus
  4. bertus

    Switched Mode Power Supply problem

    Hello, Perhaps this page might give you some hints: http://www.repairfaq.org/sam/smpsfaq.htm As it is line powered, have a look at the safety guidelines: http://www.repairfaq.org/sam/safety.htm Bertus
  5. bertus

    Help rebuilding High School project

    Hello, @Martaine2005 , I once made a video signal generator using 30 TTL chips. It created a Pal compatible signal from an 4 MHz crystal. This blog I found shows the timing: https://blog.daum.net/trts1004/12109392 How difficult a simple dice circuit would be. Bertus
  6. bertus

    Why Raise Capacitance in Smoothing Caps?

    Hello, Have a look at this picture: More info in the attached PDF. Bertus
  7. bertus

    "Expensive" keyboard repair - ROCCAT Ryos

    Hello, Did you install any other drivers that could conflict with the driver of the keyboard? Bertus
  8. bertus

    "Expensive" keyboard repair - ROCCAT Ryos

    Hello, Did you look at the FAQ page? https://support.roccat.com/s/article/ryos-mk-pro-faqs?language=en_US Bertus
  9. bertus

    "Expensive" keyboard repair - ROCCAT Ryos

    Hello, I see you also posted on AAC: https://forum.allaboutcircuits.com/threads/expensive-keyboard-repair-roccat-ryos.187306/ Without more details, we can not be of assistance. Bertus
  10. bertus

    "Expensive" keyboard repair - ROCCAT Ryos

    Hello, From the mocrosoft page: Wich type if keyboard do you have? You can download drivers here: https://support.roccat.com/s/downloads?language=en_US Bertus
  11. bertus

    Boosting the Amper and altering the frequency

    Hello, What is the supply voltage for the BD135? At 29 Volts, the current with the 100 Ohms resistor will be 29 Volts / 100 Ohms = 0.29 Amp. The power in the resistor will be 0.29 Amp X 29 Volts = 8.41 Watts. The calculations can be done with this wheel: Bertus
  12. bertus

    Electrets don't work

    Hello, I have taken the schematic from the 2014 version of the book: Have a look on these pages from ESP on how to use electret mocrophones: https://sound-au.com/articles/mic-electret.htm https://sound-au.com/project93.htm Bertus
  13. bertus

    what mosfet to use for an induction heater

    Hello, Here is an overview from Rohm on IGBT's . Bertus
  14. bertus

    Potential energy of suspended mass expressed in kWh

    Hello, Here are the SI defenitions, from the posted PDF: Bertus
  15. bertus

    what mosfet to use for an induction heater

    Hello, Have a look at the attached Zip-file with an overview of the IRF mosfets. Bertus
  16. bertus

    capacitor replacement help

    Hello, Perhaps this page of ESP will help you: https://sound-au.com/articles/crossover-tables.htm There are several cross-over schematics and compensation networks. It will give you an idea how the filters are designed. Bertus
  17. bertus

    Potential energy of suspended mass expressed in kWh

    Hello, Common use for hour is h. From the posted PDF: Bertus
  18. bertus

    Potential energy of suspended mass expressed in kWh

    Hello, BTW, the prefix is a small k for kilo or 1000. In the attached PDF you will find more info on the SI-system. The complete document can be found here: https://usma.org/wp-content/uploads/2015/06/Practical_Guide_to_the_SI.pdf Bertus
  19. bertus

    Boosting the Amper and altering the frequency

    Hello, The gain of the 2N2222 is a bit less as the BC107. The collector current of the 2N2222 is much higher as the BC107. It would likely be no problem to use the 2N2222. I have attached a zip-file with a transistor table with some basic parameters. Bertus
  20. bertus

    How can I fix an unformattable raw micro SD card?

    Hello, Have you used an other reader/writer for the card? Have you tried an other operating system? With Knoppix, you can try to access the card in linux. http://knoppix.net/ It is a "live" distribution that will boot-up from a DVD. An other bootable CD is Hiren's boot CD. It is windows based...
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