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  1. bertus

    Suggestions for winter electronics projects wanted

    Hello, Here are a couple of pages with transistor organs: https://www.electroschematics.com/electronic-organ-circuit/ https://www.aaroncake.net/circuits/torgan.asp https://www.circuits-diy.com/electronic-organ-circuit-using-transistors/ Bertus
  2. bertus

    Green Technology

    Hello, Perhaps some links from the following pages might help: Biodiesel Biomass energy DIY Pedal Energy DIY solar energy DIY water turbine DIY wind turbine Energy Energy production Geothermal energy Hydro energy Hydropower Renewable energy Nuclear power plants Solar cells Solar cell animations...
  3. bertus

    Experiment 9; MAKE: Electronics (2nd ed.)

    Hello, I have moved your question to its own thread, as the origenal thread is 10 years old: https://maker.pro/forums/threads/experiment-9-make-electronics.244219/ https://archive.org/details/make-electronics-2nd-ed. Here is the picture from the make book: There is a voltage drop accross...
  4. bertus

    A stable vibrator circuit 12 volt dc supply

    Hello, Have a look at this page: https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_6 It shows a circuit in figure 3 that us usable upto 20 Volts. Bertus
  5. bertus

    Capacitance rules...

    Hello, Have a look at the following page: https://www.apogeeweb.net/electron/capacitors-in-series-and-parallel.html#:~:text=When%20the%20capacitors%20are%20connected%20in%20series%2C%20the,damage%20the%20capacitor%20due%20to%20uneven%20voltage%20distribution. Bertus
  6. bertus

    Multiple ttp223 on same power supply

    Hello, You can not drive the ledstrip directly from the TTP223 module. The module can only drive 8 mA. The ledstrip will likely need much more current. You will need a driver between the TTP223 module and the ledstrip. Bertus
  7. bertus

    Beginnings

    Hello, Perhaps the following books might interest you: https://archive.org/details/teach-yourself-electricity-and-electronics-4th-ed. https://archive.org/details/basic-electronics-theory-and-practice-2nd-ed. Bertus
  8. bertus

    Max7219 is making a lot of noise

    Hello, Do you have decoupling capacitors on the power lines near each chip? Read this thread on All About Circuits for more info: https://forum.allaboutcircuits.com/threads/decoupling-or-bypass-capacitors-why.45583/ Bertus
  9. bertus

    Max7219 is making a lot of noise

    Hello, Can you post a schematic? Bertus
  10. bertus

    How to connect a 5v micro vacuum pump to a Raspberry Pi 4 computer model B

    Hello, as @kellys_eye , there are free downloadable magazines and books for Raspberry Pi. I made a link for MAGPI in the resources: https://maker.pro/forums/resources/raspberry-pi-books-and-magazines.76/ Bertus
  11. bertus

    Forum Upgrade & Merging with Maker.pro

    Hello, I again got an other mail from Maker.pro, I never asked for, even when I did UNSUBSCIBED. I did not aks for mails from maker.pro. I UNSUBSCIBED AGAIN. There should be an OPT-IN in stead of an OPT-OUT. Bertus
  12. bertus

    Need help wiring stereo jack to disconnect speaker

    Hello, The jack you have can not disconnect both channels. It only has a disconnect on the tip. You need this one to disconnect both channels: https://www.digikey.com/en/products/detail/cui-devices/SJ-3505/96990 Bertus
  13. bertus

    Old transistor stereo problem

    Hello, When the yellow modules are defective, you are probably out of luck. They are custom made and carry in-house numbers that can not be found online. You could try to find a service manual and see the functions of the modules. Bertus
  14. bertus

    I have no idea, please help. Identifying a component and how to fix.

    Hello, Here is a little google image search that @Martaine2005 recommended...
  15. bertus

    Book Reviews

    Hello, @Erstwhile , @Martaine2005 You can also have a look at the complete collection of books here: Folkscanomy Electronics: Books on Electronics, Circuits and Processors Bertus
  16. bertus

    Forum Upgrade & Merging with Maker.pro

    Hello, I noticed that on the bottom of the page in the "maker pro retro" style, there are some statistics shown: You can switch from style in your profile, in the section preferences. Bertus
  17. bertus

    Identify SMD component

    Hello, It could be an 1SR154-400 diode: https://smd.yooneed.one/code3134.html https://nl.rs-online.com/web/p/schottky-diodes-rectifiers/7002808 Bertus
  18. bertus

    24VDC LED on 24VAC power source. Amateur questions.

    Hello, Diodes of the type 1N4001 to 1N4007 will do the trick. Those can handle currents upto 1 Amp. Bertus
  19. bertus

    24VDC LED on 24VAC power source. Amateur questions.

    Hello, When you take 0.4 meter if the strip it will take 11.52 X 0.4 = 4.6 watts. The max current will be 4.6 Watts / 24 Volts = 0.192 A As the strip seems to have current limiting build in, you could reduce the voltage by putting some diodes in series in stead of a resistor. Bertus
  20. bertus

    24VDC LED on 24VAC power source. Amateur questions.

    Hello, Do you have a datasheet of the used led? That way we can see what is needed. Bertus
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