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  1. bertus

    Astable 555 500Khz 20ms

    Hello, The hysteric oscillator will be rather close to the 50% duty cycle: https://www.allaboutcircuits.com/textbook/experiments/chpt-8/555-hysteretic-oscillator/ Bertus
  2. bertus

    Coronavirus transmission prevention device.

    Hello, Here is a worldmap with the current corona infections: https://localfocus2.appspot.com/5e591af43f4a2 In the netherlands we now have 188 cases. Bertus
  3. bertus

    various resource sites

    Hello, Here I got an other linksite: http://code.rancidbacon.com/Electronics When a link does not work, you can always try to find an archived version on the internet archive in the wayback machine: https://archive.org/ Bertus
  4. bertus

    LM338 Voltage and Power Questions

    Hello, Keep in mind that the tab is connected to the output voltage when mounting it directly to the heatsink: Bertus
  5. bertus

    Trying to match an old terminal block

    Hello, That seems to be a barrier screw terminal: https://www.rapidonline.com/Barrier-Terminals The 9 inch terminal block is likely a cooper bussmann TB 400 series. The full connector catalog can be found here...
  6. bertus

    Can you solve this UJT Transistor Problem?

    Hello, This is the Homework Help forum. We will not give the solution, but try to guide you to the solution. What have you done upto now to solve the problems? Post them here and we will see how to continue. The following page will show you a bit more about the UJT...
  7. bertus

    I think I'm starting a collection

    Hello Steve, Here I found a page with a lot of information on "boatanchors" (old equipment) : http://www.virhistory.com/ham/rrab.faq.htm Bertus
  8. bertus

    Do you know the following linksites?

    Hello, Over the years I have found the following link sites: http://www.101science.com/eleclinks.htm https://circuitsarchive.org/ https://www.epanorama.net/ http://www.solorb.com/elect/ Bertus PS @(*steve*) , @Harald Kapp , @davenn , If there is a better place for the links , copy or move...
  9. bertus

    UltraSonic Transducer.

    Hello, The transducer you are showing looks like the one on this page: https://www.bjultrasonic.com/shop/28khz-100w-ultrasonic-cleaning-transducer-pzt4/ Bertus
  10. bertus

    UltraSonic Transducer.

    Hello, On the page of the transducer it is stated to be an 28 kHz version. For that you will need a driver like this: https://www.alibaba.com/product-detail/28KHz-ultrasonic-transducer-driver-PCB-Circuit_60777216941.html Unfortunately is is designed for 220 Volts operation. Bertus
  11. bertus

    Doubts battery operation and power of the Chinese plasma pen

    Hello, Does the pen work upto now? Sometimes it helps to run the battery empy and charge it full. It helped on our HP laptop that would not charge the battery anymore. Bertus
  12. bertus

    TVS Transient Voltage Suppressor

    Hello, Have a look here: https://www.littelfuse.com/products/tvs-diodes/leaded/1_5ke/1_5ke350.aspx It seems to be 350 Volts and a peak power of 1500 Watts. Bertus
  13. bertus

    Mix2052 audio chip

    Hello, The Mixinno datasheet of the chip is in chinese. I do not read chinese. I see the chip has a gain of about 20 dB. Bertus
  14. bertus

    Need help with a multiplexer

    Hello, Reading the datasheet, the powersupply may be single ended: Bertus
  15. bertus

    Need help with a multiplexer

    Hello, That should not be a problem. The datasheet shows these schematics: Perhaps the same can be done with the DG408. Bertus
  16. bertus

    Need help with a multiplexer

    Hello, What analog signal levels are you using? Perhaps the CD4051 might work for you. www.ti.com/lit/ds/symlink/cd4051b.pdf Bertus
  17. bertus

    LM386 Alternative (Simple but slightly more power?)

    Hello, Did you undertand my statement? The 100 uF will only give a little less basses. Bertus
  18. bertus

    LM386 Alternative (Simple but slightly more power?)

    Hello, When making an amplifier with the LM386, the 10 Ohms resistor and 0.05 uF on the output are a must: For the 0.05 uF capacitor an 47 nF capacitor can be used. Without the resistor and the capacitor on the output, the LM386 might oscillate and get hot. Bertus
  19. bertus

    LM386 Alternative (Simple but slightly more power?)

    Hello, If you want more power, have a look at the PAM8603 or PAM8610 module: http://www.diybudgetaudio.com/PAM8403.htm http://www.diybudgetaudio.com/PAM8610.htm More can be found here: http://www.diybudgetaudio.com/ Bertus
  20. bertus

    Missing resistor in a voltage divider network

    Hello, In Holland the LM3914 and 3916 are still available: https://www.bitsandparts.nl/LED-Display-drivers/IC-LM3914-Dot-Bar-display-driver-(LED-VU-meter)/p113680 https://www.bitsandparts.nl/LED-Display-drivers/IC-LM3916-Dot-Bar-display-driver-(LED-VU-meter)/p113681 In Amsterdam, they are all...
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