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  1. bertus

    Bringing an old Stargate console to life - after cleaning

    Hello, For places you can not reach with a brush, as @Martaine2005 mentioned, you could use dust-off. https://www.amazon.com/Dust-Off-DPSM2-Disposable-Duster-oz/dp/B009FFVOLK?th=1 Bertus
  2. bertus

    Why Do DC Inverters Damage Items?

    Hello, Do you have details on the used inverter? It sound like the output voltage is varying with the change of input voltage. The regulation of the output voltage seems not to work well. What is the input voltage range of the new inverter? Bertus
  3. bertus

    I want to design a single led to be powered by 4 garden-sized solar cells

    Hello, Perhaps a dedicated chip will do the trick: https://ez.analog.com/adieducation/university-program/b/blogs/posts/hacking-an-led-solar-garden-light More schematics here...
  4. bertus

    schematic wanted for Pevey XR800F Plus

    Hello, Here you can find the schematics: https://www.audioservicemanuals.com/p/peavey/peavey-xr/1335570-peavey-xr-696-xr800f-power-amp-schematics More xr schematics can be found here: https://www.audioservicemanuals.com/p/peavey/peavey-xr/ Bertus
  5. bertus

    Transformer wrapping

    Hello, The EDUCYPEDIA has also a couple of pages with links: Transformers Transformer types Bertus
  6. bertus

    110v strobe flasher circuit help

    Hello, What kind of lamp are you trying to flash? That way we can search for a compliant schematic. On 110 Volts, xenon strobes are often used...
  7. bertus

    NE555 reset pin using transistor

    Hello, Looking at the datasheet, the sensor latches until reverse magnetic field is given. Bertus
  8. bertus

    'Letraset' type dry transfers for PCB pads chemical etch resist

    Hello, You could also draw your PCB's using Kicad. It is free and available for windows, apple and linux: https://www.kicad.org/ Minder posted a resource with a lot of tutorials for KiCad: Kicad Tutoriol Source. Bert
  9. bertus

    NE555 reset pin using transistor

    Hello, How do you trigger the sensor? Is the magnet strong and close enough? Do you see the led change when the magnet is close to the sensor in my schematic? Bertus
  10. bertus

    120Hz hum in Polk Audio PSW202 or Rm6750 subwoofer

    Hello, An option would be a master-slave extention cord: https://commons.wikimedia.org/wiki/File:Master-Slave-Steckdose.jpg I am using one for my computer, to switch the boxes and monitor. Bertus
  11. bertus

    'Letraset' type dry transfers for PCB pads chemical etch resist

    Hello, In the old days we used sharpy's for hand made PCB's : http://www.stefanv.com/electronics/etching.htm An other method is laser printer paper transfer: https://www.giangrandi.org/electronics/pcb/pcb.shtml Bertus
  12. bertus

    NE555 reset pin using transistor

    Hello, I would try this on the rest pin of the 555: Bertus
  13. bertus

    NE555 reset pin using transistor

    Hello, Which values did you use for the pull-up resistors? A resistor of 1 K @ 5 Volts should work: Bertus
  14. bertus

    Boom box/walkman cassette spinner not roataing

    Hello, It looks like the back of the casette player has some screws. As @PETERDECO said, have a look inside. Have a look at the pictures of this thread on stereo2go: http://stereo2go.com/forums/threads/panasonic-national-rx-f-80-very-rare-mini-boomer-minty.1071/ Bertus
  15. bertus

    AC signal to antenna

    Hello, How would you test your setup? Transmitting RF using an antenna can void rules. There are strickt rules for using RF. Bertus
  16. bertus

    VCO modulating voltage input

    Hello, I would expect the voltage be the half of the range, so about 2.25 Volts. Bertus
  17. bertus

    AC signal to antenna

    Hello, What is your intention with the RF signal? In your other thread you do mention a 1.2 GHz VCO. Bertus
  18. bertus

    VCO modulating voltage input

    Hello, Where did you get the VCO module? What is the frequency range? The modulation input is likely to shift the frequency of the module, like FM modulation. Bertus
  19. bertus

    VCO modulating voltage input

    Hello, Do you have a datasheet or other detailed info on the module? I would take two resistors to make a voltage divider, to fix the modulation input on a fixed value, inside the range of the mentioned 0-4.5 Volts. Bertus
  20. bertus

    How to make composite video black and white?

    Hello, On HDMI it will be rather difficult as HDMI is digital. VGA is analog and would be more easy to change. Would this page help: https://www.geocities.ws/podernixie/htpc/cables-en.html Bertus
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