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  1. bertus

    Part identification help?

    hello, the part looks like a backup battery. the size will be determent for replacement. the wiki has a page about battery sizes. yours is a button battery: https://en.wikipedia.org/wiki/List_of_battery_sizes bertus
  2. bertus

    Ssr circuit to control fridge compressor

    Hello, There are some precautions you can take. See the attached PDF for more info. Bertus
  3. bertus

    Burnt resistor’s value for MAS830L multimeter

    Hello, Again are they on the 10 A connections? The combination of resistors should be 0.01 Ohms (R11 in the schematic). The 0.15 Ohms could be a correction on the total. A possible combination could be 0.011 with 0.11 Ohms. 0.011 and 0.11 are standard values in the E24 range: The lowest...
  4. bertus

    Burnt resistor’s value for MAS830L multimeter

    Hello, The combined value of R10 should be 0.99 Ohms. Is the 0.15 connected to the 10 A connections? Bertus
  5. bertus

    Burnt resistor’s value for MAS830L multimeter

    Hello, Tou can download a schemaic from here: https://radio-hobby.org/modules/news/article.php?storyid=224 Bertus
  6. bertus

    doubt cooler tvbox

    Hello, When it vents to the bottom, place some higher feet under the box to have a more free outlet of the air. The fan of the box should be enough. An usb cooler might even have a negative effect as it will likely blow against the box, giving resistance to the air coming out of the box. Bertus
  7. bertus

    device storage with electrolytic capacitor

    Hello, How many capacitor and battery questions can we expect from you? I many times gave you links to the CapSite and the BatteryUiniversity: http://www.iequalscdvdt.com/ https://batteryuniversity.com/ The owner of this site also made the Capacitor Guide at our partner website EEPower...
  8. bertus

    Do you know this site "There is an AI for that" ?

    Hello, Here is the site: https://theresanaiforthat.com/ Bertus
  9. bertus

    doubt joystick battery

    Hello, Read this page: https://batteryuniversity.com/article/bu-106a-choices-of-primary-batteries Bertus
  10. bertus

    I need some help with making a pcb

    Hello, Here is an other page with some tips for toner transfer: https://hackaday.com/2016/09/12/take-your-pcbs-from-good-to-great-toner-transfer/ Bertus
  11. bertus

    I need some help with making a pcb

    Hello, No, an inkjet uses ink. A laser printer uses toner. Bertus
  12. bertus

    I need some help with making a pcb

    Hello, As it sais, Toner Transfer. A laser printer is used and the toner is transfered to the PCB, using heat, like an iron at low temparature (just hot enough to melt the toner on the PCB. Some even use a modified laminator for the toner transfer. Bertus
  13. bertus

    I need some help with making a pcb

    Hello, @Maglatron an other way of making PCB's is using Toner Transfer: https://www.bestsoldering.com/pcb-toner-transfer-method/ Bertus
  14. bertus

    Spectrum analyser Equalizer project how to go about it?

    Hello, There must be a failure in your frequency list. You jump from 1199 to 16000. What happens to the frequencies in between? Bertus
  15. bertus

    Repair RF amplifier board

    Hello, The backside of the transistors is connected to the source of the transistors. See the first page of the datasheet for more info. Bertus
  16. bertus

    Spectrum analyser Equalizer project how to go about it?

    Hello, Some members are using Kicad for drawing schematics and PCB's. https://www.kicad.org/ In the resources there are also some tutorials. https://maker.pro/forums/resources/kicad-tutoriol-source.78/ Bertus
  17. bertus

    Repair RF amplifier board

    Hello, I was wrong with the statement that the transistors are the same. The AN and BN versions are mirrored: Also the 2.7 Volts can be seen in the graph in the datasheet: Bertus
  18. bertus

    Repair RF amplifier board

    Hello, On the board is written "2.7 volts or 300 mA" for the bias. The 5 Volts from the regulator are more than enough. Bertus
  19. bertus

    Repair RF amplifier board

    Hello, In the RF amplifier they put the transistors in linear mode. The page tells you that it happens at a gate voltage of about 2.7 Volts. Bertus
  20. bertus

    Repair RF amplifier board

    Hello, Did you read this on that page: The idle current for the MRF300 LDMOS transistors is set at 300mA each, with a bias gate voltage of around 2.7V. To achieve this value, a LM317HV high voltage linear regulator takes the supply voltage and adjusts it down to a value around 8-10V, which is...
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