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  1. bertus

    Is it necessary to power on in order to diagnose failure IC of CRT TV?

    Hello, If you want to know more about repairing stuff, have a look at the following resources: https://maker.pro/forums/resources/troubleshooting-and-repair-info-pages.68/ https://maker.pro/forums/resources/service-manuals-and-schematics.69/ Bertus
  2. bertus

    Question about DC current flow

    hello, ac and specily rf currents display the skin effect: https://en.m.wikipedia.org/wiki/Skin_effect bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, have a look at post #625 where i changed the capacitor value. bertus
  4. bertus

    Sallen Key Low Pass Filter, bandpass filter

    hello, the value of that resistor could be lowered when we adapted (raised) the values of the coupling capacitors. bertus
  5. bertus

    Motor or solenoid

    hello, this is an 13 years old thread. time to close. bertus
  6. bertus

    Simple Hall sensor alarm circuit?

    hello, the sensor seems to be a hall effect sensor with an open collector output: https://datasheetspdf.com/pdf/948706/AllegroMicroSystems/3144/1 an open collector output needs a pull- up resistor to work. bertus
  7. bertus

    Simple Hall sensor alarm circuit?

    hello, there is no doc or datasheet. please post the picture. without the picture we can give no advice. bertus
  8. bertus

    Best Ham Radio Transceivers (base station and mobile) for Long Range Communication in case of Disaster by Nature or Human.

    Hello, Have a look at this wiki page for the licences in america: https://en.m.wikipedia.org/wiki/Amateur_radio_licensing_in_the_United_States Bertus
  9. bertus

    24v to 12v converter

    Hello, The given page does not give the input voltage range. We can not say if it works with an input voltage of 18 Volts. Bertus
  10. bertus

    Need Help Identifying an 8-bit Microcontroller with RF Transmitter for Drone Project

    hello, i see a very short antenna at the edge of the board. the chip next to it is probably a kind of synthesizer chip for rf. i also see a crystal at the other side of the chip. the type marking has been wiped off to protect the copyright. bertus
  11. bertus

    I grow tomatoes really well, now I'm trying my hand at automating the entire process

    hello, diodes are used on DC solenoids. on AC a RC snubber network is used. bertus
  12. bertus

    Foxconn JA23332-810

    Hello, Good you found the datasheet. Could you post the datasheet here for later reference? Bertus
  13. bertus

    NPN and PNP to gate of N-channel

    Hello, Your scribble is very hard to understand. Please use the correct schematic symbols, in stead of the blocks. In this picture you will find a lot of symbols that you can copy and paste in to a drawing program: Bertus
  14. bertus

    3v step down from 12v

    Hello, The flame leds you are showing do not need a resistor. There seem to be a current regulator on the board of about 20 mA. On an 3 Amp down converter you can use upto 100 of you leds and still have some headroom. Bertus
  15. bertus

    3v step down from 12v

    hello, yes, that would likely work. this is stated on the page: 5pcs Mini DC-DC 12-24V To 5V 3A Step Down Power Supply Module Voltage Buck Converter Adjustable 97.5% 1.8V 2.5V 3.3V 5V 9V 12V the leds you have seen to work between 3 and 5 volts as the leds only take 20 ma, you can activate a...
  16. bertus

    help with IR2110 chips

    Hello, This example uses air coils: https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/iet-rpg.2018.5311 Bertus
  17. bertus

    Comedy Thread

    https://ogpuns.com/pun/electronics/
  18. bertus

    Comedy Thread

    https://www.askideas.com/23-most-funny-electronic-photos/
  19. bertus

    arduino and raspberry pi books on the internet archive

    Hello, Here is an other link: https://archive.org/details/arduino-and-raspberry-pi-book-collection/Arduino%20And%20Kinect%20Projects/ Bertus
  20. bertus

    Fried PSU for 12v cb radio base station conversion

    Hello, I often use the KBPC bridge rectifiers. I have attached the 25 and 50 Amp datasheets. I have also attached the datasheet of your diode. Here is also info on the TO-3 powertransistor pinout: Bertus
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