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  1. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The part in red is the opamp. Bertus
  2. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The second part , the LT6023 is a dual opamp. Search for the datasheet for more info. Bertus
  3. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, The shown part is a MUX. It works like a signal selector. Bertus
  4. bertus

    Reverse Photoresistor for volume control when nearing

    Hello, I created this new thread from a necropost and hyjack. This is a link to the origenal thread: https://maker.pro/forums/threads/reverse-photoresistor.283441/ Bertus
  5. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Here are some screenshots as example for the 32 Hz filter: Bertus
  6. bertus

    7486 IC problem

    Hello, Also The 7486 needs a powersupply voltage of 5 Volts. Your 9 Volts battery will likely fry the 7486. Bertus
  7. bertus

    Clear tunes model:62 adapter selectable dc voltage

    Hello, It looks like the unit is designed for 120 Volts / 60 Hz. The unit is an unregulated circuit as there is no chip for regulation. There is only a rectifier and a capacitor shown. The output voltage will vary dependend on the load current. The second switch looks like a polarity switch to...
  8. bertus

    Brushless motor controller

    Hello, The circuit in post #12 will not work with 220 Volts. The gate voltage will be to high and burn the gate and distroy the "driver". As you said the chips will be gone. Use proper driver chips as in your earlier posts. Bertus
  9. bertus

    Sallen Key Low Pass Filter, bandpass filter

    Hello, Have a look at the attached PDF's for filter design. Bertus
  10. bertus

    Digital Energy Meter Repairs

    hello, as said, what is the voltage on the battery? it seems to be a lithium battery of 3.6 volts. on the side of the battery there seems to be more info. bertus
  11. bertus

    With a Little Help from my friends?

    Hello Sparky, Theremin world has a lot of schematics for a theremin: http://www.thereminworld.com/schematics I have also attached a PDF with a complete description on how to build a theremin. Bertus
  12. bertus

    Computer PSU Repair

    Hello, What is the name of the control chip? On this page there are schematics of several ATX powersupplies, sorted by the control chip: https://danyk.cz/s_atx_en.html Bertus
  13. bertus

    Doubts joystick wireless AA battery dongle 2.4ghz

    Hello, The dongle could be a bluetooth dongle. A bluetoogh dongle most times can handle more channels at the time. How many "doubt" threads can we expect from you? Bertus
  14. bertus

    Scratching My Head w/ Crown CDi 4000

    Hello, You might find some tips in the links of this resource: https://maker.pro/forums/resources/troubleshooting-and-repair-info-pages.68/ Bertus
  15. bertus

    Tv oled not turn on

    hello, how is the splitted zipfile created? the same program should recreate the file again. i use 7zip many times. bertus
  16. bertus

    My subwoofer is making a thundering noise, can anyone help?

    Hello, What happens when you short the aux inputs? Bertus
  17. bertus

    Burnt resistor’s value for MAS830L multimeter

    Hello, In my DT830 the 10 A shunt is a piece of thick wire: Bertus
  18. bertus

    Burnt resistor’s value for MAS830L multimeter

    Hello, In all Mastech 830 schematics, the 10 A shunt is 0.01 Ohms. When one is 0.15 Ohms, the other should be close to 0.01 Ohms. Bertus
  19. bertus

    Burnt resistor’s value for MAS830L multimeter

    hello, where in the schematic are the 0.05 and 0.15 located? what is the reference number? bertus
  20. bertus

    Burnt resistor’s value for MAS830L multimeter

    hello, R11 is the 10 A shunt. in the schematic it is 0.01 Ohm bertus
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