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  1. bertus

    Pseudo randomness based on this

    Hello, The circuit is ment to be used with 40106 or 7414 oscillators. The 40106 can be CD40106 or HEF40106. The 7414 can be SN74LS14, SN74HC14 or SN74HCT14. Bertus
  2. bertus

    Pseudo randomness based on this

    Hello, The following page will show you the working of the R-2R DAC: https://www.electronics-tutorials.ws/combination/r-2r-dac.html For the capacitors electrolitic as other types can be used. Bertus
  3. bertus

    POT burning/candle-like smell

    Hello, What is the powerrating of the pot? At the moment it will have to dissipate (14 Volts X 14 Volts) / 1 K = 0.196 Watts Bertus
  4. bertus

    A simple electric fence idea

    Hello, Your circuit would be extremely dangerous. Have a look at the circuit in this dutch magazine: https://archive.org/details/elektuur-510-2006-4 You will find the article on the pages 28 to 30. Bertus
  5. bertus

    Lead acid battery minimum discharge level

    Hello, The following pahes of the battery university might give you some extra info: https://batteryuniversity.com/article/bu-201-how-does-the-lead-acid-battery-work https://batteryuniversity.com/article/bu-804-how-to-prolong-lead-acid-batteries...
  6. bertus

    Connecting a LED directly to a 230v isolation transformer

    Hello, A led can handle a reverse voltage upto about 5 Volts. When the reverse voltage is higher, the led will be destroyed. Have a look at this page for more info: http://lednique.com/technology-basics/failure-modes-leds/ Bertus
  7. bertus

    70's style music lightbox

    Hello, @Harald Kapp When you fill in the URL into the google translate, you will get a translated page. Here is the filter page from the site: https://www-urlaub--und--hobby-de.translate.goog/lichtorgel/10-filter.html?_x_tr_sch=http&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=nl&_x_tr_pto=wapp Bertus
  8. bertus

    how to create autoswitching circuit for 12v ups for router

    Hello, One thread is enough: want to create auto switching ups for router Bertus
  9. bertus

    Beginners book

    Hello, Did you have a look at the textbooks of the partner site All About Circuits: https://www.allaboutcircuits.com/textbook/ Perhaps this page has some books for you: https://archive.org/details/folkscanomy_electronics?sort=-publicdate&and%5B%5D=language%3A%22English%22 Bertus
  10. bertus

    Comedy Thread

    Thanks djsfantasi AAC
  11. bertus

    Wanted: Motorola m7549 Transistor/voltage regulator

    Hello, Are there more details on the part? A picture would help. Bertus
  12. bertus

    telephone receiver

    Hello, What do you mean with "telephone receiver"? If it is the horn of an old analog telephone, there will be two wires for the speaker and two wires for the mike. Bertus
  13. bertus

    Pulsate 1.5v D cell battery

    Hello, There is a low voltage 7400 variant called the 74auc00. It won't be easy to use as it is only available in a QFN package. It will work from 0.8 to 2.7 Volts. Bertus
  14. bertus

    Pulsate 1.5v D cell battery

    Hello, If the oscillator should also run on the 1.5 Volts D cell, your possibilities will be very low. There are hardly chips that will run on 1.5 Volts. Bertus
  15. bertus

    PullUp Resistor

    Hello, Have a look at this page: https://www.electronics-tutorials.ws/logic/pull-up-resistor.html Bertus
  16. bertus

    Pseudo randomness based on this

    Hello, The 4 oscillators are so called relaxation oscillators: Bertus
  17. bertus

    Comedy Thread

    Thaks SamR aac
  18. bertus

    Pseudo randomness based on this

    Hello, The chip can be an 40106 cmos inverter or 74(ls)14 ttl inverter. There are 6 inverters in each chip. The CD40106 will work from 5 to 15 Volts. The 7414 will work on 5 Volts. See the attached datasheets for more info. Bertus
  19. bertus

    Pseudo randomness based on this

    Hello, In the schematic you see 2R and R. This means that the resistors 2R have twice the value of R. For example : 20K for 2R and 10K forR. Bertus
  20. bertus

    Why a Diode in this circuit?

    Hello, When LCD_BLED is high, the current source will deliver the mentioned 58 mA. When LCD_BLED is low, the current source will deliver the mentioned 2.5 mA, with the use of D2. Bertus
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