Search results

Search Forums New Posts
  1. bertus

    Why a Diode in this circuit?

    Hello, Sorry, but the 12 comes from R40, the current setting resistor. Bertus
  2. bertus

    Transformerless audio amplifier

    Hello, The shown powersupplies are not bulky, they do not have a large transformer, as they are switch mode powersupplies. They are like the powersupplies used in a PC. Also a powerbrick from a laptop can be used. That will supply you with 19 Volts. Bertus
  3. bertus

    Transformerless audio amplifier

    Hello, There are powersupplies under 10 pounds: https://uk.farnell.com/w/c/power-line-protection/power-supplies/ac-dc-converters/ac-dc-enclosed-power-supplies?range=inc-in-stock&sort=P_PRICE Bertus
  4. bertus

    A recommended free online schematic creator ????

    Hello, You can also download some extra components from the links in this thread on All About Circuits: The libraries and components models of LTspice free download. Bertus
  5. bertus

    Capacitive supply...

    Hello, @Externet , Your circuit shows a voltage doubler. See this page for more info: https://www.eeeguide.com/voltage-doubler-circuit/ Bertus
  6. bertus

    Pseudo randomness based on this

    Hello, Here is a little circuit from my own design. It contains 4 oscillators made from a inverter chip and a R-2R network for voltage creation. It will create a random voltage of 16 levels: As you can see the oscillators have all different frequencies. Bertus
  7. bertus

    how to identify max forward current in an infrared LED with no spec sheet

    Hello, IR leds can have currents upto 100 mA. The TSAL6200 and TSAL6400 are some examples. Bertus
  8. bertus

    Help identify a component, EZ3MY535!

    Hello, Z3M Z0103MN SGS-Thomson Microelectronics SOT-223 Triac 600V, 1A, 1W, Vtm<1.56V, <Igt>3mA From this page: https://smd.yooneed.one/code5a33.html Bertus
  9. bertus

    Simple Waveform Generator Help

    Hello, There are many "copies" of the ETI magazines available from AU, CAN en UK: https://worldradiohistory.com/ETI_Magazine-AU.htm https://worldradiohistory.com/ETI_Magazine_Canada.htm https://worldradiohistory.com/ETI_Magazine.htm There will be likely some overlap. Bertus
  10. bertus

    Unknown traffic Relay Identification?

    Hello, Perhaps he can find some here: https://relays.struthers-dunn.com/category/all-categories-traffic-relays-2 Bertus
  11. bertus

    Simple Waveform Generator Help

    Hello, Here is an other old circuits book: https://archive.org/details/coll.-the-giant-book-of-electronics-projects-1982-tab-books/mode/2up Bertus
  12. bertus

    Simple Waveform Generator Help

    Hello, Take the first part of the circuit in figure 1 on this page. Put a resistor of 10K to ground after the diodes, instead of the second 555 circuit. https://www.eleccircuit.com/simple-sound-effect-generator-circuit-using-ic-555-and-ic-4017/ Bertus
  13. bertus

    Simple Waveform Generator Help

    Hello, Do you mean an arbitrary waveform generator? That can be quite complex...
  14. bertus

    Simple Waveform Generator Help

    Hello, You might also be interested in the following magazine: https://archive.org/details/electronics-australia-electronic-test-gear/mode/2up Bertus
  15. bertus

    Why a Diode in this circuit?

    Hello, Without the diode there might be a chance that the controller gets damaged by overcurrent on the LCD-BLED pin. With the diode, the voltage can go high without restriction, as the diode is reversed biased. When the LCD-BLED pin is low (0.4 Volts as said), the voltage on the base of Q1...
  16. bertus

    What is the component

    Hello, Have a look at this page for noise reduction ferrite beads: https://www.murata.com/en-global/products/emc/emifil/overview/lineup/bl And this page: https://www.analog.com/en/analog-dialogue/articles/ferrite-beads-demystified.html Bertus
  17. bertus

    Cable Connectors

    Hello, @TCSC47 , I have collected about 6000 datasheets on my PC over the years. For old datasheets and books, have a look here: http://bitsavers.org/components/ All ordered by manufacturer. I have downloaded that complete folder containing more than 3000 books, 55 Gb on disk. McMaster seems...
  18. bertus

    Simple Waveform Generator Help

    Hello, The output signal intensity will vary with the frequency. This more advanced circuit uses a triangle generator with a comparator for squarewave and a diode level break circuit for sinewave: https://www.gadgetronicx.com/function-generator-circuit-opamp/ There is even a PCB given for easy...
  19. bertus

    Cable Connectors

    Hello, The hardwarebook has a lot of info: http://www.hardwarebook.info/ It will shows you the signals in the connectors. Unfortunately it does not show dimenions. Bertus
  20. bertus

    Is this a transformer???

    Hello, Try to make a picture of about 300 kB and post it on the forum using the upload a file button. Pictures on hosting sites may get lost over time. Bertus
Top