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  1. bertus

    Possible new job. Looking for advice.

    Hello, I always use Yahoo advanced search. It has often other results as google or bing. In there you can type words that must be on the page, words that may not be on the page and even a phrase of text can be given: Yahoo Advanced Search You can even set the domain or filetype in the search...
  2. bertus

    I'm Back- sort of

    Hello, Do you get any audio on the test output? Only measuring DC does not say everything. If you want to hook-up the volume pot, do it like this: Bertus
  3. bertus

    Possible new job. Looking for advice.

    Hello, When you are looking for info on EMC testing, Yahoo will give you a lot of links: EMC testing Bertus
  4. bertus

    Need help determining electronic component

    Hello, Those 3 pin devices are EMI filters. Have a look at this page for more info: https://www.murata.com/en-us/products/emc/emifil/library/knowhow/basic/chapter01-p1 Bertus
  5. bertus

    I'm Back- sort of

    Hello, If you are thinking that the pots on the output are causing trouble, remove them and test if there is some signal coming out of the opamp: If nothing is coming out, there must be a fault in the setup. Bertus
  6. bertus

    I'm Back- sort of

    Hello, The following book will show you more modern opamps and their use: https://archive.org/details/fe_Op_Amp_Applications_Handbook_Newnes_Walt_Jung Bertus
  7. bertus

    I'm Back- sort of

    Hello, Watch the pinouts of the chips: The 741 is single, the 4558 is dual. Bertus
  8. bertus

    Understanding basic passive components: resistors, capacitors, inductors.

    Hello, @hevans1944 , You might be interested in the following page about capacitors: https://studyelectrical.com/2016/12/different-types-classification-of-capacitors.html Bertus
  9. bertus

    I'm Back- sort of

    Hello, The 4558 are two slightly improved 741´s in one package. The LF353 is more modern. Bertus
  10. bertus

    I'm Back- sort of

    Hello, What other opamps do you have? The LM741 is a very old opamp with not the best properties. You mentioned that you got the following opamps: UA741 J4558D LF353N The 4558 is a dual opamp with transistor inputs. The LF353 is also a dual opamp, but with fet inputs. Bertus
  11. bertus

    I'm Back- sort of

    Hello, The 500K pot should not be the problem. You can not remove the 500K pot, as the gainloop will be open. If you want some "safety" use a 1K resistor in series with the 500K pot. In that case the gain can be adjusted between 2 and 502 times. Bertus
  12. bertus

    Understanding basic passive components: resistors, capacitors, inductors.

    Hello, @hevans1944 , Did you see my tube based resource? Vintage info from the days of vacuum tubes As for some tubes theory, have a look at this old army book: https://archive.org/details/TM11-662/mode/2up Bertus
  13. bertus

    I'm Back- sort of

    Hello Sparky, Wich opamp are you actualy using? You mentioned the TL032 is one of your older threads. The TL032 is a dual opamp. Bertus
  14. bertus

    I'm Back- sort of

    Hello, You might want to read the attached PDF´s on single supply opamp circuits. Bertus
  15. bertus

    Understanding basic passive components: resistors, capacitors, inductors.

    Hello, The three volumes of the Encyclopedia of Electronics might interest you: https://archive.org/details/EncyclopediaOfElectronicComponents.Volume2CharlesPlatt/Encyclopedia Of Electronic Components Volume 1 - Charles Platt Bertus
  16. bertus

    FR & RF Thermal fuse.

    Hello, I do also not know the difference. I know there are thermal fuses with ceramic or metal bodies. There might be a difference in the breaking speed. Bertis
  17. bertus

    Comedy Thread

    strange glitch:
  18. bertus

    Which Soldering iron should I get please?

    Hello, I am quite happy with the Antex TCS soldering iron. It has temperature regulation in the handle. Bertus
  19. bertus

    I'm Back- sort of

    Hello, Have a look at this "drawing": Don´t mind the values, the drawing is just for the idea how to connect. bertus
  20. bertus

    I'm Back- sort of

    Hello, Are you sure the circuit uses a TDA2030? The TDA 2030 is a 14 Watt power amplifier. Bertus
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