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  1. bertus

    Stage Line 500W amp repair project

    Hello, You could use one TL032 for X1 and X2, a second one for X3 and X4 in the schematic @WHONOES posted. If you want some info on basic opamp circuits have a look in this book: https://www.mouser.com/pdfDocs/analogengineer%E2%80%99scircuitcookbookopamps.pdf Bertus
  2. bertus

    Stage Line 500W amp repair project

    Hello, Are you using the TL032? Have a look at the datasheet. Enhanced-JFET Low-Power Low-Offset Operational Amplifiers datasheet (Rev. C) In there you will find this: Bertus
  3. bertus

    Stage Line 500W amp repair project

    Hello, If you need to buy IC sockets, go for the turned ones: I have had some bad experiences with the dual leaf types. Bertus
  4. bertus

    LC parallel tank circuit

    Hello, In the old days we used a grid dip meter to determine the frequency of a LC circuit: http://sm0vpo.altervista.org/use/gdo.htm Bertus
  5. bertus

    Hitachi KH-1190E radio stopped working

    Hello, The 0.290 will be correct as the 1N60 is a germanium diode. Bertus
  6. bertus

    Looking for an unusually large capacitor or a replacement

    Hello, Would this fit? https://nl.farnell.com/vishay/mal205157472e3/cap-4700-f-40v-20-through-hole/dp/1166565 See the datasheet for the pin arrangement. Bertus
  7. bertus

    And now something weird

    sheep behind headlights.
  8. bertus

    How can I simplify it? equivalent resistance

    Hello, That is correct when R57 is R5+R7. Bertus
  9. bertus

    How can I simplify it? equivalent resistance

    Hello, What about R1? Bertus
  10. bertus

    How can I simplify it? equivalent resistance

    Hello, That is not all correct. Have a look at the schematic when we draw it a little different: Can you now tell wich resistor is in series and wich in parallel? Bertus
  11. bertus

    How can I simplify it? equivalent resistance

    Hello, Have a look at the schematic. Wich resistors are in series and wich are in parallel? Have a look at this page from the textbook: What are “Series” and “Parallel” Circuits? Bertus
  12. bertus

    Stage Line 500W amp repair project

    Hello, No need to login. https://uk.farnell.com/rubycon/35ml10mefc4x7/cap-10-f-35v-20/dp/8126542?ost=8126542 Bertus
  13. bertus

    Analog Dialogue

    Hello, Here I found a couple of pages on Analog Devices. The first will lead you to a collection of magazines: https://www.analog.com/en/analog-dialogue/archives.html The second one to the RAQS: https://www.analog.com/en/analog-dialogue/raqs.html Bertus
  14. bertus

    Stage Line 500W amp repair project

    Hello, Have a look at the attached PDF. Page 10.5 will show you info on capacitors. Page 10.21 will show you info on resistors. Bertus
  15. bertus

    Stage Line 500W amp repair project

    Hello, If you want to learn some more about capacitors, have a look at this site: http://www.iequalscdvdt.com/ Bertus
  16. bertus

    Hitachi KH-1190E radio stopped working

    Hello, On the top right corner this is given on page 3 of the given document for D3: It seems to be an 1N60. Bertus
  17. bertus

    Stage Line 500W amp repair project

    Hello, Did you see the remark in post #515? The voltage is not that importent, as long it is more than about 1.5 times the voltage supplied. Bertus
  18. bertus

    Stage Line 500W amp repair project

    Hello, Farnell states that the chip given on ebay (TL034IN) is obsolete. This is the TL034CN at Farnell: https://uk.farnell.com/texas-instruments/tl034cn/ic-op-amp-quad-jfet-dip14/dp/3117748?scope=partnumberlookahead&ost=TL034CN&searchref=searchlookahead&exaMfpn=true But that had a large lead...
  19. bertus

    Stage Line 500W amp repair project

    Hello, C1 can be non-polarized. C2 can be polorized. They are decoupling capacitors. This thread on AAC will tell you more about those capacitors: Decoupling or Bypass Capacitors, Why? Have a look here for the TL034 https://www.ti.com/product/TL034 Bertus
  20. bertus

    Unknown Chip In My Vaporizer

    Hello, I can not read anything on the chips. I have downloaded the large pictures, but also the text is unreadable. Can you make sharp close-up pictures of each chip (I see 3 chips)? Bertus
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