pilotdude Posted November 29, 2009 Report Share Posted November 29, 2009 PROJECT: http://www.electronics-lab.com/projects/audio/031/Hi guys! Just a quick question about the markings in the Parts List: what's that weird symbol before F in the capacitor list? Like 47΅F. Does that represent nF, or uF? It can't possibly mean a 47F capacitor for an audio circuit.Thanks for any helpEDIT: What kind of transformer is T1? What does the Output Voltage need to be, 60V or 48-50V?EDIT 2: I found the project on red circuits and that weird symbol does mean uF, which is logical. However, I still don't understand what transformer is required. I live in australia so do I need a 240VAC to 24VDC transformer or what? Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 29, 2009 Report Share Posted November 29, 2009 This site messes-up Greek letters.This circuit is from Red Circuits so go to that site to see the correct value of the capacitors. The transformer is clearly shown as 48VAC to 50VAC. When it is rectified it makes 60VDC. Its power rating is 75VA for 40W into 8 ohms and 150VA for 60W into 4 ohms. Quote Link to comment Share on other sites More sharing options...
pilotdude Posted November 29, 2009 Author Report Share Posted November 29, 2009 thanks audioguru. where could I get a transformer like this? Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 29, 2009 Report Share Posted November 29, 2009 An electronic parts distributor like Digikey or Newark in North America have everything.In some countries, nothing is available.Oh. You are in Australia? Try Dick Smith surplus old car parts or Farnell. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted November 29, 2009 Report Share Posted November 29, 2009 The capacitors are in μF.Use a transformer with twin 24V windings.It's also possible to use a transformer with a single 24V winding but the rectifier needs to be configured as a voltage doubler and the filter capacitors need to be twice the size. Quote Link to comment Share on other sites More sharing options...
pilotdude Posted November 29, 2009 Author Report Share Posted November 29, 2009 Thanks a lot guys. Would this work for the project? http://jaycar.com.au/productView.asp?ID=MT2114&CATID=19&form=CAT&SUBCATID=539Sorry, I'm no good with transformers Quote Link to comment Share on other sites More sharing options...
Hero999 Posted November 29, 2009 Report Share Posted November 29, 2009 Yes, that will do: Cat. MT-2114 25+25 Volts 3.2 amps 6.4 amps.Connect the two 25V windings in series to make 50V.Be careful, even the secondary side of the transformer is a high enough voltage to shock you, it shouldn't kill you but it will hurt. Quote Link to comment Share on other sites More sharing options...
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