sauce Posted January 24, 2013 Share Posted January 24, 2013 A capacitor, something about 10nF, connected between pin 1 and earth will help with RF interference suppression. So I could put a capacitor (power supply side) between pin 1 of XLR and earth (to shell of power supply) ? Link to comment Share on other sites More sharing options...
boatman Posted January 24, 2013 Share Posted January 24, 2013 A bit late here, but the schematic for the original Tecpro power supply can be found on the Wayback Machine internet archive. http://web.archive.org/web/20070202232635/http://www.beltpack.com/tec-ps-circuit.pdf The schematic for the BP1 beltpack also used to be there, but I can't find it now. Link to comment Share on other sites More sharing options...
Brian Posted January 24, 2013 Share Posted January 24, 2013 So I could put a capacitor (power supply side) between pin 1 of XLR and earth (to shell of power supply) ? Yes. Link to comment Share on other sites More sharing options...
sauce Posted January 24, 2013 Share Posted January 24, 2013 I found it :http://web.archive.org/web/20060517172159/http://www.beltpack.com/tec-bp1-schematic.pdf Link to comment Share on other sites More sharing options...
sauce Posted January 25, 2013 Share Posted January 25, 2013 A capacitor, something about 10nF, connected between pin 1 and earth will help with RF interference suppression. So I could put a capacitor (power supply side) between pin 1 of XLR and earth (to shell of power supply) ? What kind of capacitor should I use ? Link to comment Share on other sites More sharing options...
fpn Posted February 12, 2013 Share Posted February 12, 2013 Thank you for your help. I read your advices and tried.put a new C9 but the issue remains. I assume C9 was ok. Note that it is chemical 4.7uF (not tantalum 47) I measured V on NE5534 at pins 2 & 3 ; both are going down to 6V instead of being around 12V - arghI forgot measuring using pin6. will try soonSometimes, when I use my old analog multimeter, the mic sound is back for a few seconds. I plan to investigate the feedback circuit R10 R11 C5 C8. I found two options in the original Clearcom the device cloned by rcrowley (http://www.clearcom.com/upload/download/manual_pl_mr102a.pdf - The schematic is on the last page)On page3 there is a proposal for changes in values to increase mic gain New values are R5=R8=270K C5=27pF C8=150pF. I'll try this alsoon the last page, I found in the schematics a 20uF capacitor between pin5-pin8 in the clearcom design. not familiar with opAmp. What is it for ? is it important ?have a good day.regardsFP Link to comment Share on other sites More sharing options...
Brian Posted February 12, 2013 Share Posted February 12, 2013 I found in the schematics a 20uF capacitor between pin5-pin8 in the clearcom design. not familiar with opAmp. What is it for ? is it important ?That should be 20pF, the scan is not very clear. It is there to stop the 5534 oscillating when the mute switch is pressed. [E2A]Two questions... 1) What make of 5534 are you using? 2) What make of electret mic are you using? Link to comment Share on other sites More sharing options...
sauce Posted February 17, 2013 Share Posted February 17, 2013 Hi, My 2 comclone work quite good but I have hiss at normal gain.Do you know what could be the cause ? Link to comment Share on other sites More sharing options...
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