|15th August 2010, 10:36 AM||#25|
Join Date: Jan 2006
Location: Athens GREECE
sorry guys ...i ve been way to bussy to follow the thread ...please refresh me up
yes i would like four boards ... i dont have pay pal account but i will be more than happy to pay through western union or direct bank deposit .... please email me with total cost of boards +PP+payment method / details
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
|17th August 2010, 11:16 AM||#29|
Join Date: Jul 2004
Location: Scottish Borders
Can I suggest an improved wiring arrangement for section9 of the pdf?
The two AC and centre tap be a twisted triplet to the rectifier.
The +ve,-ve and centre tap be a twisted triplet from rectifier to the smoothing capacitor bank.
The Chassis connection can as shown be from the centre of the smoothing caps.
The mains DC supplies +ve, -ve and Power Ground be taken as a twisted triplet to the amplifier Power input end.
Part way along this twisted triplet add a tapping point to the Power Ground.
Use this new point as the Main Audio Ground (Star Ground).
Take the RCA return to Audio Ground.
Take the Signal Ground and signal as a twisted pair to the RCA Hot and to the RCA Return.
Take the Speaker Return and the Signal hot/out as a twisted pair to the Audio Ground. Connect the Signal hot/out to the PCB and keep the Speaker Return continuous on it's route to the Main Audio Ground.
This arrangement removes the charging pulses and all the HF harmonics flowing between transformer and smoothing caps into a separated circuit that cannot adversely influence the circuits connected to the Main Audio Ground. This separation of Audio from Charging is important.
Last edited by AndrewT; 17th August 2010 at 11:19 AM.
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