PC power on - pulse going to amplifier

This is not power on thump..the amplifier is already switched on.... supply is there, almost 55 Volts symetrical...when i switch the computer "on" then the PC audio system send an enormous pulse....observe, condensers charged..voltage at 55V and will remain this way for several miliseconds..time enougth to burn a wrong transistor.... and have not burned the BD139 and BD140..because 80 volts of VCE is the guaranteed voltage..of course the transistor can hold more voltage..imagine if it will burn with 81 volts..factory would be very stupid producing transistors this way.

This is the Dx Blame ST, using 55V, because supply has drop..the Dx Blame ES and Dx Blame ST, the standard schematic is using 35V and limit is plus 10 percent.

Category:

Science & Technology

Tags:

• Dx
• amplifier