If the existing transformer was replaced then ?
One transformer for the +-50VDC unregulated
One additional transformer for the new regulated
Not necessary, just 1 small transformer for the new preamp. Something with 2 x 15V 300mA AC to make +/-17v DC. For the rest you can use the old transformer.
It is caused by the very strange poweramp setup were the regulated and unregulated +/-50v supply are connected.
Big 60hz spike is from ground loop or transformer magnetic field.
Big 60hz spike is from ground loop or transformer magnetic field.
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At the X,s in the schematic looks very strange. Here regulated and unregulated get connected. In the original it is not there.
Do you have any idea how to accomplish this?
Make sure that the .sub file is located in the "sub" subfolder within the LTspice library directory.
Make sure that the .sub file is located in the "sub" subfolder within the LTspice library directory.
More resistor footprints on the pcb allow more versatility.
A major advantage is the ability to add resistors to increase the current capability of the power supply filter.
A major advantage is the ability to add resistors to increase the current capability of the power supply filter.
Pretty elaborate tone control circuit the thing has. It appears this version has the "defeat" switch; I suppose they figured they're losing sales without it. Not that any customer could conceive its possible to design Bass and Treble controls that effect neither frequency nor phase when set in the flat position - gotta have the switch there - "now I feel more comfortable..."
Perhaps this design accomplishes just that - and they put the switch in anyway.
Perhaps this design accomplishes just that - and they put the switch in anyway.
This appears to answer my initial question and post #34. Now to use this as a base to design a power supply with multiple voltages for my application. Plus to see if the denoiser will be of any benefit.
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