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Pre-Amplifier 2012 - ground connection(s)

HiFi, LoFi, Tubes, Transistors, ICs, Commercial, DIY

Postby cwi001 » Tue May 29, 2012 12:00 am

In your article (part 3, pwoer supply) you mention the importance of a single (one and only) connection between power ground and signal ground, only.
Referring to the power supply Vre is referenced to the power ground (triangle symbol) and you find a connection to the signal ground (bar symbol) via R5 (1 R). Furthermore connector K4 (which connects to K6 on the front pcb) is connected to the power ground.
On the front pcb Vre is referenced to the signal ground (bar symbol, see K6).
Doesn't this mean a second connection between the different grounds?
I would prefer to connect K6 to the power ground and (for example) replace K5 by a 3-pin connector (third pin connected to signal ground).
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