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Old 13th November 2005, 12:35 AM   #41
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just to make sure everyone is on the same page, this is the preamp circuit that carlos recommended, and the only change involved a 1uf filrter cap after the resistors for the voltage

regulators.carlosfm preamp post
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Old 16th November 2005, 01:09 PM   #42
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Quote:
Originally posted by carlosfm

Don't bother too much about a ground plane, specially around the signal pins, it creates capacitance.
Carlos, is it better not to have a GP at all or just to restrict it from the signalpins? I did draw a pcb (AD815-DIP) with the three regulators onboard and using a GP all over. It's so much easier with a GP

/Tobias
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Old 16th November 2005, 07:20 PM   #43
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Quote:
Originally posted by tobias_svensk
Carlos, is it better not to have a GP at all or just to restrict it from the signalpins? I did draw a pcb (AD815-DIP) with the three regulators onboard and using a GP all over. It's so much easier with a GP

/Tobias
I prefer a star ground.
The ground (if any) plane must be used for shielding, and connected to one point on the circuit.
It should not be used for the return currents.
IMO.
Regarding the capacitance around the chip's pins, you can see a mention on the AD815 datasheet.
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