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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old Today, 01:25 PM   #4111
coroner21 is offline coroner21
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Join Date: Apr 2014
Salas DCG3 preamp (line & headphone)
I do not hear any noise at all having the phones plugged in and nothing playing. I did not perform any measurements but the build seems completely quiet.

This is without any connection between signal GND and mains earth.

I have some noise when playing through the power amp as the speakers are higher than 90dB sensitivity and there seems to be some grounding issue. This noise however was there even before the DCG3 arrived and when the DAC was playing directly into the power amp. I will need to resolve this in the power amp.
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Old Today, 01:38 PM   #4112
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
What type of power amp is it?
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Old Today, 02:06 PM   #4113
coroner21 is offline coroner21
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Salas DCG3 preamp (line & headphone)
A DIY Pass M2 clone. It had a very low level buzzing right from the start and so far I was simply too lazy to work on it. Probably needs shielding of the input transformers or further measures. Since the noise was not really harming the listening pleasure I did not really bother to try fix it. In addition it is nice sometimes to have a reminder that your power amp is still switched on
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Old Today, 02:13 PM   #4114
jimk04 is offline jimk04  United Kingdom
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Does dcg3 output to line and HP simultaneously. So one would need to power down power amps to listen to cans?
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Old Today, 02:37 PM   #4115
coroner21 is offline coroner21
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by jimk04 View Post
Does dcg3 output to line and HP simultaneously. So one would need to power down power amps to listen to cans?
Yes
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Old Today, 03:19 PM   #4116
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
There are also phones sockets that can switch a contact and you may get creative with them. Audio Jack Switches and Configurations | DigiKey
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