Hi,
is the Power amp DC coupled?
What is the DC gain?
Multiply that gain by the worst case output offset of the pre-amp.
Is that output offset acceptable?
You have a number of solutions, I don't think you can do nothing.
a.) Insert a DC blocking cap at the power amp input, so that external offsets can't pass through.
b.) Insert a DC blocking cap in the Power amp feedback circuit to reduce DC gain to 1.
c.) Add a DC servo to the pre-amp.
d.) Add a DC detect to activate an input mute on the Power amp input.
e.) Add a DC servo to the Power amplifier.
f.) Add a DC detect to activate a speaker isolation relay/switch.
is the Power amp DC coupled?
What is the DC gain?
Multiply that gain by the worst case output offset of the pre-amp.
Is that output offset acceptable?
You have a number of solutions, I don't think you can do nothing.
a.) Insert a DC blocking cap at the power amp input, so that external offsets can't pass through.
b.) Insert a DC blocking cap in the Power amp feedback circuit to reduce DC gain to 1.
c.) Add a DC servo to the pre-amp.
d.) Add a DC detect to activate an input mute on the Power amp input.
e.) Add a DC servo to the Power amplifier.
f.) Add a DC detect to activate a speaker isolation relay/switch.
MY amp doesn’t have input cap.
What is really important is what is the gain of your power amp at DC. The absence of a cap is not really an issue if the dc gain is 1 but may not be pleasant if the dc gain is the same as the ac gain. Have you measured the dc at the speaker output?
Could I put a cap I don't know 47nF or 2,2uf, 10uF?
Sure.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Pass Labs
- UGS-DC offset