Hi,
Are the speakerscontinously connected?
If yes, then the capacitors are charged very fast with the speaker resistance.
I'd check the bypass and shutdown connections.
A more detailed description and a complete schematic where we see the input and the shutdown connection can help.
What exactely happens during the 2 minutes? Noise? Current, voltage...
Klaus
I suspect that this amplifier is driving tweeters that have series highpass filter capacitors.
Your tiny speakers might sound like tweeters but they have a voice coil that is about 3 ohms so the 470uF output capacitors should charge or discharge in about 0.07 seconds.
Do the tiny speakers have other capacitors in series?
Hi,
Definitely:
With the given circuit and the directely connected speakers... the 100k resistors will have no notable influence.
There must be an issue elsewhere.
*****
Capacitor polarity.
You need to connect the capacitors with the shown polarity. Otherwise you risk to kill the speakers and/or the capacitors.
Klaus
Are you sure that the electronic volume control and mute are working correctly? The simple loudspeaker arrangement is unlikely to give you this sort of problem.
Frank
Are you connecting the speakers from output to ground?
Hi,
4 Ohm parallel to 100k gives 3.99984 Ohm. You see the nuance?
I expect abad solder joint, or something similar....
Klaus
In order eliminate "clicks and pops", all capacitors must be discharged before turn-on. Rapidly switching VDD may
not allow the capacitors to fully discharge, which may cause "clicks and pops".
How can the output capacitor charge to -10V when there is no negative power supply?I put output voltage on scope and see when i reset power this capacitors charged to about -10V
it eventually reach to zero and then after a loud click my speakers responding.
I change 100k resistors to 4.7k and my problem solved mostly.
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