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Chip Amps Amplifiers based on integrated circuits

Speaker vibrate no signal
Speaker vibrate no signal
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Old 5th November 2017, 08:33 AM   #1
rahulrahullll is offline rahulrahullll
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Join Date: Dec 2014
Arrow Speaker vibrate no signal

tda 2050 working sound ok


components tightly soldered--dual rail--16.5-0-16.5 v transformer--2200 uf/50 v 2 caps

--but----


signal cable not connected------speaker vibrating little bit

signal cable connected--------speaker vibrating little bit----but when signal cable is adjusted pushing a little bit inside in pc sound out jack---no speaker vibration


---------IS THIS NORMAL THING OR ANY PROBLEM ? ---------
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Old 5th November 2017, 08:40 AM   #2
Mooly is offline Mooly  United Kingdom
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Speaker vibrate no signal
Do you mean hum ?

Yes, it can be normal for an unterminated input to pick up noise. If you short the input to ground (shorting plugs) then the amp should be silent.
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Old 5th November 2017, 09:37 AM   #3
rahulrahullll is offline rahulrahullll
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am i able to explain now clearly

signal cable not connected, when i touch the speaker it is vibrating little bit

signal cable connected, when i touch the speaker vibrating little bit, but when signal cable is adjusted pushing a little bit inside in pc sound out jack, no speaker vibration

Is this normal or any problem?
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