Timeline for Audio amp testing: is this safe?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 9, 2017 at 6:37 | vote | accept | zeron | ||
| Feb 7, 2017 at 21:14 | comment | added | zeron | Tony Stewart: "no." Thank you. Because the two original noises (static & crackling) disappeared after the last test while a new noise started (more regular, like water dripping from a faucet every 20~ 40 seconds), I thought I might have damaged the amplifier. Prior to this, I touched up about 20 solder joints that didn't look quite robust and changed one power resistor [R90] because it was reading ~426 instead of specs' 750. However, the new R90 is smaller in size. That may be causing a problem. I'll post a question about this. | |
| Feb 6, 2017 at 16:37 | comment | added | zeron | Tony Stewart: "However trim the offset adjust R50 pot and feedback [K] must be connected to get 0V out." I tested the amp without any source signal inputs with the controls and LED disconnected AND without doing what you wrote. Do you think I damaged the amp? By testing, I mean just leaving the amp on for a few hours to see if the noises come on. | |
| Feb 2, 2017 at 22:31 | comment | added | D.A.S. | check all big caps for Ac ripple or ESR or C value or slight bloating lids | |
| Feb 2, 2017 at 22:26 | comment | added | D.A.S. | The PA is AC coupled with C29 so no problem. However trim the offset adjust R50 pot and feedback [K] must be connected to get 0V out. Current sense on R112 feeds [H] & [R] to disable Relay RLY1 (OV overload) | |
| Feb 2, 2017 at 22:13 | history | edited | zeron | CC BY-SA 3.0 |
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| Feb 2, 2017 at 21:16 | answer | added | Paul Elliott | timeline score: 0 | |
| Feb 2, 2017 at 20:49 | history | edited | zeron | CC BY-SA 3.0 |
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| Feb 2, 2017 at 20:02 | history | asked | zeron | CC BY-SA 3.0 |