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Chip Amps Amplifiers based on integrated circuits

turn-off transients with LM1875
turn-off transients with LM1875
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Old 1st July 2003, 04:57 PM   #11
JOE DIRTŪ is offline JOE DIRTŪ  Canada
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a cap across the switch contacts also helps...I use .01uf 250vac ceramic

DIRTŪ
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Old 1st July 2003, 05:12 PM   #12
fedde is offline fedde  Netherlands
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Or make mute switches for the speakers. The original GC has them too. I also found that an oscillation causes turn-off transients.

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Old 2nd July 2003, 03:40 AM   #13
ashwin is offline ashwin  India
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Quote:
Originally posted by JOE DIRTŪ
a cap across the switch contacts also helps...I use .01uf 250vac ceramic

DIRTŪ
Yes, that's what finally worked for me. I tried a spice sim, and I found that a resistor in series with the cap (say 470n in series with 330ohm) brings down the spike drastically compared with just the cap. But in my actual amp the cap alone worked just fine.

Now I need to rig up a good EMI filter...
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