LM4702 biasing
Hello R.,
I bought a pair of LM4702 amps prebuild driving a single pair K1058/J162 ;one of the channel Voltage measuring across 0,22R is
30V (simple bias system ,just a VR 1K) instead of 20mV of other channels ;this value also found at the sink-source of its LM4702 .
I swapped it with a new LM4702 ,the initial voltage was 10 volt ,after
2 hours 6V ,VR at minimal setting .(still FAR from 20mV )
Help is needed ,please .
Hello R.,
I bought a pair of LM4702 amps prebuild driving a single pair K1058/J162 ;one of the channel Voltage measuring across 0,22R is
30V (simple bias system ,just a VR 1K) instead of 20mV of other channels ;this value also found at the sink-source of its LM4702 .
I swapped it with a new LM4702 ,the initial voltage was 10 volt ,after
2 hours 6V ,VR at minimal setting .(still FAR from 20mV )
Help is needed ,please .
Let me understand...
You measured 30v across the .22 resistor?
In that case your .22R resistor must be faulty.
You measured 30v across the .22 resistor?
In that case your .22R resistor must be faulty.
Hi P.
Yes ,you are right 😱ne of the 0.22R is faulty .I replaced both with a set
old surplus ,the K162 exploded .will report back one it 's corrected.
Thanks man.
Yes ,you are right 😱ne of the 0.22R is faulty .I replaced both with a set
old surplus ,the K162 exploded .will report back one it 's corrected.
Thanks man.
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