Hello all,
I'm here because I have build a power amp base on an Onkyo topology.
The preamp board (build by me) use a NJW1194.
All is nice with a power output from 0 to around 50W, but at this point, I see on the scope that the signal on the output of the NJW1194 is degraded (noise), and the the signal voltage decrease when the power increase !
I seen for example that on the ONKYO A9010 (use NJW1194) that they have added a "buffer" between the NJW and the power amp (L-OUT and R-OUT is the P-amp):
Is it a solution for my issue ?
Without power amp connected, my NJW work fine when I increase the volume, no noise or distortion on the scope.
Edit : I measured 140W RMS with 6ohm load, for information if need
I'm here because I have build a power amp base on an Onkyo topology.
The preamp board (build by me) use a NJW1194.
All is nice with a power output from 0 to around 50W, but at this point, I see on the scope that the signal on the output of the NJW1194 is degraded (noise), and the the signal voltage decrease when the power increase !
I seen for example that on the ONKYO A9010 (use NJW1194) that they have added a "buffer" between the NJW and the power amp (L-OUT and R-OUT is the P-amp):
Is it a solution for my issue ?
Without power amp connected, my NJW work fine when I increase the volume, no noise or distortion on the scope.
Edit : I measured 140W RMS with 6ohm load, for information if need
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Sorry, I don't use the good words 😉
Nop, I just increase the input voltage (source).
Power supply voltage is around +/- 60V in all cases.
I'd check the datasheet, there may be some reference to drive levels and distortion vs power output. Also, I'd have a very good look at the +/-7.5V supply rails to see if this could be a source of your noise?