Does the BC327 and sibling is not less noiser than BC550 ?
Do they need the transistor need a matching to increase the performance ?
What please is involved by the increase voltage of the rails ? (I see 9V, 15V, etc with the BC550 for instance).
Do they need the transistor need a matching to increase the performance ?
What please is involved by the increase voltage of the rails ? (I see 9V, 15V, etc with the BC550 for instance).
> Does the BC327 and sibling is not less noiser than BC550 ?
Where have all the Low Noise Transistors Gone?
> Do they need the transistor need a matching to increase the performance ?
Yes.
> What please is involved by the increase voltage of the rails ?
Try for yourself in Spice.
Patrick
Where have all the Low Noise Transistors Gone?
> Do they need the transistor need a matching to increase the performance ?
Yes.
> What please is involved by the increase voltage of the rails ?
Try for yourself in Spice.
Patrick
Thanks again Patrick. It will take me quite a while to get a feel for LT SPICE as my knowledge in this field is very limited, but I want to learn.
I see your point about the simulated distortion figures. Having listened to the circuit with BC550/560 I'd happily have believed those but it sounds superb with 2SA970/2SC2240 so at the very least I'll have some fun trying to reconcile my subjective results with the simulated ones.
Tim
I see your point about the simulated distortion figures. Having listened to the circuit with BC550/560 I'd happily have believed those but it sounds superb with 2SA970/2SC2240 so at the very least I'll have some fun trying to reconcile my subjective results with the simulated ones.
Tim
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You can change the Spice file to use 2SA970 / 2SC2240.
.MODEL 2SA970 PNP (IS=9.98557F BF=477.115 NF=965.739M VAF=64.7 IKF=116.959M
+ ISE=2.13187F NE=1.27276 BR=385.069M IKR=308.018 ISC=13.4194P RC=7.03858
+ CJE=2P MJE=500M CJC=19.116P VJC=749.982M MJC=498.685M TF=1.49138N XTF=500M
+ VTF=10 ITF=10.0655M TR=10N )
.MODEL 2SC2240 NPN (IS=9.98557F BF=444.22 NF=965.739M VAF=439.144 IKF=99.567M
+ ISE=6.48962F NE=1.29179 BR=425.865M IKR=954.972 ISC=539.648P RC=168.128M
+ CJE=2P MJE=500M CJC=11.7089P VJC=750.026M MJC=499.123M TF=1.41635N
+ XTF=499.995M VTF=10 ITF=10.055M TR=10N )
Patrick
.MODEL 2SA970 PNP (IS=9.98557F BF=477.115 NF=965.739M VAF=64.7 IKF=116.959M
+ ISE=2.13187F NE=1.27276 BR=385.069M IKR=308.018 ISC=13.4194P RC=7.03858
+ CJE=2P MJE=500M CJC=19.116P VJC=749.982M MJC=498.685M TF=1.49138N XTF=500M
+ VTF=10 ITF=10.0655M TR=10N )
.MODEL 2SC2240 NPN (IS=9.98557F BF=444.22 NF=965.739M VAF=439.144 IKF=99.567M
+ ISE=6.48962F NE=1.29179 BR=425.865M IKR=954.972 ISC=539.648P RC=168.128M
+ CJE=2P MJE=500M CJC=11.7089P VJC=750.026M MJC=499.123M TF=1.41635N
+ XTF=499.995M VTF=10 ITF=10.055M TR=10N )
Patrick