hi
UJ3N065080K3S model is already in FULL_JFET.txt, but i don't know if it's a good idea to use a mosfet in the diagram
but i donc know how to create a Jfet subckt
yes R6 need to be adjusted but the quiescent current is not a problem.
In simulation the gain is too high, my 2sj103 model should be wrong
UJ3N065080K3S model is already in FULL_JFET.txt, but i don't know if it's a good idea to use a mosfet in the diagram
but i donc know how to create a Jfet subckt
yes R6 need to be adjusted but the quiescent current is not a problem.
In simulation the gain is too high, my 2sj103 model should be wrong
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Hi!
In the next thread there are 2sj103 models (JFET and MOSFET SPICE models). It seems that this is the only 2sj103 model that can be found.
.model 2SJ103Y PJF(beta=1.053m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=34.8 mfg=TOSHIBA)
.model 2SJ103GR PJF(beta=2.283m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=16 mfg=TOSHIBA)
.model 2SJ103BL PJF(beta=5.092m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=7.2 mfg=TOSHIBA)
In the next thread there are 2sj103 models (JFET and MOSFET SPICE models). It seems that this is the only 2sj103 model that can be found.
.model 2SJ103Y PJF(beta=1.053m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=34.8 mfg=TOSHIBA)
.model 2SJ103GR PJF(beta=2.283m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=16 mfg=TOSHIBA)
.model 2SJ103BL PJF(beta=5.092m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=7.2 mfg=TOSHIBA)
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I also found such models:
.MODEL 2SJ103 PJF(BETA=2.197M RS=76.76 RD=76.76 BETATCE=-.5 LAMBDA=735.3U VTO=-2.037 VTOTC=-2.5M CGD=18.95P M=.5045 PB=.3905 FC=.5 CGS=17.02P ISR=38.48F NR=2 IS=3.848F N=1 XTI=3 ALPHA=10U VK=100 KF=1E-18 AF=1)
.MODEL 2SJ103BL PJF (BETA=898.438U IS=10F RD=200 CGD=11.9398P CGS=14.4P)
.MODEL 2SJ103GR PJF (VTO=-1.62622 BETA=16.1875M LAMBDA=1M IS=10F RS=186.826 CGD=13.2918P CGS=14.3694P PB=806.232M KF=0.001F AF=500M)
.MODEL 2SJ103 PJF(BETA=2.197M RS=76.76 RD=76.76 BETATCE=-.5 LAMBDA=735.3U VTO=-2.037 VTOTC=-2.5M CGD=18.95P M=.5045 PB=.3905 FC=.5 CGS=17.02P ISR=38.48F NR=2 IS=3.848F N=1 XTI=3 ALPHA=10U VK=100 KF=1E-18 AF=1)
.MODEL 2SJ103BL PJF (BETA=898.438U IS=10F RD=200 CGD=11.9398P CGS=14.4P)
.MODEL 2SJ103GR PJF (VTO=-1.62622 BETA=16.1875M LAMBDA=1M IS=10F RS=186.826 CGD=13.2918P CGS=14.3694P PB=806.232M KF=0.001F AF=500M)
Hi Seb!
It is very good that you have completed this circuit. It would be nice to collect and listen to it.
And also check for thermal stability. Spring. I don’t want to do anything.😉
It is not completed circuit, just a test and not thermal stable with general ccs.
I need to found a negative CCS
I need to found a negative CCS
I measured the output impedance of the amplifier by the method of two loads at different values of the quiescent current.
I = 100mA / Rout = 0.14R
I = 200mA / Rout = 0.12R
I = 300mA / Rout = 0.12R
I = 100mA / Rout = 0.14R
I = 200mA / Rout = 0.12R
I = 300mA / Rout = 0.12R
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Measured its stock SIT-JFET KP802A (КП802А).
A total of 114 pieces, 87-92 production years.
Began to disassemble the "fours".
In the attachment is a table of those with the highest drain current initial, the tip of the iceberg.
Schedule for the "average" of the four transistor 57 / 98 - 36 / 37.
Average parameters calculated: Ri=(15-5)/(1,89-0,747)= 8,7 Ohm, S=(2,27-1,49)/(1,5-0,5)=0,78 A/V, u=RixS=6,8 units.
Output impedance of the common-drain amplifier:
1/S=1,28 Ohm.
It is seen that the output arm voltage should be kept 18-19 V. For these numbers.
A total of 114 pieces, 87-92 production years.
Began to disassemble the "fours".
In the attachment is a table of those with the highest drain current initial, the tip of the iceberg.
Schedule for the "average" of the four transistor 57 / 98 - 36 / 37.
Average parameters calculated: Ri=(15-5)/(1,89-0,747)= 8,7 Ohm, S=(2,27-1,49)/(1,5-0,5)=0,78 A/V, u=RixS=6,8 units.
Output impedance of the common-drain amplifier:
1/S=1,28 Ohm.
It is seen that the output arm voltage should be kept 18-19 V. For these numbers.
Attachments
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Hi do you think this amplifier could be used with lateral mosfet ?
I have 4 exicon ECW20N20-S
I have 4 exicon ECW20N20-S
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Muscovites listened to the amplifier on 2SK1529, 2SK1530 and got a good result.
ECW20N20 excellent transistors
HI nice 🙂
so he start from this one :
https://www.diyaudio.com/forums/att...circlotrons-negative-feedback-_-1_303-104-jpg
so he start from this one :
https://www.diyaudio.com/forums/att...circlotrons-negative-feedback-_-1_303-104-jpg
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in fact all my transistors are with my parents since I was preparing the sale of my house before the quarantine, so I cannot check what I have now
But I have the 4* ECW20N20-S and I know I have J113, 2SJ103Y, 2SK246Y, 2SK246GR
y could buy J112 or J111 from mouser
do you have the final values used by Alexey Semin ?
But I have the 4* ECW20N20-S and I know I have J113, 2SJ103Y, 2SK246Y, 2SK246GR
y could buy J112 or J111 from mouser
do you have the final values used by Alexey Semin ?
In the amplifier of Alexey: VT7-VT12 - J112.
VT5, VT6 - 2SJ103BL. VT1- VT4 - transistors of domestic production.
Not possible to order at PCBWay because of errors
Trying to order the board at PCBWay gives me an error from them: "Failed reason: Board outline is not clear"
The ZIP-file with the Gerbers are not possible to download, either. Problem seems to be that one layer has a square board, some other layer has rounded corners.
Trying to order the board at PCBWay gives me an error from them: "Failed reason: Board outline is not clear"
The ZIP-file with the Gerbers are not possible to download, either. Problem seems to be that one layer has a square board, some other layer has rounded corners.
