LME49830 in TINA

[kees52]

Yess we need a buffer, and ne5532 with 20v

En more


how much output, mosfet = 8 volts. and the old ne5534 no not me.

have you .asc?.

 

[UltimateX86]

I look if I find the simulation that I tried but it did not work

on output I need only one 16A latfet with 35V supply, so NE5532 is enough
with 20V supply

 

[UltimateX86]

maybe not complete

 

[kees52]

Yess we need a buffer, and ne5532 with 20v

I did drawn it, the 15 volts are not enough or you want low power, with the buffers, then you need there much higher voltage otherwise one side clips earlyer (voltage - voltage needed for bias)

Wthe te buffer it works.

A compound hybrid can work here if you let it give x4.

regards

 

[kees52]

I look if I find the simulation that I tried but it did not work

on output I need only one 16A latfet with 35V supply, so NE5532 is enough
with 20V supply

for a fet you need 8 volts higher input then output, a compound can prevent that because it is a local feedbacked output stage.

 

[kees52]

this output stage does give extra gain, it is a compound with gain. the irf driver can also be a bjt then it is a hybrid.

quite liniair too.

regards

 

[UltimateX86]

look at the performance of this scheme

i have more than 30V on output with only 24V on opa

 

[U130421]

I will try a montage with 2SK1058, too scared to burn my ecw20n20

what do you recommend as usb oscilloscope?

This is the best Function/price I recommend. I have regrettably without the generator (45$) as I didn't knew it can use it to trace automatically frequency response/phase curves . 8 bit is just enough to measure distortion with spectrum analyzer down to 1% or else 12bit is to choose about 95$.
ISDS205B 5 IN 1 Multifunctional PC Based USB Digital Oscilloscop/Spectrum Analyzer/ DDS/Sweep/Data Recorder 20M 48MS/s Free Ship-in Oscilloscopes from Tools on Aliexpress.com | Alibaba Group
I tried to create TSM file for 20N20 from the spice model you gave , unfortunately Tina sees syntax error.

 

[U130421]

jackinnj , thanks for the lm4702 advice . It costs 37$ a pair , too expensive for me.

 

[UltimateX86]

Thanks, so you have the A version and you recommand the B version with generator ?

 

[U130421]

Yes , the generator is low distortion 20Mhz sine ,triangle, square and the frequency can be sweeped by the spectrum analyzer . You can observe the frequency/phase response of the circuit while adjusting it. How I regret not to have it .

 

[UltimateX86]

this output stage does give extra gain, it is a compound with gain. the irf driver can also be a bjt then it is a hybrid. quite liniair too. regards

Hello, What do you use as driver on this compound with ECW20N20 ? Waiting to have my oscilloscope to test the lme49830 without output, I simulated some discret amp based on yamaha circlotron : Nextcloud circlotron diyaudio I created a public space on my site, where we can upload and read file ... for diyaudio the root directory : Nextcloud diyaudio

 

[kees52]

The lateral mosfet has quite low gate capacitance, so this need not such a big driver, do you want use a bjt (hybrid) or a mosfet for drive? for both it is not critical, but how better the current to drive the wider the bandwith afzuse, a 500 mA to 1 amp is enough, or the irf610 ir itf 6910 mostet as drive what I did.

regards

 

[UltimateX86]

I prefer bjt for low capacitance but mosfet should be more stable ?

 

[UltimateX86]

Have you seen this?

Not compound but a solution to bias

Circlotron—Once Again

 

[kees52]

I have already, somewone did help me also with that, but do is now not active because of work home.

regards

 

[kees52]

I prefer bjt for low capacitance but mosfet should be more stable ?

Mosfets are more prone for oscillation because of gate capacitances, who can couse fase shift, so proper idle current driver do work keeping fase to zero.

 

[kees52]

Here some changes, just sim.

put in a compound output, one with njt driver and one with mosfet, last has less distortion..

 

[UltimateX86]

thank you

could you post a version with 35v on output and with model in the schematic ?

with model i found, i have more distortion with mosfet

could you keep 20n20 for output mosfet ?

the ksa1220 must not be better driver than mje ?

.MODEL KSA1220 PNP IS=4.7863E-13 BF=289.3 BR=9.76 NR=1.006 ISE=5.2481p NE=2 ISC=2.4909E-11 NC=1.5 VAF=98.5 VAR=6.7 IKF=2.7061 IKR=0.0759 RB=2.26 RBM=0.2308 IRB=0.001 RE=0.1908 RC=1.1748 QCO=0.02 RCO=3.9811 VO=11.078 GAMMA=5.01187E-8 CJE=3.4786E-10 VJE=0.9575 MJE=0.4694 FC=0.5 CJC=1.1224E-10 VJC=0.5761 MJC=0.4365 XCJC=0.4955 XTB=1.7978 EG=1.2255 XTI=3

 

[UltimateX86]

i have 3amp on output mosfet OUCH