i do not understand way too many useless component, chevin amplifier sound great only OP134 and few diodes res two to92 transistors
to drive 8 pair lateral mosfet , no need vas driver etc
to drive 8 pair lateral mosfet , no need vas driver etc
You right, but i have some not good experience about opamp based amps. So we designed our tda7293 with jfe2140…. I want to build to discrete amp for my mosfets. Thanks you so much for your attention 🙏
there is a problem with the bias components or the amp was oscillating.
according to the graphs both types need approx 1.2v across bias cct for approx 100/200mA
I have 6pcs 10n20 10p20 and the others lateral mosfets. I can do good project with them but as @arjen6t8 said they are lying…
If i want to build an amp, one of them would be one of your projects.
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Vssa is nice amplifier i listen to it some times…also fixed bias problem with 10n20 and 10p20
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Double transconductance -> lower Vgs required for the same current -> useful with low supply voltage and follower output stages.
Lower distortion for the same circuit, as well. 😎
It’s max 25 very clean W to 4Ω. I’m currently driving magnepans with it and it is loud.
However, for more power with laterals, I don’t believe there are better designs than those by @dadod. 120W or 200W designs available:
https://www.diyaudio.com/community/threads/200w-mosfet-cfa-amp.243481/
https://www.diyaudio.com/community/threads/lateral-cfa-120w-bsa.338814/
Unfortunately I have no SPICE models for these transistors.
But ECF20N20/ECF20P20 also have double die, but in T-O3.
For those I have SPICE.
Should it be possible to use these models for ECW20N20/ECW20P20?
Are they similar in parameters?
But ECF20N20/ECF20P20 also have double die, but in T-O3.
For those I have SPICE.
Should it be possible to use these models for ECW20N20/ECW20P20?
Are they similar in parameters?
ECW vs ECF. AFAIK they are the same die in different packages.
Excellent ECW and ECX models by IanH & keantoken were posted many times in different threads related to designs with laterals, so you should easily find them.
Excellent ECW and ECX models by IanH & keantoken were posted many times in different threads related to designs with laterals, so you should easily find them.
I have those IanHegglun models.
But my Multisim can not use them.
I have tried several ways.
For the first there no 'VDMOS' in Multisim. Only NMOS and PMOS
But I can and will use ECF20N20/ECF20P20 models.
According to datasheet the parameters are very close to ECW20N20/ECW20P20
If I were to design a discrete amplifier!, my dream topology would be something like this...Maybe a professional DIYer could help us out.
I have designed this topology for my TDA7293 this topology.
https://www.diyaudio.com/community/...0-lsk489-composite-feedback-amplifier.413587/
https://www.cordellaudio.com/JFETs/LSK489appnote.pdf
https://www.ti.com/lit/ds/symlink/j...=https%3A%2F%2Fwww.ti.com%2Fproduct%2FJFE2140
I have designed this topology for my TDA7293 this topology.
https://www.diyaudio.com/community/...0-lsk489-composite-feedback-amplifier.413587/
https://www.cordellaudio.com/JFETs/LSK489appnote.pdf
https://www.ti.com/lit/ds/symlink/j...=https%3A%2F%2Fwww.ti.com%2Fproduct%2FJFE2140
