Goldmund Wiki and build 2017

[Samuel Jayaraj]

Which is a reliable and relatively fair priced source for Exicon and Semilab Lateral Mosfets? I am interested in both single and double die versions.

 

[obiwankenobi]

Hello Samuel, Newark has the MOSFET's

buz900 - Search Results | Newark element14

 

[erikovsky]

Which is a reliable and relatively fair priced source for Exicon and Semilab Lateral Mosfets? I am interested in both single and double die versions.

No idea, I got plastic Exicons from a friend in China, he bought them from the distributor.

Maybe we can gather Goldmund fans to make a group buy

 

[IanAS]

ECX10N20 - Plastic Lateral Mosfet

http://www.profusionplc.com/types/lateral%20mosfet

http://uk.rs-online.com/web/c/semic...s=4294504265,4294509596,4294510397,4294964938

 

[La Mer]

nice works. Have fun always. 2SK/2SJ has different gate voltage from N/P20, be care.

 

[keantoken]

The bias voltage is designed to be about the same as the 2SK1058/J162, they are intended to be drop-in replacements. The 20N/P or 16N/P parts are dual-die so for them the bias will be doubled but still close to correct.

 

[erikovsky]

Hi,

Some questions here.
I noticed that in different model of Goldmund, there are some slight changes.

In Mimesis 29.4, there are no ZD12V+1N4148, 2* 4.7pf, while these are seen in mimesis 3/9 models.

What are their role in this circuit? Could I ignore them?

thanks

 

[keantoken]

They theoretically protect the amp from overcurrent, but many people are fine without them. The 4.7pF caps could be there for stability reasons, it could depend a lot on transistor selection whether they are needed.

 

[VinDiesel]

hi
is there anyway to make this amplifier work with vetical mosfets any mods?

 

[Nico Ras]

hi
is there anyway to make this amplifier work with vetical mosfets any mods?

No

 

[erikovsky]

Hi,

I found that it is better to build the Wiki on google sites.
Much easier to access, much similar to Wiki.

Take a look

https://sites.google.com/view/goldmund/home

Eric

 

[erikovsky]

Some more detail about DIP-24 module.

 

[Walkalone]

hi
is there anyway to make this amplifier work with vetical mosfets any mods?

Yes, you can do that.

I've tried many style output , from BJTs driving BJTs, BJTs driving Lateral MOSFET, MOSFETs driving BJTs, Lateral MOSFETs driving BJTs...etc.
And now, i'm running BJTs driving LMOS and BJT drving LMOS. They gave me best sounding.
Just remember, if using VMOS/BJT output, you must have bias circuit to avoid thermal runaway.

 

[erikovsky]

I found I am wrong. It's not DIP-24, looks like IDIP-24. Anyone knows?

 

[erikovsky]

Yes, you can do that.
Just remember, if using VMOS/BJT output, you must have bias circuit to avoid thermal runaway.

Mr. Walkalone,

I cited your words, hope you don't mind.

You said:
"Problem is the quiescent current of LTP.
Telos is 4.6mA, Mimesis 2mA."

Do you mean 2mA for single side, or fro dual side?

BTW, it would our pleasure if you could kindly share more technically details with us.

Best,

Eric

 

[Nikos]

Hi Eric good job...
2mA for dual side.

 

[erikovsky]

Hi Eric good job...
2mA for dual side.

Thank you, roger that, 2mA total for dual side.

 

[IanAS]

In Mimesis 29.4, there are no ZD12V+1N4148, 2* 4.7pf, while these are seen in mimesis 3/9 models.

They theoretically protect the amp from overcurrent

MOSFETs have a differential voltage limit for the gate, maybe 15V maybe 20V, some have an internal Zener to prevent from that being exceeded and some don't. Alfets don't.

So they are used either for protection of the MOSFET, or out of desire to limit the voltage drive and therefore limit the output current of the amplifier, maybe because the PSU is inadequate due to cost saving, or the heatsink is small due to cost saving.

 

[Walkalone]

Generally that schematics in first post exactly are the schematic of Telos. It come from clone project of a big audio forum in my country.

 

[erikovsky]

Generally that schematics in first post exactly are the schematic of Telos. It come from clone project of a big audio forum in my country.

Yes, sure. I supposed those are written in Vietnamese language. Would you kindly please translate and share some contents?