TF11

GroupDIY Audio Forum

Help Support GroupDIY Audio Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Looks like they use a dual FET. (6 pins.)
Electronics look pretty simple.
Capsule looks at first sight like a standard capsule as made in Asia. (Although you never know...)
 
Am I the only one that's skeptical about how such mic electronics (ahem) "sound"?  ???

I mean, outside of clipping situations... How different can they really sound, really?  :eek: Obviously, discounting confirmation bias...

Spencerleehorton said:
If someone could trace the circuit im up for making one and seeing how it sounds!!
 
I might try to trace it
what can  you do with
two jfets

cascode with a cap from drain to gate to control the gain like a 8x

Phantom C, gain stage to SF

or?
 
looks like
1 x polyproperlene 470pf
2 x film caps (blue) ?
1 x red resistor?
7 x metal film resistors that could be 1.1k?, 2 x 5k, 10M, 700k?, 2.1k, 7.7k?
2 x electrolytic caps?
1 x dual jFET transistor
1 x 2.2uf 50v electrolytic cap
1 x 5k trimmer
1 x OEP txf (2:1?)
1 x edge terminated single side capsule

i think i got at least one resistor right!!!!
 
Spencerleehorton said:
looks like
1 x polyproperlene 470pf
2 x film caps (blue) ?
1 x red resistor?
7 x metal film resistors that could be 1.1k?, 2 x 5k, 10M, 700k?, 2.1k, 7.7k?
2 x electrolytic caps?
1 x dual jFET transistor
1 x 2.2uf 50v electrolytic cap
1 x 5k trimmer
1 x OEP txf (2:1?)
1 x edge terminated single side capsule

i think i got at least one resistor right!!!!
This sounds like there could be hidden some smd-parts on the track side.....
 
Pretty sure I could make a few of them for cheaper than €1000!!!
Those single edge terminated capsules are only about £30 ish, components I probably have all of them and have plenty of spare bodies which are similar!!
Sounds like a good alternative to the c414 for a bit more fuller frequency sound.
 
Unless the red resistor is a 1G one the circuit can use some kind of bootstrapping to increase the input impedance, something like here:

https://sound-au.com/articles/fet-f4a.gif
https://sound-au.com/articles/fet-applications.htm
 
Good source for LSK489, two fets in 6pin package:
https://store.nacsemi.com/products/detail?part=LSK489-TO-71&stock=LIS000000001244
 
dirty1_1garry said:
Good source for LSK489, two fets in 6pin package:
https://store.nacsemi.com/products/detail?part=LSK489-TO-71&stock=LIS000000001244
Micross.com -> buy online, select linear systems, search for lsk
 
RuudNL said:
Looks like they use a dual FET. (6 pins.)
Electronics look pretty simple.
Capsule looks at first sight like a standard capsule as made in Asia. (Although you never know...)
I would say that complete mic looks like Asia made. Especially the body and capsule. But I still like their Logo  ;)
 
trying to work out the resistors and it looks like the following:
15k or 12M (brown,green,black,red,brown)
18M (brown,green,black,grey,brown)
1.82k (brown, brown, red, grey, brown)
2.67k (red,blue,purple,brown,brown)
100k (brown,black,black,orange,brown)
1G (brown,black,black,purple,yellow,black)
2.2k (red,red,black,brown,brown)

whats your thoughts?
 
Looking at the picture from the Amazon link right now..
top site left from cap:
Purple, red, black, brown, brown

top site right from cap:
Brown, green, black, red, brown
Brown green, blue, orange, brown
Brown, orange , red, Grey, brown

Bottom site right from cap:
Red, green, purple, brown, brown
Brown, blue, black, orange, brown
Brown, blue, black, yellow, blue

 
Back
Top