Official LYNX Power Amp builder’s thread

[masteramp]

Have you checked SOAR of all of transistors? Your PCB likes me more than Jan's PCB ( sorry JAN🙂 ) and more than my PCB

 

[tinitus]

also kept zobel + inductor away from the pcb since i like it located in the output with separate return to ground

I dont know, but is it ok to use zobel on such high power heavy duty amp

 

[east electronics]

using a zobel + inductor in an amplifier that is so much high power is a fact....

the resistor capacitor network will prevent oscilation at high frequency plus the inductor will prevent problems that will occure from long cables and the AM antena phenomenon

 

[east electronics]

this time

I think this time i outperformed my shelf i redesigned the lynx pcb to make it fit in a specific application
----- 10 outputs totaly
----- zobel is still located else where
----- and vbe will be attached with a piece of cable on one out trs
----- and of course due to cost limitations its done on a single layer pcb

havent check for any mistakes yet but for starts it looks very compact and symmetric

enjoy

 

[AndrewT]

Hi,
put the speaker output just above the left most Emitter resistor. Thicken up the trace to the left and use a 6mm 2pin male spade. This gets the feedback right next to the output.
I would prefer the Zobel to be on the PCB.

To reduce the loop area of the power leads move the two power input pads as close as possible to speaker output and PCB Power Ground pad.

 

[nek antunes]

hello 🙂
R136 and R128 to R = 0.22, connect the 60V MJL holds approximately 3.8 A, then R124 and R125 is 39R as voltage and current can be up to 45 degrees out of phase to choose a value of less than 30R
for R122 and R123 (60-15) / 0.02 = 2250R = 2K2

 

[destroyer X]

I will try to split the zobel in two parts...one to the speaker output... the back

panel output jack and another very near the output power emitters.

This way, a greek letter "P" filter will result.... will watch in the scope what happens this way.

Maybe will ressonate....because it is tune circuit.

regards,

Carlos

 

[east electronics]

uncle charly !!!! how are you ???? i am ok ...my German though is terible ( !!!!)

the idea to relocate zobel is very much related to star ground topology which is a technology that i ve seen that you dont use at least in your demo pcb

then the return to ground from the zobel is to be made with a seperate lead to starground .... not to the speaker lead ....

 

[destroyer X]

Yes, i use frame ground.

Thank you Sakis.

Carlos

 

[nek antunes]

Hello.🙂
I am with another question, the resistance R18, R19 in the list is 33R, but the scheme is 5R6?! 😕 Whats up
Now, if you connect the amp to 60V R122 and R123 is (60-15) / 0.02 = 2250 = 2K2.
If R128 to R136 is equal to 0.22R and the MJL hold 3.8A 0.22 * 3.8 = 0.836-0.6 = 0.236/0.006 = 39R.
As voltage and current can be up to 45 degrees out of phase to choose a lower value 30R.Sure!

Thank you.😀

 

[Ragnwald]

The vallue 5R6 of R118 and R119 in the schematic is incorrect, they should be 33R.

 

[pliedtka]

A question to you gurus.
Will it be possible to run the drivers, Q110 and Q111 in classA using single resistor between the emiters instead R118, 119 and lower the current. Same for predrivers Q106,107. How would this effect stability and distortions, etc

Paul

 

[tinitus]

Seems boom, schematic and assembling manual is gone 😕

 

[Jan Dupont]

It's all up here at my website;
Audio Circuit Denmark

 

[tinitus]

Ah, thanks Jan

 

[Jan Dupont]

I have moved my webhotel again and skipped Joomla pages.
Just click on "My Projects" next time 😉

 

[HMKD]

file:///E:/GYC567GYC/音响/功放/pl300.jpg

 

[planet10]

HMKD -- that points to an image on your harddrive

dave

 

[aypo]

Hello Jan, is there still a possibility of buying pcbs for lynx?
or is there anybody who would make them for some reasonable price?
thnx

 

[wendell c]

I believe they just started another run in the group buy section.