LYNX Power Amp PCB Group Buy interest

[chalo]

sorry, i could not open the BOM before as my pdf didn´t work.

Though are those drivers good?

Thanks, and regards!

[tinitus]

My trafos are measured unloaded at 2x38Vac(2kwatt) fore output and 2x43Vac fore input...hope thats ok

[Jan Dupont]

chalo;

jan.

Can I use 2sc4793/2sa1837 in place of mje´s, as long as
2sc5200/2sa1943 for the output?

And what other options of opamp would work here?
opa 2134?

with the rails voltage you suggested what is the expected output?

Regarding other transistors please check pin layout, Wattage and SOA (please understand that my time is limited and that I can't check parameters for all who want's to use other devices).

Pin layout for both the drivers and output devices are: B C E

The 42VDC version provides app. 200W into 4 Ohms and 100 into 8 Ohms.
For the 50VDC version the numbers are 135W/8 and 270/4.
Vp^2/(2*RL) e.g. = 40^2/(2x8) = 100 Wrms

[Jan Dupont]

tinitus

My trafos are measured unloaded at 2x38Vac(2kwatt) fore output and 2x43Vac fore input...hope thats ok

If you intend to benefit from the 2kwatt output trafo you need to ad many extra pairs of output devices and use 1 Ohm speakers

Your trafos gives you app. 54VDC for the input section and 60VDC for the output section. Normally you would use higher Voltage for the input section (VAS) than for the output stage to compensate for the Vbe loss (3x0.7V) in the predrivers/drivers/output devices.
Note that your output could never be higher than the Voltage at your VAS stage (54VDC minus some losses).



Forgot: Your trafos can do the job

[tinitus]

Originally posted by ACD
tinitus

Your trafos gives you app. 54VDC for the input section and 60VDC for the output section. Normally you would use higher Voltage for the input section (VAS) than for the output stage to compensate for the Vbe loss (3x0.7V) in the predrivers/drivers/output devices.

Forgot: Your trafos can do the job

I think you might have misunderstood, and reversed data, or I may not have been very clear...it is actually like you suggest, 60VDC fore input and 54VDC fore output...so its all fine I guess

[jimmy.e]

I would be interested in 10 boards.

Iam pretty new to this board, so i cant pm u my information. Iam mailing it instead.

[Jan Dupont]

tinitus

[ANTHONY2181]

Hi Jan,

I added 4 boards to the Wikki.

Regards

Anthony

[lesherons]

Jan - Typically what bias level do you use with the Lynx? I am interested in using several boards for a home theater system and want something which is not a room heater. There are all sorts of very good class A designs, but they are not attractive in this sort of application. Also have you tried using an inexpensive op amp such as a TL071 or an NE5532 in place of the OPA device? Regards, HK

[lesherons]

Jan - I should have written 5534 and not 5532. Regards, HK