L'Amp: A simple SIT Amp

[vdi_nenna]

Lamp is driving full range speaker from 125hz to 20khz.
F5 is driving below 125hz. The active crossover is before the lamp and F5.

I've seen what you proposed in F3, to split freq like 1st order slope?
Is that what you mean?

I'm using generic 10k uF electrolytic at Lamp output.
Just want to know if anyone can share their experience with bypassing
that output cap with higher quality film caps.
I think I read paper in oil caps are not good for bypassing.
True?

Thx

Vin

 

[Zen Mod]

true ............ ?

as with vine - you are only one entitled to judge verity

so - if you bypass elco with film - keep it if you like it
if you prefer big solid cap instead , use that

in your boots , I would try to put some motor run caps there ,instead of elco

say , 3x 70 (80)uF will do the job

on our side of big splash , Icar Italy is manufacturer to seek for , while on your side ....... dunno - most probably GE

 

[Dirk1]

Hello,
I wanted finally to L `amp build, unfortunately I get the 2SK82N no longer the only dealer that appears to me in the Google search is circutdiy. Maybe someone has yet another source for me.

translated with google.

 

[Michael Rothacher]

Acronman ( CircuitDIY Affortable Components for Hobbyists ) is the best source I'm aware of.

 

[Nelson Pass]

Acronman ( CircuitDIY Affortable Components for Hobbyists ) is the best source I'm aware of.

The only reliable source I am aware of. Highly recommended.

 

[bonzo15011978]

The only reliable source I am aware of. Highly recommended.

They also sell on ebay, where I bought 4 SITs.
5 stars seller IMHO.

 

[Dirk1]

On ebay and circuitdiy no 2SK82 are to get N, I'm still waiting for 2-3 weeks then I'll buy two pairs of P + N channel and try the p-channel re-sell.

 

[Michael Rothacher]

Oops, I see the KD-33's are unavailable or out of stock.

There are plenty of interesting uses for the P's, and you could certainly build a P-channel version of L'Amp. Or, send them to me .

 

[Dirk1]

Thank you mr. Rothacher is unfortunately the KE-33, because I would have bought almost the wrong. Can I still take another sit as an alternative. Do you have to change at a P-channel L 'amp much?

 

[Michael Rothacher]

Any of them can be made to work. It is a question of where the bias voltage will need to be to achieve the proper idle current. With an adequate adjustable voltage source for bias, this shouldn't be a problem.

If you build a version with P-channels, all the polarities get flipped.

 

[Dirk1]

Have I understood you correctly at a P channel? As Appendix I once made ​​a drawing.

 

[Dirk1]

L - My Photo Gallery

 

[Michael Rothacher]

I don't see anything.

 

[Zen Mod]

me neither , even from other side

 

[Dirk1]

above my L - My Photo Gallery click, then I can at any rate see the wiring diagram. My first attempt to put images purely went wrong.
Dirk

 

[Zen Mod]

not good

main PSU is floating , power wise

 

[Michael Rothacher]

For P-Channel, the Drain would be connected to the negative terminal of the supply (through the load). The source would be grounded as would the positive terminal of the supply. The bias will need to be positive with respect to the source, so you may wish to use a positive regulator IC there. Note the polarity of the output cap as well.

 

[Dirk1]

Hi Zen Mod, could you please tell me where the error in my PSU is.

 

[Zen Mod]

something like this

edit - one of these

btw. nF sized caps , as PSU reservoir ones and output , are somewhat smallish

 

[Dirk1]

Thank you Zen Mod, if I can not I build more N-channel amp with the L'P - Canal to your proposal.