Hello Tyimo, I'm back from my vacation now. I've had pcb's made for BOSEWA/Aleph L 1.2 , but I haven't had time to actually build/test it.
As I am in the process of moving to another apartment/giving it a serious makeover I have very little time left for anything else. Looks like it's going to be like this for at least a couple of months
As I am in the process of moving to another apartment/giving it a serious makeover I have very little time left for anything else. Looks like it's going to be like this for at least a couple of months
Hi Mads!
I know this situation from end of the last year and I wish you the bests!
Only one theoretical question: how could I calculate the output power for the choke loaded SEWA (or better to say OTA)??
I would like to use:
120mH 0.5R EI core Choke
+24V supply
8R load
I only know: 24V/8R=3A bias
and on 20Hz the choke has 15ohm resistance.
Greets:
Tyimo
I know this situation from end of the last year and I wish you the bests!
Only one theoretical question: how could I calculate the output power for the choke loaded SEWA (or better to say OTA)??
I would like to use:
120mH 0.5R EI core Choke
+24V supply
8R load
I only know: 24V/8R=3A bias
and on 20Hz the choke has 15ohm resistance.
Greets:
Tyimo
6C45-PE
This tube will run at 24V and drive a low impeadence.
http://digilander.libero.it/paeng/6c45_pe_low_power.htm
This may be the tube for SEWA, just received all the parts to start my SEWA and have a few 6C45 tubes in my parts bin, this may be my next project
after my bathroom remodling is complete
This tube will run at 24V and drive a low impeadence.
http://digilander.libero.it/paeng/6c45_pe_low_power.htm
This may be the tube for SEWA, just received all the parts to start my SEWA and have a few 6C45 tubes in my parts bin, this may be my next project
after my bathroom remodling is complete
Re: Re: Sewa and z=15 Ohm?
I have transformers with 30VAC secondaries, from zen v.1. This would give me 34V after Pi filter. Is that too much?
What I shuld change to get 1.5A bias? Can you suggest exact values? I hope I don't ask too much
Thanks!
Mad_K said:
In that case you should use 24VAC transformer for 30VDC+ rails. You can also lower the bias to 1,5A
I have transformers with 30VAC secondaries, from zen v.1. This would give me 34V after Pi filter. Is that too much?
What I shuld change to get 1.5A bias? Can you suggest exact values? I hope I don't ask too much
Thanks!
Re: Re: Re: Sewa and z=15 Ohm?
34V is nice. Bias is defined by the 0,6VBE from CCS transistor divided by the CCS Source resistor(s)
ticovski said:
I have transformers with 30VAC secondaries, from zen v.1. This would give me 34V after Pi filter. Is that too much?
What I shuld change to get 1.5A bias? Can you suggest exact values? I hope I don't ask too much
Thanks!
34V is nice. Bias is defined by the 0,6VBE from CCS transistor divided by the CCS Source resistor(s)
I have thought of using SEWA to drive a RIBBON in a triamped 3-way system
The loss of gain in Sewa is maybe compensated by higher efficiency of the ribbon
Any comments on that ?
Hard to explain - but how much higher efficiency is needed from a midrange driven with SEWA - to align with a woofer driven with amp with normal gain ?
The loss of gain in Sewa is maybe compensated by higher efficiency of the ribbon
Any comments on that ?
Hard to explain - but how much higher efficiency is needed from a midrange driven with SEWA - to align with a woofer driven with amp with normal gain ?
Ryssen said:Is it possible to use a trimpot to set the current trough the amp,I mean if I use rather small heatsinks.Where could I use the pot?
Bias is set by the value of R12-16. If you can find a 1 ohm 3W multiturn pot, you can insert it there and have adjustable bias
Another option would be to use a switch to short out some resistors.- Status
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