How to connect the blue led ? ;-)

[Edwin Dorre]

Hi,

my Aleph-X is finished, here some pictures before all wires were connected and the lit closed...

One question; with the old Aleph the blue led is connected over the active current source. However the Aleph-X has two of them, how do you connect the led to get superior sound quality without getting the source out of balance ?







For the statistics see a previous thread!

Bye,

Edwin

[till]

stay away from those blue LEDs! they totaly kill the sound! If you want the real sound - use a 6E5 tube instead! It can also show you the accuracy of sound the amp produces at the moment - a great control instruments.

[Duo]

Yeah, definitely watch out for led's. They can be very noisy!

[Netlist]

Originally posted by Edwin Dorre
One question; with the old Aleph the blue led is connected over the active current source. However the Aleph-X has two of them, how do you connect the led to get superior sound quality without getting the source out of balance ?

Hi Edwin
Good to see you're back with your fine-looking amp.
I see some people warn you not to implement a led.
They could be right, they could be wrong.
Anyway, here's a nice thread with a lot of possible ways to connect a LED: Blue LED for BOSOZ, how to implement?
Are you still happy with the sound?
And get rid of the DC?

Greetings
/Hugo

[Panelhead]

I have gone to the simpler is better school. In my circuits I run a blue LED from each + and - rail. The LED's used are 3.5 volt and are plenty bright a 10ma.
The value resistor needed to drop each rail to 10ma is added at each end of the diode. This way there are 4 resistors used to connect two diodes. The resistors sghould help buffer the noise from the diode.
Placing one across the current source looks great, but this can add noise. The wire wrapped around the transformer looked good to me also. Then looking at my Plitron's it was more trouble than it is worth. A diode circuit and all.
BTW, Great looking amp.

George

[W.O.L.F.]

Hi Edwin,
if you need blue led, run it from 110V/230V. You need only some parts to do that....

Reinhard

[Bricolo]

Originally posted by W.O.L.F.
Hi Edwin,
if you need blue led, run it from 110V/230V. You need only some parts to do that....

Reinhard

does it introduce less noise?

[Netlist]

Why not perform a simple test:
Connect a scope at the output and look at the result with and without the LED.
This should give us an idea of the added noise.

/Hugo - will try it one of these days.

[peranders]

Originally posted by Bricolo
does it introduce less noise?

The amp itself isn't a very low noise amp.

I prefer UV LED's Nice invisible light.

BTW: Do they emitt any visible light?

BTW 2: Very nice looking amp!

[Edwin Dorre]

Hi,

thanks for all the postings... However I was only kidding about the led's !!! It was a funny way to show off my new amp pictures!!!

I just connected the blue led to one of the current sources (I do not here any audiable difference) (one led per channel)...

Edwin