I've used those same LED's (for lighting, not audio 
)
They have mounting tabs w/ holes in the corners. You simply drill and tap the heatsink, put a little thermal compound down, and screw the LED's down.
Is that all you were wondering, or do you want more technical details like watts of heat and sink size, etc?
)They have mounting tabs w/ holes in the corners. You simply drill and tap the heatsink, put a little thermal compound down, and screw the LED's down.
Is that all you were wondering, or do you want more technical details like watts of heat and sink size, etc?
These particular LED i am using are rated at 10w, and are a very bright white, if i can find the slip from when i bought them i will post a link to the seller on ebay. The blue ones sit at about 10-12v, and the red sit at about 16v. Do a search in ebay for "10w led multichip" and you should find similar chips. Mine are mounted on a heatsink from an old projection television, with a kiss of arctic silver.
They're the same ones DealExtreme sells.
you won't find much tech info, datasheets, etc. Look at Bridgelux if you want higher quality (and full tech specs in the datasheets). For playing around, though, the Chinese ones are cheap and work.
led emitter 10w - Free Shipping - DX
you won't find much tech info, datasheets, etc. Look at Bridgelux if you want higher quality (and full tech specs in the datasheets). For playing around, though, the Chinese ones are cheap and work.
led emitter 10w - Free Shipping - DX
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Hi,
I'm about to finish building my RLD amp. And I just wonder, should I worry about
RF coming in from the speaker cables? I've seen that some put a low value
capacitor to ground where the feedback loop enter the cathode circuit. To terminate the RF interference.
So should I worry ?
Sheers!
Rolf
I'm about to finish building my RLD amp. And I just wonder, should I worry about
RF coming in from the speaker cables? I've seen that some put a low value
capacitor to ground where the feedback loop enter the cathode circuit. To terminate the RF interference.
So should I worry ?
Sheers!
Rolf
I've been playing w/ big LED's again for lighting, and started thinking about their bias use here..
My question.. How do the LED's set a 'constant' anything for our tubes? I can run one of these big LED arrays at between 100ma and 2000ma. ~18 to ~30 volts. There's nothing stable or constant about the LED's themselves and they need a good current regulated supply to stop them from running away.
Just curious.. (and am planning a 6v6 build, so thinking about bias options)
My question.. How do the LED's set a 'constant' anything for our tubes? I can run one of these big LED arrays at between 100ma and 2000ma. ~18 to ~30 volts. There's nothing stable or constant about the LED's themselves and they need a good current regulated supply to stop them from running away.
Just curious.. (and am planning a 6v6 build, so thinking about bias options)
The change in voltage with respect to current (i.e., impedance) of the sorts of LEDs used here is actually not very high. I haven't tested the lighting ones yet, but a typical red LED will have 3-5 ohms of impedance at current between 5 and 25 mA. It's quite a good constant-voltage device, which is why we can get low distortion from an amp that's running in AB.
Hi Sy ,
i am newbie to the tube and i have been looking at this amp for a long time now , and i am think, i could use the output section of your amp , to drive a 100 ohm load, do you think this is possible.
If it could drive a 100 ohms, at say 12 Watts where would i make changes to the circuit, so i could achieve the end goal.
I like the constant current led thing , could i use this application on say a pre amp stage with 8 single cathodes in parallel?
Ok one last ? are these the correct led's for the constant current circuit.
HLMP-K150 - AVAGO TECHNOLOGIES - LED, 3MM, RED, 2MCD, 637NM | Farnell element14 UK
HLMP-D150 - AVAGO TECHNOLOGIES - LED, 5MM, RED, 3MCD, 637NM | Farnell element14 UK
HLMP-6000-E0011 - AVAGO TECHNOLOGIES - LED, SMD, SUBMIN, RED | Farnell element14 UK
HLMP-6000 - AVAGO TECHNOLOGIES - LED, SUBMIN, RED | CPC
cheers
skal
i am newbie to the tube and i have been looking at this amp for a long time now , and i am think, i could use the output section of your amp , to drive a 100 ohm load, do you think this is possible.
If it could drive a 100 ohms, at say 12 Watts where would i make changes to the circuit, so i could achieve the end goal.
I like the constant current led thing , could i use this application on say a pre amp stage with 8 single cathodes in parallel?
Ok one last ? are these the correct led's for the constant current circuit.
HLMP-K150 - AVAGO TECHNOLOGIES - LED, 3MM, RED, 2MCD, 637NM | Farnell element14 UK
HLMP-D150 - AVAGO TECHNOLOGIES - LED, 5MM, RED, 3MCD, 637NM | Farnell element14 UK
HLMP-6000-E0011 - AVAGO TECHNOLOGIES - LED, SMD, SUBMIN, RED | Farnell element14 UK
HLMP-6000 - AVAGO TECHNOLOGIES - LED, SUBMIN, RED | CPC
cheers
skal
The load impedance is determined by the transformer- see if you can find one with a 100 ohm (or thereabouts) secondary. Some PA transformers might work well for that if they have a 70.7V output. The turns ratio you want is sqrt(8000/100) which is about 9:1.
Just a minor clarification- the LEDs provide constant voltage, not constant current. The screen regulator is adjusted to get the desired idle current. HLMP6000 work great.
Good luck with the build- don't hesitate to ask questions along the way.
Just a minor clarification- the LEDs provide constant voltage, not constant current. The screen regulator is adjusted to get the desired idle current. HLMP6000 work great.
Good luck with the build- don't hesitate to ask questions along the way.
skal - Look to one of the British manufacturers and get a custom OPT made -
Audio Transformers Manufacturer | Custom valve transformers & Chokes
SOWTER AUDIO TRANSFORMERS
Most of these transformer are made to order anyway, so a bespoke order wouldn't be that hard. And a single secondary is easier to wind and couples much better. The NFB loop will need adjustment. (Easy)
Audio Transformers Manufacturer | Custom valve transformers & Chokes
SOWTER AUDIO TRANSFORMERS
Most of these transformer are made to order anyway, so a bespoke order wouldn't be that hard. And a single secondary is easier to wind and couples much better. The NFB loop will need adjustment. (Easy)
Hey cheers lads i think i have enough info ,to start order some bits.
The o/p tx i was looking at was a this
http://www.bluebellaudio.com/PushpullPDFs/EDB1645A.pdf
but it has a primary of 5k plate to plate and ul connection in primary ,but it also has a 70v tap which is good i think.
skal
The o/p tx i was looking at was a this
http://www.bluebellaudio.com/PushpullPDFs/EDB1645A.pdf
but it has a primary of 5k plate to plate and ul connection in primary ,but it also has a 70v tap which is good i think.
skal
Hi Sy
is the the right TIP50
TIP50 - STMICROELECTRONICS - TRANSISTOR, NPN, TO-220 | Farnell element14 UK
before i forget are 1R0 and 4R7 resistor in the led array 1/4 watt , or should i go higher say 1 watt
cheers
skal
is the the right TIP50
TIP50 - STMICROELECTRONICS - TRANSISTOR, NPN, TO-220 | Farnell element14 UK
before i forget are 1R0 and 4R7 resistor in the led array 1/4 watt , or should i go higher say 1 watt
cheers
skal