Is that OK, now if you house is 30C not 20C then you will use a bigger heatsink or run at a ower power, I have also allowed for a -+20V rail just in case.
So if you want 4Ohm at 24.99W you will need 0.3C/W and at 20C ambient it will be 62C thus at 30C it will 72C, to hot. and it static load will be 140W/ch.
Thanks James. I'm pleased to see they're 10-30 watts. I had assumed they were fixed at 10 watts. This allows me to try more power into my H2's compared to my Oto.
From Steve , who had to listen to the new Kits on Sunday.
"DIY SECA Kit
I recently had the opportunity to hear the best sounding 'computer case' I've come across..!
I'm not a reviewer so bear with me if my analogies are a bit wayward, but I'm trying to find ways to express a 'sense' through words. I should add that the time spent was more of a listen than a test or review and connected components were only a 10+ year old DVD player as source (!), bog standard IEC power cables and cheap mid-sized stand-mount speakers. I'll surmise my thoughts based on existing experience (neither vast nor exotic) - They're musical, fast, detailed, pure and textured.
From cold, the opening track through the SECAs began with a thrum across acoustic guitar that was open with an in-the-room'ness quality…
With acoustic, ambient/electronic and voice the overriding sense is that the SECAs are VERY open, detailed and light of touch, music seems almost as if carried on air.
The sound is just 'there' and 'pure' rather than other amps that seem to almost push music down a tube, constraining and colouring it. I think the SECAs may be what some would call 'natural' sounding (ie. they don't really add anything).
Sound no longer came from (within) the speakers but more like a bloom of sound that surrounded or escaped their confines and filled the space around with an effortless delivery."
Ta mate. Im out the next couple of nights, so will be friday,sat.
It might be I have been up all night completing SECA Pre, it now sounds OK. HP is lovely loud and clear, might have to reduce its power I think 2 W is silly.
How are you screwing the transistors to the copper plate? Have you countersunk the back of the copper plate so the screw heads are flush with the back of the copper plate allowing the copper plate to sit flush with the heat sink?
Comments
http://pages.ebay.com/link/?nav=item.view&alt=web&id=290425055612
What were you trying to do?
Thanks.
Edit: posts now deleted. I don't think there's anything with information lost.
Took the day off work, and drilled some holes !
:x
Washing up........hhmm....better get that done before the boss get in !
Nearly there. Hope it works
A thing of beauty.
Its tiny (for a SECA anyway ! ).......can't wait to get it up and running.
Ta mate. Im out the next couple of nights, so will be friday,sat.
I made sure they lined up with the vents in the heatsink so i could tap right through.
Transistors m3 tap in the copper and a few mil into the back plate.
We have lift off !.......well the left channel anyway