Under load, i.e. when you draw 1.5A current per rail, the voltage will drop by 2V minimum (depending of the stiffness of your transformers and the capacity of the capacitors).
When mounting Permaneder's PCB does anyone use a shoulder washer (C) or other type of insulator to prevent the mounting screw (A) from touching the heatsink?
Regards,
Dan 🙂
When mounting Permaneder's PCB does anyone use a shoulder washer (C) or other type of insulator to prevent the mounting screw (A) from touching the heatsink?
Regards,
Dan 🙂
Better use small cut-to-length silicon hoses to prevent contact between the mounting screws and the L profiles.
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see difference ........ as P sez - use silicon hosen for 3mm screws
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Could someone who build this amp with permaneder PCB describe his heatsink ?
A Hifi2000 4U heatsink (165mmx300mmx40mm ) is OK for 2 vfets and 2 mosfets ? (may be 5U ?)
A Hifi2000 4U heatsink (165mmx300mmx40mm ) is OK for 2 vfets and 2 mosfets ? (may be 5U ?)
regarding HiFi2000 cases ......
4U , 400mm deep is exactly enough for 100W per side
5U , 400mm deep is comfortable for 100W per side
I often use these (SK 479, Standard extruded heatsinks, Heatsinks f.cool, Fischer Elektronik), 400mm wide, 200mm high. At more than 100W dissipation they run pretty hot, when the ambient temperature climbs up to 30°C or more, however.
Since I have to order some parts from Digikey I'll probably get some of these.
Nylon Spacers
Perfect fit and cost almost nothing. 😀
Regards,
Dan
Check the sizes, they are probably too big.
permaneder, what are those hoses diameters for transistor legs and mounting bolts?
permaneder, what are those hoses diameters for transistor legs and mounting bolts?
if you use those 3,2/4,7mm , you need to drill 5mm dia holes in L profile
I made few Babelfish amps in 4U/400 and 5U/400 cases ......... what I said was experienced exactly during summer days , no air conditioning .....
Babelfish J2 , pair of them , for Denmark ……. (Blast from the Past) | Zen Mod Blog
What's everyone using for bridge rectifiers? I'd like to use the venerable MUR860's but I'm guessing they're to small?
Regards,
Dan 🙂
Regards,
Dan 🙂
I made few Babelfish amps in 4U/400 and 5U/400 cases ......... what I said was experienced exactly during summer days , no air conditioning .....
I had a look at the HiFi 2000 cases. They do have better Rth than my Fischer SK 479 and seem to fit well, thus 🙂
I had a look at the HiFi 2000 cases. They do have better Rth than my Fischer SK 479 and seem to fit well, thus 🙂
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