I'm thinking about building some Aleph 5 monoblocks using the kk-pcb boards. (I gather that, since these are clearly labeled as clones, they are all right to use.) My question is really a general one: How can I decide how much heatsink I need? I have read the various threads I could find about this, and I take it that I need to know how much power is going through the output devices. Then, if I understand correctly, I can do something like: R = 30 / POWER, where POWER is the total amount of power being dissipated; R will then be the rating I need on the heatsink. So how can I figure out how much power is being dissipated?
For what it's worth, I'm also building an Aleph J and have found some cool-looking heatsinks on the web that would make a very cool case.... So the same question arises there.
Sorry if this is a silly question, but I'm much better at building these things than I am at understanding how they work. I'm a philosopher, not an engineer....
For what it's worth, I'm also building an Aleph J and have found some cool-looking heatsinks on the web that would make a very cool case.... So the same question arises there.
Sorry if this is a silly question, but I'm much better at building these things than I am at understanding how they work. I'm a philosopher, not an engineer....
nothing better than proper and exact example - take a look at Modushop 4U/300 case and see that as minimum heatsinking per channel
Thanks. I'm really trying to understand the principle here. But to give a precise example, suppose I want to build (as I may well) amps from the Aleph 5 boards here. Is what I need to decide how much bias power (334V times current) is flowing through each transistor? How do I get that number? (Other than looking at the service manual, which says that the bias current is 'slightly greater than two amps').
Actually, reading the service manual a bit, maybe what I really need to do is understand how the Aleph constant current source works. I'll look that up.
Then, I guess, there's the question of heatsinks for the current source MOSFETs, but I'd be happy enough to understand the principle on the output transistors.
Actually, reading the service manual a bit, maybe what I really need to do is understand how the Aleph constant current source works. I'll look that up.
Then, I guess, there's the question of heatsinks for the current source MOSFETs, but I'd be happy enough to understand the principle on the output transistors.
Here is a good introduction. For class A, the power dissipated in Watts (per device) is the
DC voltage drop (in Volts) across the device times the DC current (in Amps) through the device.
ESP - Heatsink design and transistor mounting
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don't speak in arbitrary examples
say which amp you're interested in ( according to your room/speakers), then we will help you to understand how to compute dissipation per channel for exact amplifier, then we will tell you which Modushop case is good for exact amp, then you can either buy one, or search for cheaper/more affordable/custom solution
Beside the problem of calculating the dissipation/power per device, there’s the overall temperature transmission problem...
The sound-au arricle is great and tellis it all, there’s another one, focused on chip-amps, here, which also goes quite deep: neurochrome‘s „taming the lm3886“, here:
Taming the LM3886 Chip Amplifier: Thermal Design – Neurochrome
But as mighty ZM says, it’s the heatsink [emoji847]
The sound-au arricle is great and tellis it all, there’s another one, focused on chip-amps, here, which also goes quite deep: neurochrome‘s „taming the lm3886“, here:
Taming the LM3886 Chip Amplifier: Thermal Design – Neurochrome
But as mighty ZM says, it’s the heatsink [emoji847]