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Old 17th September 2011, 11:51 AM   #1
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Default transistor mounting technique ? Heatsink

Well..... there are 2 ways (at least what i know) of attaching transistor, which need heatsink. (i) Direct solder to pcb (ii) mounted on heatsink, connect to PCB through wire

So, skip the advantages and difference. What is their separate precaution need to be taken, especially heatsink mounted ?
What i know is that the wire connect to PCB need to be as short as possible, but how long is permissible ? (well.. limits)

Could i twist the 3 terminal of wire together, or crossing ? (like this finger) Or should i place as far as possible ?

Does getting a conductive material wrap around the wires will help ? (minimize distortion by electromagnetic radiation)
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Old 17th September 2011, 12:01 PM   #2
Mooly is offline Mooly  United Kingdom
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Leads to output devices should be as short as possible. To not do so is asking for trouble with unwanted oscillation and stability problems.

If you must use wire then keep it all separate and no shielding.
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Old 17th September 2011, 12:12 PM   #3
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what is the typical length when you say short ? is 5cm long ? or better not to use this method ?
Well.... I haven't got my heatsink, so i don't know how i'm going to attached to it, using wire(more flexible) also seems to make the amp prone to unstability, any other method i could use, and also provide me the flexibility of choosing heatsink ?
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Old 17th September 2011, 12:16 PM   #4
Mooly is offline Mooly  United Kingdom
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If it's for the amp in your other thread then you will probably be OK as the design of that amp lends itself to being a stable design. 5cm isn't too bad but make it as short as possible.
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Old 17th September 2011, 12:26 PM   #5
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yeah yeah, its for DX Trust, uncle carlos' amp (aka. Destoryer)
Guess i will leave it until i have the heatsink in hand.
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