Electronics > Repair

ultrasonic cleaner MH-060S, replacing transistors [fixed > broken again]

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htm:
The PCB has a few big capacitors rated at 450V, and it has 2 big coils probably capable of generating a big current rush, so i'd rather have a sturdy component than another one that breaks down in a while.

i don't mind getting the BUV48A. Only thing is, i don't want to buy bad look-alikes. Hence my question if either brand has better reputation. (or maybe both shops only have proper brands. i don't know)

[edit:]I'll go with the TME website, because reichelt has the specs for BUV48 listed for its part BUV48A..

fzabkar:

--- Quote from: wraper on July 29, 2024, 04:52:22 pm ---Using metal can transistors in 2024 unless replacing original metal can part is quite dumb for multiple reasons.

--- End quote ---
Why?

htm:

--- Quote from: @fzabkar ---.. Its designer chose a 30-year-old transistor in a metal package ..
--- End quote ---

i don't understand. The picture i posted isn't a metal package, is it?

fzabkar:

--- Quote from: htm on July 29, 2024, 06:15:05 pm ---
--- Quote from: @fzabkar ---.. Its designer chose a 30-year-old transistor in a metal package ..
--- End quote ---

i don't understand. The picture i posted isn't a metal package, is it?

--- End quote ---

Damn, I've confused myself again. Yes, you're right. Yours is plastic. If you do decide on a metal package, make sure that the heatsink is isolated from the circuit.

fzabkar:

--- Quote from: wraper on July 29, 2024, 05:25:55 pm ---You're right. All 15A stuff in TO-220 seems to be discontinued. However you don't necessarily need 15A max either. Lower current rating would be fine as long as saturation voltage is low enough, gain at high current high enough and it's not too slow as what you should care the most about is heating not more than original.

--- End quote ---

The MH-060S cleaner is a current design, yet its designer chose a 30-year-old transistor. ISTM that s/he would know best what works in that particular application. Otherwise, why not choose from a plethora of more common, potentially cheaper transistors? :-?

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