Output transistor number in design |
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fossil
Registered User Joined: 17 March 2017 Status: Offline Points: 22 |
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Posted: 23 March 2017 at 5:36pm |
Just got a cheapo Soundlab G097A which is basically as cheap as they come but inside it has 12 yes 12 NPN PNP devices (2SA940 and 2SC2073) paired up. With a spec output of just 1.5 amps each, why on earth wouldn't you just use say 1 complementary pair per channel - at a higher rating, given how cheap they are to buy ?
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patryk1305
Registered User Joined: 13 December 2012 Location: United Kingdom Status: Offline Points: 488 |
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Edit - I didn't read the question properly
Edited by patryk1305 - 24 March 2017 at 6:55am |
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Mikkel
Young Croc Joined: 17 May 2013 Location: Huddersfield Status: Offline Points: 549 |
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spreads the heat over more transistors instead of a few highly rated ones? Just a uneducated guess anyway.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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They got a deal on the smaller devices? For example, they use them as drivers on the bigger amps, so have plenty to spare. Decisions like that are always down to economics.
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Earplugs Are For Wimps!
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fossil
Registered User Joined: 17 March 2017 Status: Offline Points: 22 |
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Given how crappily cheap it is I suspect Earplugs hit it. The 2 PSU caps are 35V 3300 feeding the whole lot. When I switched it on first time one went phiz and filled the room with white smoke. Even got a pic which i'll post when i know how. Anyway, I bought it for the case as a project but before I gut it I will hook it up (change the caps first!) and listen.
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fossil
Registered User Joined: 17 March 2017 Status: Offline Points: 22 |
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fossil
Registered User Joined: 17 March 2017 Status: Offline Points: 22 |
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